Single Antenna Switched Between Transmitter And Receiver Patents (Class 455/83)
  • Publication number: 20120309329
    Abstract: The present disclosure discloses a device for four-frequency transceiving of a Global System for Mobile Communication (GSM), comprising a Power Amplifier (PA), a radio frequency transceiving chip, a baseband control chip, an antenna switch, a GSM low frequency filter and a GSM high frequency filter. The antenna switch receives a control signal transmitted from the baseband control chip, and the antenna switch connects to a corresponding line according to the control signal, and transmits signals between the antenna and the connected line; the GSM low frequency filter receives the signals of a first frequency band or a second frequency band which are transmitted by the antenna switch, and passes the signals of the first frequency band or the second frequency band; the GSM high frequency filter receives the signals of a third frequency band or a fourth frequency band which are transmitted by the antenna switch, and passes the signals of the third frequency band and the fourth frequency band.
    Type: Application
    Filed: September 19, 2010
    Publication date: December 6, 2012
    Applicant: ZTE CORPORATION
    Inventors: Wenqing He, Juan Yu, Hu Ge
  • Patent number: 8326236
    Abstract: A configurable transceiver includes an RF receiver section that generates at least one downconverted signal from a received RF signal. A receiver processing module processes at least one downconverted signal in a plurality of receiver stages to produce a stream of inbound data, wherein the receiver processing module is configurable in response to a control signal to selectively bypass at least one of the plurality of receiver processing stages. A transmitter processing module processes outbound data in a plurality of transmitter stages to produce at least one baseband signal, wherein the receiver processing module is configurable in response to the control signal to selectively bypass at least one of the plurality of transmitter processing stages. An RF transmitter section generates at least one RF signal from the at least one baseband signal.
    Type: Grant
    Filed: November 29, 2011
    Date of Patent: December 4, 2012
    Assignee: Broadcom Corporation
    Inventor: Ahmadreza (Reza) Rofougaran
  • Patent number: 8326235
    Abstract: There is provided a communication device including: a first node connected to an antenna; a transmission unit outputting a signal to the antenna via the first node; a reception unit having a signal input thereto from the antenna via the first node; a first switch provided between the first node and the transmission unit; and a second switch provided between the first node and the reception unit, and in which the second switch is alternately turned on and off repeatedly, and the reception unit includes an amplifier amplifying a signal that the transmission unit outputs via the first and second switches and a mixer mixing a signal amplified in the amplifier and a local signal.
    Type: Grant
    Filed: July 16, 2010
    Date of Patent: December 4, 2012
    Assignee: Fujitsu Limited
    Inventor: Masaru Sato
  • Patent number: 8325632
    Abstract: A front end circuit for coupling a plurality of antennas to a multi-channel time domain duplex RF transceiver is disclosed. The front end circuit has a first transmit port, a first receive chain primary port, a first receive chain secondary ports, and a first antenna port connectible to a first one of the plurality of antennas. The front end circuit also has a second transmit port, a second receive chain primary port, and a second receive chain secondary port connectible to a second one of the plurality of antennas. A first switch has terminals connected to the first transmit port, the first receive chain primary port, and the second receive chain secondary port, as well as a common terminal that is connected to the first antenna port. Additionally, the front end circuit has a second switch that has terminals connected to the second transmit port, the second receive chain primary port and the first receive chain secondary port, and a common terminal connected to the second antenna port.
    Type: Grant
    Filed: July 7, 2009
    Date of Patent: December 4, 2012
    Assignee: RFaxis, Inc.
    Inventor: Oleksandr Gorbachov
  • Patent number: 8320842
    Abstract: An apparatus includes a tunable diplexer; first, second and third radio nodes; and path selection circuitry. The tunable diplexer includes a dedicated port, at least a first signal port and a second signal port, and control inputs configured to change at least one of frequency characteristics and phase characteristics of the tunable diplexer. The path selection circuitry is configurable to select between a first signal pathway between the third radio node and the first signal port and a second signal pathway between the third radio node and the second signal port. The tunable diplexer may have control signals inputs to select between the first and second signal pathways based on an expected interference scenario between radio signals at the first and second signal ports, and the control signals may change frequency characteristics and/or phase characteristics of at least one of the signal ports based on an operational condition of the apparatus.
