With A Common Signal Processing Stage Patents (Class 455/84)
  • Patent number: 7454176
    Abstract: The present invention provides a semiconductor integrated circuit for communication (RF IC) operable in a mode for receiving a received signal subjected to phase modulation and amplitude modulation and a mode for receiving a received signal subjected only to phase modulation. In the semiconductor integrated circuit for communication, a frequency band of a loop filter in a PLL circuit is switched and set so as to become large in a reception mode and become small in a transmission mode.
    Type: Grant
    Filed: February 24, 2006
    Date of Patent: November 18, 2008
    Assignee: Renesas Technology Corp.
    Inventors: Toshiya Uozumi, Ikuya Ono, Jiro Shinbo
  • Publication number: 20080274706
    Abstract: An embodiment of the present invention provides a radio frequency (RF) transceiver, comprising a transmitter, a receiver, an antenna connected to the transmitter and the receiver via a tuner, a power detector adapted to acquire information about transmit power, and wherein the tuner tunes the antenna based upon the transmit information to optimize the antenna in both the receive and transmit bands.
    Type: Application
    Filed: May 1, 2007
    Publication date: November 6, 2008
    Inventor: Guillaume Blin
  • Patent number: 7444167
    Abstract: The present invention discloses a dual-band RF transceiver. The transceiver comprises a first module, used as the RF front-end of the dual-band transceiver and used for receiving and transmitting a first RF signal and a second RF signal; a second module, electrically connected to the first module, used as the IF IQ modulator/demodulator of the dual-band RF transceiver; a third module, electrically connected to the first and the second modules, used as the tripe-band phase-locked frequency synthesizer of the dual-band RF transceiver and used for providing a first local oscillating signal and a second local oscillating signal to the first module, and a third local oscillating signal to the second module. The dual-band RF transceiver according to the present invention realizes the dual-band triple-mode operation of IEEE802.11 a/b/g by a single dual-band RF module, and therefore the circuit size, power dissipation, component count, and cost can be dramatically reduced.
    Type: Grant
    Filed: June 10, 2005
    Date of Patent: October 28, 2008
    Assignees: Integrated System Solution Corp.
    Inventors: Sheng-Fuh Chang, Wen-Lin Chen, Cheng-Hua Tsai, Chin-Hung Chien, Hung-Cheng Chen, Shu-Fen Tang, Albert Chen
  • Publication number: 20080232279
    Abstract: Aspects of a method and system for sharing filters between transmit and receive paths in an integrated FM radio are provided. In this regard, a FM radio receive processing path and a FM radio transmit processing path may each be configured to share a filter. Accordingly, one or more switching elements may enable coupling/decoupling the filter to/from the FM radio transmit and FM radio receive processing paths. Furthermore, the switching elements may be programmatically controlled by a processor and/or memory. Additionally, by coupling the filter to the transmit receive paths during alternating time intervals, aspects of the invention may enable simulating simultaneous transmission and reception of FM radio signals utilizing while sharing one or more filters. In various embodiments of the invention, separate filters may be utilized for an in-phase processing path and a quadrature phase processing path.
    Type: Application
    Filed: November 9, 2007
    Publication date: September 25, 2008
    Inventor: Bojko Marholev
  • Patent number: 7421250
    Abstract: A radio frequency (RF) integrated circuit (IC) includes a local oscillation module, analog radio receiver, analog radio transmitter, digital receiver module, digital transmitter module, and digital optimization module. The local oscillation module is operably coupled to produce at least one local oscillation. The analog radio receiver is operably coupled to directly convert inbound RF signals into inbound low intermediate frequency signals based on the local oscillation. The digital receiver module is operably coupled to process the inbound low IF signals in accordance with one of a plurality of radio transceiving standards to produce inbound data. The digital transmitter is operably coupled to produce an outbound low intermediate frequency signal by processing outbound data in accordance with the one of the plurality of radio transceiving standards. The analog radio transmitter is operably coupled to directly convert the outbound low IF signals into outbound RF signals based on the local oscillation.
    Type: Grant
    Filed: September 9, 2005
    Date of Patent: September 2, 2008
    Assignee: Broadcom Corporation
    Inventor: Hong Shi
  • Patent number: 7400690
    Abstract: The present invention is directed to an adaptive phase controller employing a threshold level and a method of controlling a phase. In one embodiment, the adaptive phase controller includes a comparator configured to receive a comparison signal representing a phase and to provide a vernier signal based on comparing first and second samples of the comparison signal when the comparison signal is below the threshold level. Additionally, the adaptive phase controller also includes an adder/decoder coupled to the comparator and configured to adjust a current number corresponding to the phase based on the vernier signal.
    Type: Grant
    Filed: October 14, 2003
    Date of Patent: July 15, 2008
    Assignee: Agere Systems Inc.