    Type: Grant
    Filed: May 19, 2008
    Date of Patent: November 27, 2012
    Assignee: Nokia Corporation
    Inventors: Seppo O. Rousu, Marko E. Leinonen, Juha P. Valtanen
  • Publication number: 20120295559
    Abstract: A transceiver includes a first circuit having a connector for connection to an antenna and receiving circuitry, and a second circuit having transmitting circuitry. The first and second circuits are coupled using a balun, where the balun is arranged so that its unbalanced side is in the first circuit and its balanced side is in the second circuit.
    Type: Application
    Filed: November 17, 2011
    Publication date: November 22, 2012
    Applicant: CAMBRIDGE SILICON RADIO LIMITED
    Inventors: Terence Chi-Fung Kwok, Timothy Newton, Simon Chang
  • Patent number: 8315577
    Abstract: A multiband high-frequency circuit comprising a first switch SPDT1 for switching the connections of a multiband antenna to transmitting circuits 11bg-T, 11a-T and receiving circuits 11bg-R, 11a-R of first and second communications systems, and a transmitting/receiving circuit BLT-TR of a third communications system, a diplexer circuit Dip1 for branching a high-frequency signal to 11a-R and 11bg-R or BLT-TR and a diplexer circuit Dip2 for branching a high-frequency signal to 11bg-T and 11a-T, both of which are disposed downstream of SPDT1, each diplexer circuit Dip1, Dip2 comprising a lower-frequency-side filter and a high-frequency-side filter, a bandpass filter BPF1 being disposed downstream of the lower-frequency-side filter of the diplexer circuit Dip1, and a second switch SPDT2 being disposed downstream of the bandpass filter BPF1.
    Type: Grant
    Filed: December 29, 2010
    Date of Patent: November 20, 2012
    Assignee: Hitachi Metals, Ltd.
    Inventors: Shigeru Kemmochi, Kazuhiro Hagiwara, Keisuke Fukamachi, Mitsuhiro Watanabe
  • Publication number: 20120289173
    Abstract: Disclosed herein is an interface of a multi chip module transmitting and receiving data among a plurality of chips. An interface of a multi chip module includes a communication unit that is provided in the chips and transmits and receives the data; and a radio communication unit that is provided outside the chips, converts the data transmitted from the communication unit into radio signals and wirelessly transmits the radio signals, and demodulates radio signals received from other chips into data and transmits the data to the communication unit, whereby wired communication chips can implement radio communication.
    Type: Application
    Filed: April 11, 2012
    Publication date: November 15, 2012
    Inventors: Kyoung Ho Lee, Su Bong Jang, Dong Hwan Lee, Hee Soo Yoon
  • Patent number: 8311477
    Abstract: According to one embodiment of the present invention, there is provided a high-frequency switching circuit including a first differential line and third line. The differential line includes a first line configured to have one end and an other end, a second line configured to have one end and an other end and a first switch configured to switch electrical connection between the one ends of the first and second lines. The differential line receives or outputs differential signals by the other ends of the first and second lines. The third line is configured to be electromagnetically coupled with the first differential line when the first switch is turned on. The first switch is arranged at a position where an electrical length from the other end of the first line and an electrical length from the other end of the second line are approximately equal.
    Type: Grant
    Filed: February 28, 2011
    Date of Patent: November 13, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tong Wang, Toshiya Mitomo
  • Patent number: 8301084
    Abstract: A front end circuit for coupling an antenna to a radio frequency (RF) transceiver for time domain duplex systems is disclosed. The front end circuit includes an antenna port, a power amplifier, a low noise amplifier, and a matching network. The output of the power amplifier and the input of the low noise amplifier are coupled to the matching network and connected in common to the antenna. The power amplifier and the low noise amplifier are activated and deactivated in sequence corresponding to the transmit and receive modes of the transceiver, and the matching network minimizes the effect that one has on the other at the designated operating frequency.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: October 30, 2012
    Assignee: Rfaxis, Inc.