    Inventors: Yanling Sun, Xiao-Jiao Tao
  • Patent number: 7398104
    Abstract: A mobile phone with wireless camera detection. A mobile phone converts the frequency band of a received signal to mobile signal frequency band (for example GSM, DSC or PCS) with added mixer, oscillator, and filter. The converted signal is treated as a mobile signal prior to processing in the base band processor. Detected signal strength is checked to determine whether a wireless camera is currently present.
    Type: Grant
    Filed: May 17, 2005
    Date of Patent: July 8, 2008
    Assignee: Qisda Corporation
    Inventor: Hai-Tao Yang
  • Patent number: 7369816
    Abstract: A radio transceiver includes circuitry that enables received RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a temperature sensing module that produces accurate voltage level readings that may be mapped into corresponding temperature values. A processor, among other actions, adjusts gain level settings based upon detected temperature values. One aspect of the present invention further includes repetitively inverting voltage signals across a pair of semiconductor devices being used as temperature sensors to remove a common mode signal to produce an actual temperature-voltage curve. In one embodiment of the invention, the circuitry further includes a pair of amplifiers to facilitate setting a slope of the voltage-temperature curve.
    Type: Grant
    Filed: August 6, 2004
    Date of Patent: May 6, 2008
    Assignee: Broadcom Corporation
    Inventors: Michael Steven Kappes, Arya Reza Behzad
  • Publication number: 20080102764
    Abstract: A signal of interest (SOI) may be selected from among a plurality of cochannel signals based on one or more internal or external structural feature/s of the SOI, e.g., automatically selected based on any one or more internal or external structural features of the SOI that is known a priori. Examples of such internal structural features include, but are not limited to, number, frequency and/or absolute or relative signal strength (signal to noise ratio) of one or more transmitted signal components (e.g., pilot tones, squelch tones, etc.) present in the SOI; absence of a signal component at a given frequency in the SOI (i.e., present as a “dead spot” at a given frequency within the SOI); signal strength versus frequency profile of the SOI, signal strength versus time domain profile of the SOI, transient characteristics, time versus frequency profile, etc.
    Type: Application
    Filed: October 30, 2006
    Publication date: May 1, 2008
    Inventors: Steven D. Thornton, Ross A. McClain, Benjamin A. Collins
  • Patent number: 7359678
    Abstract: The invention provides a signal processing semiconductor integrated circuit of the direct conversion system, which includes a dummy amplifier having the same circuit configuration as a low noise amplifier being the first stage amplifier, in which the DC offset calibrations on the subsequent stage amplifiers are carried out during shifting into the reception mode in a state that the low noise amplifier is deactivated and the dummy amplifier is activated. Thereby, the invention achieves to suppress generation of the DC offsets resulting from the leakage noises of the local oscillator during shifting into the reception mode, and to enhance the reception sensitivity.
    Type: Grant
    Filed: April 22, 2005
    Date of Patent: April 15, 2008
    Assignees: Renesas Technology Corp., Hitachi ULSI Systems Co., Ltd.
    Inventors: Norio Hayashi, Noriyoshi Hagino, Toshiki Matsui, Kazuo Watanabe, Satoshi Tanaka
  • Patent number: 7349672
    Abstract: A digital signal transceiver includes a frequency modulator for outputting a high-frequency signal frequency-modulated with a digital signal input thereto, a power amplifier, an antenna terminal, and an antenna switch. The antenna switch includes a first branch port for receiving a signal output from the power amplifier, a common port connected to the antenna terminal, said common port being connected to the first branch port in the transmitting mode, and a second branch port connected to the common port in the receiving mode. The transceiver further includes a filter having an input port thereof connected to the second branch port of the antenna switch, a high-frequency amplifier having an input port thereof connected to an output port of the filter, and a mixer for mixing a signal output from the high-frequency amplifier with the signal output from the frequency modulator.
    Type: Grant
    Filed: February 19, 2004
    Date of Patent: March 25, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masaaki Noda, Osamu Asayama, Hiroshi Ando, Hideaki Ueda, Mitsuru Kaito
  • Patent number: 7349674
    Abstract: A receiver is protected by reducing a transmit leakage signal leaked when a transmit signal is radiated through the antenna by using three circulators (transmitter, antenna, and receiver). The transmitter and antenna circulators output the transmit leakage signal to be reduced to less than the transmit signal through a first leakage path. The transmitter and receiver circulators output the transmit leakage signal through a third leakage path and reduce the signal. The transmit leakage signals received through the first and third leakage paths are canceled, and that received through a second leakage path is output to a receiver. The transmit leakage signal has a 40 dB signal reduction compared to the transmit signal, and is transmitted to the receiver.
    Type: Grant
    Filed: December 30, 2004
    Date of Patent: March 25, 2008
    Assignees: Electronics and Telecommunications Research Institute, Samsung Electronics Co., Ltd., SK Telecom Co., Ltd., KT Corporation, KTFreetel Co., Ltd., Hanaro Telecom, Inc.