    Inventor: Oleksandr Gorbachov
  • Patent number: 8295784
    Abstract: A semiconductor switching device includes, on one semiconductor substrate: a switching circuit configured to switch connection states between a plurality of terminals; a negative voltage generating circuit; and a control circuit connected to the switching circuit and the negative voltage generating circuit and configured to supply a control signal to the switching circuit, the control circuit including: a level shift circuit with a low-potential power supply terminal connected to the negative voltage generating circuit and an output node connected to the switching circuit, the level shift circuit being configured to supply a negative potential signal as a control signal at a low level to the switching circuit; a diode with its anode connected to the output node of the level shift circuit; and a transistor with its drain-source path connected between the cathode of the diode and ground, the drain-source path switching from a blocking state to a conducting state before the potential of the output node of the le
    Type: Grant
    Filed: July 14, 2008
    Date of Patent: October 23, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Toshiki Seshita
  • Patent number: 8285224
    Abstract: A transmitter/receiver for radio communication according to an embodiment of the present invention has: a transmission circuit for generating a transmission signal; a demodulation circuit for demodulating a receive signal; an antenna circuit for transmitting the transmission signal from the transmission circuit and receiving the receive signal and guiding the receive signal to the demodulation circuit; a phase shift circuit which is connected between the transmission circuit and the antenna circuit; and a switching circuit which switches between outputting a superimposed signal of the transmission signal and the receive signal between the phase shift circuit and the antenna circuit to the demodulation circuit, and outputting a superimposed signal of the transmission signal and the receive signal between the transmission circuit and the phase shift circuit to the demodulation circuit.
    Type: Grant
    Filed: July 17, 2008
    Date of Patent: October 9, 2012
    Assignee: TDK Corporation
    Inventors: Ryoichi Kondo, Shinichirou Mochizuki
  • Patent number: 8285217
    Abstract: A circulator-enabled signals suppressor (CENSOR) for reducing co-site interference comprising: a first circulator comprising first, second, and third ports, wherein the first port is disposed to receive an incoming signal from an antenna, wherein the incoming signal comprises a desired signal and an interference signal; a first reflective, tunable bandpass filter-bank operatively coupled to the second port, disposed to reflect a reflected signal back into the second port and also to produce a filtered signal, wherein the reflected signal comprises the desired signal and a reflected portion of the interference signal, and the filtered signal comprises a majority portion of the interference signal; and a receiver operatively coupled to the third port and disposed to receive the reflected signal.
    Type: Grant
    Filed: February 16, 2010
    Date of Patent: October 9, 2012
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: John W. Rockway, Karl Moeller, Jeffrey L. Young
  • Patent number: 8285214
    Abstract: The present invention relates to an adjustable circuit for filtering a transmission channel of an RFID signal and for suppressing a carrier signal in the reception path between an input gate and an output gate, including at least one adjustable oscillator for generating an oscillator signal, at least one input mixing stage cooperating with the oscillator for mixing an input signal by means of the oscillator signal to an intermediate frequency and a blocking device arranged downstream of the input mixing stage or the input mixing stages for suppressing the carrier signal at the intermediate frequency.
    Type: Grant
    Filed: March 9, 2009
    Date of Patent: October 9, 2012
    Assignee: Pepperl + Fuchs GmbH
    Inventors: Arash Sadeghfam, Holger Heuermann
  • Publication number: 20120252377
    Abstract: In a high frequency antenna switch module, an I/O interface generates various control signals for controlling a switch module on the basis of a system data signal and a system clock, a decoder generates a switch control signal SWCNT for controlling a switch in response to a control signal CNT in the control signals, a timing detector for switch-ports switching generates a switch-port switching detection signal t_sw in response to the switch control signal, a frequency control signal generator generates frequency control signals ICONT and CCONT in response to the signal t_sw, and a negative voltage generation circuit generates a negative voltage output signal NVG_OUT while switching the frequency of the clock signal generated in the negative voltage generation circuit to different frequencies in response to signals ICONT and CCONT. The switch switches the paths among the plural switch ports in response to the signals SWCNT and NVG_OUT.