    Inventors: Jae-Ho Jung, Joon-Hyung Kim, Kwang-Chun Lee
  • Patent number: 7349678
    Abstract: A circuit arrangement for transmitting and receiving radio signals includes an amplification device with an output for transmitting signals, an input for receiving signals and a supply line, and an antenna for transmitting and receiving signals. The antenna is connected to the output of the amplification device. The output of the amplification device is an input for signals received via the antenna, and the supply line is an output for received signals that are converted to the supply line by the amplification device.
    Type: Grant
    Filed: February 20, 2004
    Date of Patent: March 25, 2008
    Assignee: Infineon Technologies AG
    Inventor: Anton Salfelner
  • Patent number: 7324789
    Abstract: A frequency synthesizer for use in a transceiver generates a relatively high reference frequency with fine frequency resolution and low in-band phase noise by using a digital processor to generate a digital reference signal at a finely-tuned reference frequency. A Digital-to-Analog Converter (DAC) converts the digital reference signal to an analog reference signal, and a low pass filter filters the analog reference signal to produce a filtered analog reference signal. The frequency synthesizer further includes a phase locked loop for up-converting the filtered analog reference signal from an IF signal to an RF signal.
    Type: Grant
    Filed: January 20, 2005
    Date of Patent: January 29, 2008
    Assignee: Broadcom Corporation
    Inventor: Henrik T. Jensen
  • Patent number: 7324791
    Abstract: A low-noise differential bias circuit is provided which obtains excellent noise characteristics while ensuring excellent distortion characteristics. A collector of a transistor Q11 is connected to a voltage supply point (Vcc) via a resistor R15. A base of the transistor Q11 is connected to a base of a transistor Q1 via resistors R13, R11 connected in series. A connection point between the resistors R11, R13 is connected to the collector of the transistor Q11. A collector of a transistor Q12 is connected to the voltage supply point at connection point A via a resistor R16. A base of the transistor Q12 is connected to a base of a transistor Q2 via resistors R14, R12 connected in series. A connection point between the resistors R12, R14 is connected to the collector of the transistor Q12. By this configuration, a high frequency ground is performed at the connection point A.
    Type: Grant
    Filed: January 21, 2005
    Date of Patent: January 29, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Toshifumi Nakatani, Shinichi Osako, Jyunji Itoh
  • Publication number: 20070293163
    Abstract: Transmitter architectures designed to accommodate both constant and non-constant of envelope modulation schemes and capable of providing local oscillator carrier frequencies within any one of numerous desired frequency bands, thus allowing compliance with many different communication standards. One example of a programmable frequency synthesizer includes a plurality of transmitter components and a microcontroller coupled to the frequency synthesizer and to the plurality of transmitter components. The microcontroller is adapted to provide a frequency control signal to the frequency synthesizer to control a frequency of the local oscillator carrier frequency.
    Type: Application
    Filed: June 15, 2006
    Publication date: December 20, 2007
    Inventors: John Kilpatrick, Joel Dawson, Jose Bohorquez, Jeff Venuti
  • Publication number: 20070293162
    Abstract: A method of providing assistance for synchronization of a radio link in a communications network comprising at least a first network element, the method comprising the steps: making a decision to connect a user equipment to the first network element via a first radio link to transmit a signal discontinuously thereto; transmitting the signal continuously from the user equipment to the first network element via the first radio link; synchronizing the first radio link; and switching the user equipment to transmit the signal discontinuously after the first radio link is synchronized.
    Type: Application
    Filed: June 20, 2006
    Publication date: December 20, 2007
    Inventors: Jussi Jaatinen, Karri Rantaaho
  • Publication number: 20070243834
    Abstract: An oscillation controlling apparatus for controlling an oscillation frequency of an oscillation circuit to be a target frequency comprises a variable range dividing unit configured to dividing a variable range of a control signal into a plurality of portions, the control signal increasing or decreasing the oscillation frequency of the oscillation circuit as a value thereof is increased or decreased; and a determining unit configured to determining the portion including the control signal setting the oscillation frequency to the target frequency, by outputting the control signal at a boundary of each portion divided by the variable range dividing unit and by acquiring the oscillation frequency of the oscillation circuit, wherein the variable range dividing unit is configured to divide repeatedly the variable range until the oscillation frequency of the oscillation circuit is set to the target frequency with using the portion determined by the determining unit as the variable range.
    Type: Application
    Filed: April 12, 2007
    Publication date: October 18, 2007
    Applicant: Sanyo Electric Co., Ltd.
    Inventor: Youji Takei
  • Patent number: 7260363
    Abstract: A universal power amplifier for amplifying and filtering transmit and receive signals has an input switch for switching transmit and receive signals. Transmit paths in the universal power amplifier are connected to the input switch. The transmit paths comprise filters for filtering the transmit signals and amplifiers for amplifying the transmit signals. Receive paths are connected to the input switch. The receive paths filter and amplify the receive signals. A first receive path shares one of the filters a first transmit path to filter a receive signal. A power output stage is connected to the transmit paths for amplifying the transmit signals into high-power transmit signals. A transmit/receive switch is connected to the power output stage and the receive paths for switching the high-power transmit signals and receive signals to an antenna.
    Type: Grant
    Filed: June 19, 2003
    Date of Patent: August 21, 2007
    Assignee: Rockwell Collins, Inc.
    Inventor: Timothy E. Snodgrass
  • Patent number: 7257380
    Abstract: An integrated multimode radio includes a multimode receiver and a multimode transmitter. The multimode receiver includes a shared receiver front-end, a receiver multiplexor, and a plurality of receiver IF stages. The multimode transmitter includes a shared transmitter front-end, a transmitter multiplexor, and a plurality of transmitter IF stages.
    Type: Grant
    Filed: September 9, 2005
    Date of Patent: August 14, 2007
    Assignee: Broadcom Corporation
    Inventors: Hooman Darabi, Brima Ibrahim, Ahmadreza Rofougaran
  • Patent number: 7242916
    Abstract: The invention provides a communication semiconductor integrated circuit device (RF IC) capable of pulling in the frequency of a PLL circuit to a desired set frequency at high speed even in the case where a frequency settable range of the PLL circuit is wide without providing a current source other than a current source for charging and discharging in an normal operation. An oscillator as a component of a PLL circuit is constructed so as to be operative in a plurality of bands. In a state where a control voltage of the oscillator is fixed to a predetermined value, an oscillation frequency of the oscillator is measured in each of bands and stored in a storing circuit. A set value for designating a band supplied at the time of PLL operation is compared with the stored measured frequency value. From a result of comparison, a band to be actually used in the oscillator is determined, and a frequency difference between the maximum frequency of the selected band and the set frequency is obtained.
    Type: Grant
    Filed: September 12, 2006
    Date of Patent: July 10, 2007
    Assignee: Renesas Technology Corp.
    Inventors: Hirotaka Oosawa, Masumi Kasahara, Noriyuki Kurakami, Toshiya Uozumi
  • Patent number: 7236750
    Abstract: Techniques to correct for phase and amplitude mismatches in a radio device in order to maintain channel symmetry when communicating with another device using MIMO radio communication techniques. Correction for the amplitude and phase mismatches among the plurality of transmitters and plurality of receivers of a device may be made at baseband using digital logic (such as in the modem) in the receiver path, the transmitter path or both paths of that device. In a device, amplitude and phase offsets are determined among the plurality of radio transmitter and radio receiver paths by measuring phase and amplitude responses when supplying a signal to a transmitter in a first antenna path of the device and coupling the radio signal from a first antenna to a second antenna path of that device where the signal is downconverted by a receiver associated with the second antenna path, and similarly coupling a signal from the second antenna path to the first antenna path.
    Type: Grant
    Filed: June 2, 2004
    Date of Patent: June 26, 2007
    Assignee: IPR Licensing Inc.
    Inventors: Chandra Vaidyanathan, Gary L. Sugar
  • Patent number: 7228110
    Abstract: A high frequency device includes a transmission/reception amplifier 13 that amplifies and outputs an input signal, and a transmission/reception switch 2 that gang switches internally so that during transmission an input of the transmission/reception amplifier 13 is connected to an up mixer and an output of the transmission/reception amplifier 13 is connected to an antenna unit 5, and so that during reception the output of the transmission/reception amplifier 13 is connected to a down mixer and the input of the transmission/reception amplifier 13 is connected to the antenna unit 5.
    Type: Grant
    Filed: October 3, 2003
    Date of Patent: June 5, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Yorito Ota
  • Patent number: 7203465
    Abstract: A receiver/transmitter circuit includes an antenna terminal, a transmitter circuit which outputs a transmission signal in response to a transmit control signal, a receiver circuit which receives a reception signal from the antenna terminal, and a waveform control circuit. The waveform control circuit outputs a switching signal having a gradual logic transition in response to the transmit control signal. The receiver/transmitter circuit further includes a first switch connected between the antenna terminal and the transmitter circuit, and a second switch connected between the antenna terminal and the receiver circuit. The first switch transfers the transmission signal to the antenna terminal in response to the switching signal.
    Type: Grant
    Filed: October 9, 2003
    Date of Patent: April 10, 2007
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Takashi Kuramochi
  • Patent number: 7200365
    Abstract: The invention provides a composite high frequency component constituting a part of a microwave circuit having plural signal paths corresponding to their respective frequencies, comprising: a diplexer for coupling transmitting signals from the plural signal paths for transmission and distributing receiving signals into said plural signal paths for reception; plural high frequency switches for separating the plural signal paths into a transmission section and a reception section, respectively; plural filters introduced in the signal paths; said diplexer, said high frequency switch, and said filters being integrated into a ceramic multi-layer substrate formed by lamination of plural ceramic sheet layers. According to the above described composite high frequency component, the diplexer, the high frequency switches, and the filters which constitute the composite high frequency component are integrated into the ceramic multi-layer substrate formed by lamination of plural ceramic sheet layers.