    Type: Application
    Filed: March 1, 2012
    Publication date: October 4, 2012
    Inventors: Yusuke Wachi, Takashi Kawamoto, Yuta Sugiyama
  • Patent number: 8280316
    Abstract: In a wireless transmitting/receiving device of TDD system etc., a transmission signal is detected on the transmitting side in a specified transmission period, a signal reflected from an antenna through a circulator is detected on the receiving side in the transmission period and a reception signal is detected on the receiving side in a specified reception period. In this case, in a part of the transmission period a transmission signal having been detected on the transmitting side is selected while in the remaining part of the transmission period a reflection signal having been detected on the receiving side through a circulator from an antenna is selected, and in the reception period a reception signal having been detected on the receiving side through the circulator from the antenna is selected and outputted.
    Type: Grant
    Filed: February 1, 2010
    Date of Patent: October 2, 2012
    Assignee: Fujitsu Limited
    Inventors: Yoichi Endo, Hideyuki Kannari
  • Patent number: 8274342
    Abstract: A duplexer includes a transmission filter connected between a common terminal and a transmission terminal, a reception filter connected between the common terminal and a reception; and a capacitor connected in parallel with the transmission filter and the reception filter between the transmission terminal and the reception terminal and has a capacitance so that a phase difference between a signal passing from the transmission terminal to the reception terminal through the transmission filter and the reception filter and a signal passing from the transmission terminal to the reception terminal through the capacitor, or connected in parallel with the reception filter between the common terminal and the reception terminal and has a capacitance so that a phase difference between a signal passing from the common terminal to the reception terminal through the reception filter and a signal from the common terminal to the reception terminal through the capacitor.
    Type: Grant
    Filed: June 23, 2011
    Date of Patent: September 25, 2012
    Assignee: Taiyo Yuden Co., Ltd.
    Inventors: Jun Tsutsumi, Kazuhiro Matsumoto, Shogo Inoue
  • Patent number: 8270913
    Abstract: A transceiver includes an RF receiver section having a plurality of RF receiver stages configured in parallel, and a configurable RF transmitter section. The plurality of RF receiver stages are selectively enabled in response to a control signal. The configurable RF transmitter section is configured to operate in one of: a mixed signal mode of operation and a phase modulation mode of operation, in response to the control signal.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: September 18, 2012
    Assignee: Broadcom Corporation
    Inventor: Ahmadreza (Reza) Rofougaran
  • Patent number: 8265569
    Abstract: Apparatus and methods are disclosed, such as those involving an electronic device. One such apparatus includes a transmitter; a receiver; and a transmit/receive switch configured to electrically block the receiver from the transmitter during a transmit period. The transmit/receive switch includes one or more MOSFETs coupled between an input node and an output node, the input node being electrically coupled to the transmitter, the output node being electrically coupled to the receiver. The one or more MOSFETs are configured to be off during the transmit period. The transmit/receive switch further includes a clamp circuit configured to couple the output node to ground during the transmit period. This configuration effectively protects the receiver while minimizing switching artifacts.
    Type: Grant
    Filed: September 14, 2009
    Date of Patent: September 11, 2012
    Assignee: Analog Devices, Inc.
    Inventor: Allen Barlow
  • Patent number: 8265571
    Abstract: A circuit arrangement includes a component having a closed signal path, that closed signal path connected to a first port, a second port and at least a third port. The component has a directed signal flow of a signal applied to one of that ports. Such a coupling device can be connected to a transmitter and to a receiver path, respectively.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: September 11, 2012
    Assignee: Intel Mobile Communications GmbH
    Inventors: Bernd Adler, Zdravko Boos
  • Patent number: 8265570
    Abstract: A Radio Frequency (RF) transmission method of a Radio Frequency Identification (RFID) reader using a plurality of channels is provided. The method includes: selecting at least part of the plurality of channels, measuring an RF power of each of the selected channels, determining a transmission environment of the RF according to a measurement determination, and modulating an RF signal according to the determined transmission environment.
    Type: Grant
    Filed: September 5, 2008
    Date of Patent: September 11, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jin-Hun Koo, Young-Hoon Min, Si-Gyoung Koo, Il-Jong Song, Kuang-Woo Nam
  • Patent number: 8265567
    Abstract: A front end circuit for coupling an antenna to a radio frequency (RF) transceiver for time domain duplex systems is disclosed. The front end circuit includes an antenna port, a power amplifier, a low noise amplifier, and a matching network. The output of the power amplifier and the input of the low noise amplifier are coupled to the matching network and connected in common to the antenna. The power amplifier and the low noise amplifier are activated and deactivated in sequence corresponding to the transmit and receive modes of the transceiver, and the matching network minimizes the effect that one has on the other at the designated operating frequency.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: September 11, 2012
    Assignee: Rfaxis Inc.
    Inventor: Oleksandr Gorbachov
  • Patent number: 8260214
    Abstract: A shared antenna architecture for multiple co-located radio modules is disclosed. For example, an apparatus may include an antenna, a first transceiver to communicate wirelessly across a first link, a second transceiver to communicate wirelessly across a second link, and a shared antenna structure communicatively coupled to the first transceiver, the second transceiver and the antenna. The shared antenna structure may comprise a combiner and at least one switch arranged to allow the first transceiver and the second transceiver to share the antenna for simultaneous operations or mutually-exclusive operations. Other embodiments are disclosed and claimed.
    Type: Grant
    Filed: March 9, 2009
    Date of Patent: September 4, 2012
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Jeff Marlett, Neil Hendin, Jerome Tu, James Beninghaus
  • Patent number: 8249524
    Abstract: A near field communication (NFC) transceiver contains a transmitter portion to generate a transmit wireless signal, and a receiver portion to receive and process a receive wireless signal. The circuit further contains a shunt capacitor, a switch, and an antenna interface to couple the transmitter portion and the receiver portion to an antenna designed to communicate with external antennas by inductive coupling. The switch couples the shunt capacitor in parallel with the antenna in one operational mode, and decouples the shunt capacitor from the antenna in another operational mode. Transmit and receive performance of the NFC transceiver are enhanced as a result.
    Type: Grant
    Filed: September 10, 2010
    Date of Patent: August 21, 2012
    Assignee: Texas Instruments Incorporated
    Inventors: Yogesh Darwhekar, Alok Prakash Joshi, Gireesh Rajendran, Subhashish Mukherjee, Apu Sivadas
  • Patent number: 8249536
    Abstract: An apparatus and method for removing a transmission leakage signal are provided. The apparatus includes: a directional coupler connecting an antenna to a transmission path and a reception path; and a reflection coefficient adjustment unit outputting a reflection signal to the reception path, the reflection signal having the same amplitude as and opposite phase to a first transmission leakage signal generated from the transmission path and input to the reception path and a second transmission leakage signal reflected by the antenna and input to the reception path.
    Type: Grant
    Filed: December 18, 2009
    Date of Patent: August 21, 2012
    Assignees: Samsung Techwin Co., Ltd., Sungkyunkwan University Foundation for Corporate Collaboration
    Inventors: Sung-chan Jung, Su-kyum Kim, Young-goo Yang
  • Publication number: 20120201174
    Abstract: A wireless communications device includes an antenna, a multi-port path selection structure having an antenna port connected to the antenna, and plural ports connected to respective one or more receive and transmit paths of the wireless communications device. The multi-port path selection structure has a transmit band reject filter connected to the transmit path and a second filter connected to the receive path.
    Type: Application
    Filed: April 18, 2012
    Publication date: August 9, 2012
    Applicant: ROCKSTAR BIDCO LP
    Inventors: Chun-Yun JIAN, Eric GAGNON, Lan HU
  • Patent number: 8233935
    Abstract: Aspects of a method and system for sharing RF filters in systems supporting WCDMA and GSM are provided. A receiver in a wireless device enables receiving WCDMA signals and GSM signals. The WCDMA signals may be received via at least one duplexer within the wireless device. A processing path for the received WCDMA signals or a processing path for the received GSM signals may be selected within the receiver. The processing paths may share bandpass filtering and signal amplification. A gain in the shared signal amplification may be adjusted after filtering the received signals. For received WCDMA signals, the gain adjustment may be based on a gain provided to the received WCDMA signals before applying the shared bandpass filtering. At least one signal may be generated for selecting the processing path and/or for adjusting the shared signal amplification gain.