    Type: Grant
    Filed: May 20, 2003
    Date of Patent: April 3, 2007
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Takahiro Watanabe, Koji Tanaka, Koji Furutani, Hideki Muto, Takanori Uejima, Norio Nakajima
  • Patent number: 7196638
    Abstract: An embedded digitization system enables a military platform to receive, transmit and process a variety of types of information for a variety of purposes. An apparatus and method provides a means to ensure information interoperability between the invention and external sources. The invention provides a development environment that enables a developer to automatically and interactively develop the middleware services and functions that contain the aspects for interoperability with external sources. The invention ensures interoperability through reuse of functions and services known to satisfy requirements for interoperability. When functions and services that satisfy requirements for interoperability are not available, the invention provides a means to develop new functions and services that satisfy requirements for interoperability.
    Type: Grant
    Filed: July 15, 2004
    Date of Patent: March 27, 2007
    Assignee: Honeywell International, Inc.
    Inventor: Anthony Edward Sabatino
  • Patent number: 7197284
    Abstract: The present invention provides a transceiver circuit that includes a transmission amplifier coupled with an antenna input/output node. The transmission amplifier is configured to amplify communications to be transmitted from the transceiver circuit. The transceiver circuit further includes a receiver and a field effect transistor. The receiver includes a receiver input coupled with the antenna input/output node. The field effect transistor is coupled between the receiver input and an electrical reference. The field effect transistor is configured to provide an open circuit when communications are received at the receiver input and to provide a closed circuit when communications are not being received at the receiver input.
    Type: Grant
    Filed: April 25, 2003
    Date of Patent: March 27, 2007
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Per-Olof Brandt, Jesper Olsander
  • Patent number: 7177662
    Abstract: A multimode wireless communication includes a digital baseband processing module, an analog to digital converter module, a digital to analog converter module, a first radio section, and a second radio section. The digital baseband processing module is operably coupled to convert outbound data into outbound digital baseband signals and to convert inbound digital baseband signals into inbound data. The analog to digital converter module is operably coupled to convert inbound analog baseband signals into the inbound digital baseband signals. The digital to analog converter module is operably coupled to convert the outbound digital baseband signals into outbound analog baseband signals. The first radio section is operably coupled to convert the outbound analog baseband signals into first outbound radio frequency (RF) signals and to convert first inbound RF signals into the inbound analog baseband signals when the wireless communication device is in a first mode of operation.
    Type: Grant
    Filed: April 2, 2004
    Date of Patent: February 13, 2007
    Assignee: Broadcom Corporation
    Inventors: Jason A. Trachewsky, Alan Corry, Venkat Kodavati
  • Patent number: 7174144
    Abstract: Calibration of a phase locked loop and applications thereof within a radio frequency integrated circuit begins by determining an intersection of an up current and down current produced by a charge pump within the phase locked loop. The RFIC then determines a reference voltage corresponding to the intersection, which varies from an ideal voltage of VDD/2 based on process variations. The RFIC then offsets a control voltage to the voltage control oscillator (VCO) of the phase locked loop based on the reference voltage. Accordingly, by determining the offset of the actual intersection from the ideal intersection, the control voltage to the VCO may be adjusted thereby calibrating the phase locked loop for more linear performance.
    Type: Grant
    Filed: September 13, 2002
    Date of Patent: February 6, 2007
    Assignee: Broadcom Corporation
    Inventor: Tsung-Hsien Lin
  • Patent number: 7164651
    Abstract: A wireless computer data network includes several untethered mobile units that make ad-hoc data connections with an Internet-connected base station using the IEEE-802.11a standard. Each unit includes a radio transceiver fully integrated on a single semiconductor chip. The receiver portion is a double-conversion superheterodyne type, and shares the same intermediate and local oscillator frequencies with a two-stage up-conversion transmitter. Two on-chip synthesizers that each include a voltage-controlled oscillator and phase-locked loop can be operated independently for each conversion stage, or operated in offset mode. External reference frequencies can be injected for voltage-controlled oscillator and phase-locked loop testing, chip characterization, and automatic compensation modeling. Each mobile and base unit can be outfitted with transmit/receive antenna transfer switches, RF-power amplifiers, and low-noise receiver amplifiers to increase operating range.
    Type: Grant
    Filed: April 25, 2006
    Date of Patent: January 16, 2007
    Assignee: Cisco Systems Wireless Networking (Australia) Pty Limited
    Inventors: Neil Weste, Andrew Adams, Philip Ryan, John O'Sullivan, David J. Skellern, Richard Keaney
  • Patent number: 7158762
    Abstract: A single chip radio transceiver includes circuitry that enables received RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning the LO frequency with the frequency of the received RF signals, received signal strength indicators for adjusting frontal and rear amplification stages accordingly, and, finally, filtering circuitry to filter high and low frequency interfering signals, including DC offset.