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: July 31, 2012
    Assignee: Broadcom Corporation
    Inventor: Ahmadreza Rofougaran
  • Publication number: 20120190313
    Abstract: A switch element includes a switch device having a drain, a source and a plurality of gates, and at least one additional interconnect located between the plurality of gates, the additional interconnect operative to establish a constant potential between the at least two gates.
    Type: Application
    Filed: April 2, 2012
    Publication date: July 26, 2012
    Applicant: Skyworks Solutions, Inc.
    Inventors: Dima Prikhodko, Jerod F. Mason, Steven P. Matte, John Pessia, Jason Chiesa, Sergey Nabokin, Gene A. Tkachenko, Richard A. Carter, Steven C. Sprinkle, Mikhail Shirokov
  • Patent number: 8229369
    Abstract: Aspects relate to mitigating interference in a communication network that does not employ a centralized scheduler. A transmission sent on a subset of resources is evaluated to determine a number of communication pairs that have selected that subset of resources on which to transmit. If there are a large number of communication pairs transmitting on that subset, the transmission is ignored by a receiving device. The number of degrees of freedom that contain energy on the subset is evaluated to determine if an expected number of degrees of freedom that should have energy is met or exceeded. If the expected threshold number is met or exceed, the transmission is decoded by the receiving device, else the transmission is not decoded.
    Type: Grant
    Filed: May 1, 2009
    Date of Patent: July 24, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Junyi Li, Saurabh Tavildar, Rajiv Laroia, Thomas Richardson
  • Patent number: 8229370
    Abstract: A method for automatically adjusting signal output power of a ZigBee wireless module. The method includes sending a signal with an output power from a transmitter of a ZigBee module to a receiver. The ZigBee module includes a power amplifier/low noise amplifier (PA/LNA) circuit. The output power can be adjusted between a minimum level and a maximum level. Additionally, the method includes generating a Link Quality Indicator (LQI) by the receiver based on the signal strength and returning the LQI to the ZigBee module. If the LQI is not within a predetermined range between a maximum value and a minimum value, the method includes adjusting the output power for sending next signal. If the output power from the transmitter has reached to the minimum level or the maximum level, the method further includes adjusting the PA/LNA circuit of the ZigBee module for maintaining the LQI within the predetermined range.
    Type: Grant
    Filed: March 10, 2009
    Date of Patent: July 24, 2012
    Assignee: Minebea Co., Ltd.
    Inventors: Mario Wu, Makoto Nakayama, John Guo, Jack Lieng, Walter Lee
  • Patent number: 8224260
    Abstract: A radio frequency (RF) signal transmission/reception apparatus and an RF signal transmission/reception method are disclosed. The RF signal transmission/reception apparatus is adapted to perform a transmission/reception duplex function using a bi-directional mixer at the IF band or baseband, not at the RF band. When a reception signal of the RF band is passed through the bi-directional mixer, it is converted into a signal in any one of the IF band and the baseband. Also, when a transmission signal in any one of the IF band and the baseband is passed through the bi-directional mixer, it is converted into a signal of the RF band.
    Type: Grant
    Filed: December 8, 2006
    Date of Patent: July 17, 2012
    Assignee: LG Electronics Inc.
    Inventors: Hong Teuk Kim, Kwy Ro Lee, Sergey Sergeyev, Sergey Khvorov, Alexander Belonozhkin
  • Patent number: 8213877
    Abstract: Systems and methods are disclosed for an electronically adjustable signal filter system, which comprises, in some embodiments, a first filter coupled to an antenna coupling network and a second filter, a power amplifier coupled to the first filter, an antenna connected to an antenna coupling network, a pilot tone generator coupled to the first filter, and a first signal source connected to the power amplifier and first filter. In some embodiments, the power amplifier amplifies the first signal, the first filter places a notch into the first signal transmitted to the antenna coupling network, the antenna coupling network combines the first signal and a second signal received from the antenna and transmits a third signal to the second filter.
    Type: Grant
    Filed: May 18, 2011
    Date of Patent: July 3, 2012
    Assignee: Research in Motion Limited
    Inventors: Charles Nicholls, Alain Roussel
  • Patent number: 8208865
    Abstract: Embodiments of an RF front-end are presented herein. In an embodiment, the RF front end comprises a power amplifier (PA), a noise-matched low-noise amplifier (LNA), a balance network, and a four-port isolation module. A first port of the isolation module is coupled to an antenna. The second port of the isolation module is coupled to the balancing network. The third port is coupled an output of the PA. The fourth port is coupled to a differential input of the noise-matched LNA. The isolation module effectively isolates the third port from the fourth port to prevent strong outbound signals received at the third port from saturating the LNA coupled to the fourth port. Isolation is achieved via electrical balance. In an embodiment, the signal path coupling the antenna at the first port to the differential input of the LNA at the fourth port is shorter than a wavelength of the inbound signal received by the antenna.
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: June 26, 2012
    Assignee: Broadcom Corporation
    Inventors: Mohyee Mikhemar, Hooman Darabi
  • Patent number: 8208956
    Abstract: A multiband radio communication device according to the present invention comprises: a radio communication unit configured to transmit a first radio signal in a first frequency band and to receive a second radio signal in a second frequency band different from the first frequency band; a filter connected to the radio communication unit and configured to attenuate the first radio signal; a switch configured to disconnect the filter from the radio communication unit; a communication data determination unit configured to determine a condition of communication data transmitted or received via the radio communication unit; and a switch controller configured to operate the switch, on the basis of the condition of the communication data determined by the communication data determination unit.
    Type: Grant
    Filed: February 21, 2007
    Date of Patent: June 26, 2012
    Assignee: Kyocera Corporation
    Inventor: Hideto Kanou
  • Patent number: 8204451
    Abstract: A transceiver for use in a wireless device. The transceiver may include a receive portion for receiving an input RF signal. The receive portion may include at least one receive filter which may include a first filter. The transceiver may also include a transmit portion for transmitting an output RF signal. The transmit portion may include at least one transmit filter, which may include the first filter used in the receive portion. The transceiver may further include a plurality of switches, which may include a first switch coupled to an input of the first filter and a second switch coupled to an output of the first filter. The plurality of switches may be configurable to enable use of the first filter in the receive portion for receiving the input RF signal and use of the first filter in the transmit portion for transmitting the output RF signal.
    Type: Grant
    Filed: July 30, 2008
    Date of Patent: June 19, 2012
    Assignee: QUALCOMM Atheros, Inc.
    Inventors: Alireza Kheirkhahi, Hirad Samavati, Srenik Mehta, David Su, Brian Kaczynski
  • Publication number: 20120147791
    Abstract: A wireless telemetry module and associated method reject interference in a received signal. The wireless telemetry module includes an antenna receives a communication signal transmitted at a desired channel frequency and having a channel bandwidth. A transceiver is controlled to operate in receiving and transmitting modes by a processor. An interference rejection module receives control signals from the processor corresponding to the desired channel frequency and is coupled between the antenna and the transceiver when the transceiver is operating in the receiving mode.
    Type: Application
    Filed: February 17, 2012
    Publication date: June 14, 2012
    Inventors: Michael E. Nowak, William D. Verhoef, Eric D. Corndorf
  • Patent number: 8200168
    Abstract: A programmable antenna assembly includes a configurable antenna structure, a configurable antenna interface, and a control module. The configurable antenna structure includes a plurality of antenna elements that, in response to an antenna configuration signal, are configured elements into at least one antenna. The configurable antenna interface module is coupled to the at least one antenna and, based on an antenna interface control signal, provides at least one of an impedance matching circuit and a bandpass filter. The control module is coupled to generate the antenna configuration signal and the antenna interface control signal in accordance with a first frequency band and a second frequency band such that the at least one antenna facilitates at least one of transmitting and receiving a first RF signal within the first frequency band and facilitates at least one of transmitting and receiving a second RF signal within the second frequency band.
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: June 12, 2012
    Assignee: Broadcom Corporation
    Inventors: Ahmadreza (Reza) Rofougaran, Maryam Rofougaran
  • Patent number: 8185061
    Abstract: A wireless terminal includes an antenna which comprises an antenna element and at least one frequency switching circuit to control an operating frequency of the antenna element in accordance with a frequency control signal, a plurality of RF circuits to perform an RF signal processing, an antenna switch to connect the antenna to one of the plurality of RF circuits in accordance with a connection control signal, and a generation unit configured to generate the frequency control signal and the connection control signal in accordance with switching between a plurality of wireless communication systems or switching between transmission and reception.