    Type: Grant
    Filed: January 10, 2003
    Date of Patent: January 2, 2007
    Assignee: Broadcom Corporation
    Inventors: Zhongming Shi, Ahmadreza Rofougaran, Arya Behzad
  • Patent number: 7155179
    Abstract: A full-duplex transceiver using a method immunizing itself against self-jamming. The transceiver includes a receiver and a transmitter. The receiver includes a frequency immunization converter and a high pass IF filter. The transmitter transmits a TX signal. The receiver receives an RX signal and simultaneously receives a portion of the power of the TX signal as an undesired TX jamming signal. The frequency immunization converter uses the center frequency of the TX signal for downconverting the RX signal to an IF signal and simultaneously downconverting the TX jamming signal to near zero frequency. The high pass IF filter passes the IF signal and blocks the signal at near zero frequency. As a consequence of the downconversion using the TX frequency, a second LO frequency is controlled for avoiding image frequencies.
    Type: Grant
    Filed: July 16, 2001
    Date of Patent: December 26, 2006
    Assignee: Texas Instruments Incorporated
    Inventor: Bret Rothenberg
  • Patent number: 7155236
    Abstract: Techniques for efficient signaling to and from a plurality of mobile stations are disclosed. In one embodiment, a subset of mobile stations may be allocated a portion of the shared resource with one or more individual access grants, another subset may be allocated a portion of the shared resource with a single common grant, and yet another subset may be allowed to use a portion of the shared resource without any grant. In another embodiment, an acknowledge and continue command is used to extend all or a subset of the previous grants without the need for additional requests and grants, and their associated overhead. In one embodiment, a traffic to pilot ratio (T/P) is used to allocate a portion of the shared resource, allowing a mobile station flexibility in selecting its transmission format based on T/P.
    Type: Grant
    Filed: August 21, 2003
    Date of Patent: December 26, 2006
    Assignee: Qualcomm Incorporated
    Inventors: Tao Chen, Edward G. Tiedemann, Jr., Avinash Jain
  • Patent number: 7146143
    Abstract: The invention provides a communication semiconductor integrated circuit device (RF IC) capable of pulling in the frequency of a PLL circuit to a desired set frequency at high speed even in the case where a frequency settable range of the PLL circuit is wide without providing a current source other than a current source for charging and discharging in an normal operation. An oscillator as a component of a PLL circuit is constructed so as to be operative in a plurality of bands. In a state where a control voltage of the oscillator is fixed to a predetermined value, an oscillation frequency of the oscillator is measured in each of bands and stored in a storing circuit. A set value for designating a band supplied at the time of PLL operation is compared with the stored measured frequency value. From a result of comparison, a band to be actually used in the oscillator is determined, and a frequency difference between the maximum frequency of the selected band and the set frequency is obtained.
    Type: Grant
    Filed: April 16, 2003
    Date of Patent: December 5, 2006
    Assignee: Renesas Technology Corp.
    Inventors: Hirotaka Oosawa, Masumi Kasahara, Noriyuki Kurakami, Toshiya Uozumi
  • Patent number: 7139540
    Abstract: An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged for integration into a single IC including components such as filters and inductors. The controller for adaptive programming and calibration of the receiver, transmitter and LO generator. The self-testing unit generates is used to determine the gain, frequency characteristics, selectivity, noise floor, and distortion behavior of the receiver, transmitter and LO generator. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.
    Type: Grant
    Filed: April 15, 2005
    Date of Patent: November 21, 2006
    Assignee: Broadcom Corporation
    Inventors: Stephen Wu, Hung-Ming Chien (Ed Chien), Brima Ibrahim, Ahmadreza Rofougaran, Meng-An Pan
  • Patent number: 7133641
    Abstract: A wireless communication RF circuit includes a transmitting-and-receiving antenna, a modulator circuit, an SPST switching circuit, and a demodulator circuit, which are arranged in a sequence. Upon signal reception, the SPST switching circuit is switched ON, and the demodulator circuit extracts a signal wave from a signal received by the antenna and outputs the signal wave to a control circuit. Upon signal transmission, the SPST switching circuit is switched OFF, and the modulator circuit mixes transmission data supplied from the control circuit with a carrier and outputs the carrier to the antenna. Only a single antenna is required. Upon signal reception, the influence of the modulator circuit is negligible. Upon signal transmission, the SPST switching circuit is switched OFF, thus the effect of the demodulator circuit is negligible, which greatly reduces loss.
    Type: Grant
    Filed: April 23, 2003
    Date of Patent: November 7, 2006
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Tsutomi Ieki, Yoshihiro Yamaguchi
  • Patent number: 7113744
    Abstract: An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged for integration into a single IC including components such as filters and inductors. The controller for adaptive programming and calibration of the receiver, transmitter and LO generator. The self-testing unit generates is used to determine the gain, frequency characteristics, selectivity, noise floor, and distortion behavior of the receiver, transmitter and LO generator. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.
    Type: Grant
    Filed: October 18, 2000
    Date of Patent: September 26, 2006
    Assignee: Broadcom Corporation
    Inventors: Shervin Moloudi, Maryam Rofougaran
  • Patent number: 7095985
    Abstract: Radio transceiver, in particular, a mobile telephone having a transmitter output stage, a receiver part, a transmission/reception antenna which is assigned jointly to the transmitter output stage and the receiver part, a transmission band-transmitting filter and a reception band-transmitting filter, having a compensation element, connected between the output of the transmitter output stage and the input of the receiver part, for compensating crosstalk of a transmission signal element onto the receiver part.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: August 22, 2006
    Assignee: Siemens Aktiengesellschaft
    Inventor: Ludwig Hofmann
  • Patent number: 7088983
    Abstract: A chip-on-chip-structure semiconductor device for a radio communication device, having a base band chip and a high-frequency chip piled up on and bonded to the surface thereof. The base band chip has a low-frequency signal processing unit for processing a signal in a first frequency band. The high-frequency chip has a high-frequency signal processing unit for processing a signal in a second frequency band of which frequency is higher than that of the first frequency band.
    Type: Grant
    Filed: September 5, 2003
    Date of Patent: August 8, 2006
    Assignee: Rohm Co., Ltd.
    Inventors: Junichi Hikita, Hiroo Mochida, Katsutoshi Nagi
  • Patent number: 7079815
    Abstract: A transceiver having a transmit/receive switch. The transmit/receive switch includes: a common port adapted for coupling to an antenna element; a transmit port; a receive port and a matched port. The transceiver includes a second switch. The second switch has: a common port adapted for coupling to an input/output port through a gain/phase control unit; a transmit port; a receive port and a matched port. The transceiver includes a balanced amplifier. The balanced amplifier includes a pair of input ports. A first one of the pair of input ports is coupled to receive port of the transmit/receive switch, and a second one of the pair of input ports is coupled to the transmit port of the second switch. The balanced amplifier includes a pair of output ports. A first one of the pair of output ports is coupled to the transmit port of the transmit/receive switch and a second one of the pair of ports is coupled to the receive port of the second switch.
    Type: Grant
    Filed: May 20, 2003
    Date of Patent: July 18, 2006
    Assignee: Raytheon Company
    Inventors: Jerome H. Pozgay, Christopher P. McCarroll
  • Patent number: 7076217
    Abstract: A radio transceiver comprises a reception path, a transmission path, and a frequency generator with a programmable phase lock loop. The reception path, the transmission path, and the frequency generator share a maximum amount of common circuitry to facilitate implementation of the entire radio transceiver on a single integrated circuit. The reception path includes an amplifier and a quadrature mixer for producing low intermediate frequency signals. The transmission path can be controlled by either a modulated voltage controlled transmitter or an in-phase and quadrature modulator transmitter.
    Type: Grant
    Filed: November 22, 2000
    Date of Patent: July 11, 2006
    Assignee: Micro Linear Corporation
    Inventors: Gwilym Francis Luff, Jerry Loraine
  • Patent number: 7065328
    Abstract: An AM receiver incorporates an antenna, a transistor, a current source, and a power supply. The antenna is connected to a gate electrode of the transistor and through a link to a signal earth. In operation, the antenna receives radiation and generates a corresponding input signal which propagates to the gate electrode. The transistor is operable to process the input signal in two steps, namely to reflectively amplify the input signal to generate a correspondingly reflectively amplified input signal at the gate electrode in a first step, and amplitude demodulate the amplified input signal in a second step. The transistor is operable in a non-linear region of its current/voltage characteristic whereas it simultaneously provides reflective amplification and signal demodulation, namely the two steps occur simultaneously.
    Type: Grant
    Filed: June 1, 2000
    Date of Patent: June 20, 2006
    Inventors: Ian J Forster, Adrian N Farr
  • Patent number: 7061855
    Abstract: A wireless computer data network includes several untethered mobile units that make ad-hoc data connections with an Internet-connected base station using the IEEE-802.11a standard. Each unit includes a radio transceiver fully integrated on a single semiconductor chip. The receiver portion is a double-conversion superheterodyne type, and shares the same intermediate and local oscillator frequencies with a two-stage up-conversion transmitter. Two on-chip synthesizers that each include a voltage-controlled oscillator and phase-locked loop can be operated independently for each conversion stage, or operated in offset mode. External reference frequencies can be injected for voltage-controlled oscillator and phase-locked loop testing, chip characterization, and automatic compensation modeling. Each mobile and base unit can be outfitted with transmit/receive antenna transfer switches, RF-power amplifiers, and low-noise receiver amplifiers to increase operating range.
    Type: Grant
    Filed: June 27, 2005
    Date of Patent: June 13, 2006
    Assignee: Cisco Systems Wireless Networking (Australia) Pty Limited
    Inventors: Neil Weste, Andrew Adams, Philip Ryan, John O'Sullivan, David J. Skellern, Richard Keaney
  • Patent number: 7058383
    Abstract: A signal interfacing technique for connecting signals between a signal processing device and a radio integrated circuit (IC) involving multiplexing two or more signals on a connection pin between the radio IC and a signal processing device. According to one technique, transmit and receive signals are multiplexed such that during a transmit mode a transmit signal is coupled on the connection pin from the signal processing device to the radio IC, and during a receive mode a receive signal is coupled from the radio IC on the connection pin to the signal processing device. According to another technique, in-phase (I) and quadrature (Q) signals are multiplexed on a connection pin during both transmit and receive modes.
    Type: Grant
    Filed: December 15, 2003
    Date of Patent: June 6, 2006
    Assignee: IPR Licensing, Inc.
    Inventors: Gary L. Sugar, Robert M. Masucci, Michael F. Toner
  • Patent number: 7050765
    Abstract: A lightweight millimeter wave outdoor unit includes a lightweight housing with a heat sink and mounting member configured for mounting on the antenna to form a wireless link. A millimeter wave transceiver board is formed of ceramic material and mounted within the housing. It includes a millimeter wave transceiver circuit that has microwave monolithic integrated circuit (MMIC) chips and operable with the transmit and receive boards. An intermediate frequency (IF) board has components forming an intermediate frequency circuit operable with the millimeter wave transceiver circuit. A frequency synthesizer board has a signal generating circuit for generating local oscillator signals to the transceiver circuit. A controller board has surface mounted DC and low frequency discrete devices thereon forming power and control circuits that supply respective power and control signals to other circuits on other boards.
    Type: Grant
    Filed: January 8, 2003
    Date of Patent: May 23, 2006
    Assignee: Xytrans, Inc.
    Inventors: Danny F. Ammar, David Bass, Gavin Clark, Ronald D. Graham, Conrad Jordan, Stephen A. Stahly
  • Patent number: 7043201
    Abstract: Only a first radio station is equipped with a local oscillation signal source. A signal transmitted to a second radio station includes local oscilaation signal components used to up-convert a modulated intermediate frequency band signal in addition to intermediate frequency band signal components. The second radio station that receives the signal from the first radio station extracts and regenerate the local oscillation signal used at the first radio station using a local oscillation signal regenerator. The extracted and regenerated local oscillation signal is used to down-convert modulated radio signal components to the intermediate frequency band and simultaneously up-convert to the radio frequency band the modulated intermediate frequency band signal to be transmitted to the first radio station.
    Type: Grant
    Filed: June 21, 2001
    Date of Patent: May 9, 2006
    Assignee: Communications Research Laboratory, Independent Administrative Institution
    Inventors: Yozo Shoji, Kiyoshi Hamaguchi, Hiroyo Ogawa
  • Patent number: 7031669
    Abstract: Techniques to correct for phase and amplitude mismatches in a radio device in order to maintain channel symmetry when communicating with another device using MIMO radio communication techniques. Correction for the amplitude and phase mismatches among the plurality of transmitters and plurality of receivers of a device may be made at baseband using digital logic (such as in the modem) in the receiver path, the transmitter path or both paths of that device. In a device, amplitude and phase offsets are determined among the plurality of radio transmitter and radio receiver paths by measuring phase and amplitude responses when supplying a signal to a transmitter in a first antenna path of the device and coupling the radio signal from a first antenna to a second antenna path of that device where the signal is downconverted by a receiver associated with the second antenna path, and similarly coupling a signal from the second antenna path to the first antenna path.
    Type: Grant
    Filed: June 9, 2003
    Date of Patent: April 18, 2006
    Assignee: Cognio, Inc.
    Inventors: Chandra Vaidyanathan, Gary L. Sugar
  • Patent number: 7031761
    Abstract: A two part cellular radio telephone in which a separable part is charged from a cellular transceiver portion.
    Type: Grant
    Filed: September 4, 2003
    Date of Patent: April 18, 2006
    Assignee: Vertu Limited
    Inventors: Lisa Hunt, Simon Furmidge, Mark Hutchison, Peter Ashall, Nigel Cridland
  • Patent number: 7031668
    Abstract: An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged for integration into a single IC including components such as filters and inductors. The controller for adaptive programming and calibration of the receiver, transmitter and LO generator. The self-testing unit generates is used to determine the gain, frequency characteristics, selectivity, noise floor, and distortion behavior of the receiver, transmitter and LO generator. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.
    Type: Grant
    Filed: June 7, 2002
    Date of Patent: April 18, 2006
    Assignee: Broadcom Corporation
    Inventors: Hooman Darabi, Ahmadreza Rofougaran, Maryam Rofougaran
  • Patent number: 7016695
    Abstract: The invention is directed to an apparatus, method and system for providing reduced power consumption, fast processing of digitized communication signals and relatively easy reconfiguration for different applications, such as communication protocols/standards. The invention recognizes that the processing of signals associated with different types of communication standards can be recharacterized as deterministic data flows. Also, for each deterministic data flow, several of the same categories of computation are performed in substantially the same manner, albeit in a different order or somewhat differently, that is unique to a particular application. Based on this recharacterization, the invention divides the processing of the deterministic data flow for a communication signal among several Class processors that are separately configurable to optimize their particular category/class of computation in the processing of the signal.
    Type: Grant
    Filed: December 11, 2002
    Date of Patent: March 21, 2006
    Assignee: National Semiconductor Corporation
    Inventor: Ahmad Bahai