    Type: Grant
    Filed: March 16, 2010
    Date of Patent: May 22, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Koichi Sato, Satoshi Mizoguchi, Isao Ohba
  • Patent number: 8185062
    Abstract: A configurable antenna assembly includes an antenna structure and a configurable antenna interface. The antenna structure is operable, in a first mode, to provide a first antenna structure and a second antenna structure, wherein the first antenna structure receives an inbound radio frequency (RF) signal and the second antenna structure transmits an outbound RF signal. The configurable antenna interface is operable in the first mode to provide a first antenna interface and a second antenna interface, wherein the first antenna interface is configured in accordance with a receive adjust signal to adjust at least one of phase and amplitude of the inbound RF signal, and wherein the second antenna interface is configured in accordance with a transmit adjust signal to adjust at least one of phase and amplitude of the outbound RF signal.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: May 22, 2012
    Assignee: Broadcom Corporation
    Inventors: Ahmadreza (Reza) Rofougaran, Maryam Rofougaran
  • Patent number: 8185162
    Abstract: An electrically tilted antenna system with polarization diversity has a dual polarized, tilt adjustable antenna (32). The antenna (32) has dipoles (34, 36) of two orthogonal polarizations associated with independently adjustable electrical tilt angles. The tilt angles are implemented by relative delays between corporate feed input or output signals, the delays being introduced by an antenna tilt assembly (54). Two signal feeders (F21, F22) associated with different antenna polarizations connect the antenna tilt assembly (54) to a base station filter assembly (50): the base station filter assembly 50 routes transmit signals from base stations (BS21, BS22) to different antenna polarizations via respective feeders (F21, F22) and the antenna tilt assembly (54). This assembly also divides receive signals from feeders (F21, F22) between both base stations (BS21, BS22).
    Type: Grant
    Filed: November 7, 2007
    Date of Patent: May 22, 2012
    Assignee: Quintel Technology Limited
    Inventors: Philip Edward Haskell, Louis David Thomas, Stephen Thomas Newbold, David Edwin Barker
  • Patent number: 8175541
    Abstract: A front end circuit for coupling an antenna to a radio frequency (RF) transceiver for time domain duplex systems is disclosed. The front end circuit includes an antenna port, a power amplifier, a low noise amplifier, and a matching network. The output of the power amplifier and the input of the low noise amplifier are coupled to the matching network and connected in common to the antenna. The power amplifier and the low noise amplifier are activated and deactivated in sequence corresponding to the transmit and receive modes of the transceiver, and the matching network minimizes the effect that one has on the other at the designated operating frequency.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: May 8, 2012
    Assignee: Rfaxis, Inc.
    Inventor: Oleksandr Gorbachov
  • Patent number: 8165535
    Abstract: Systems and methods may be provided for a CMOS RF antenna switch. The systems and methods for the CMOS RF antenna switch may include an antenna that is operative to transmit and receive signals over at least one radio frequency (RF) band, and a transmit switch coupled to the antenna, where the transmit switch is enabled to transmit a respective first signal to the antenna and disabled to prevent transmission of the first signal to the antenna. the systems and methods for the CMOS RF antenna switch may further include a receiver switch coupled to the antenna, where the receiver switch forms a filter when enabled and a resonant circuit when disabled, where the filter provides for reception of a second signal received by the antenna, and where the resonant circuit blocks reception of at least the first signal.
    Type: Grant
    Filed: May 25, 2007
    Date of Patent: April 24, 2012
    Assignee: Samsung Electro-Mechanics
    Inventors: Minsik Ahn, Chang-Ho Lee, Jaejoon Chang, Wangmyong Woo, Haksun Kim, Joy Laskar
  • Patent number: 8160518
    Abstract: A transceiver includes a harmonic termination circuit that receives a tunable harmonic voltage from a power amplifier control. The harmonic termination circuit includes a variable capacitor that is capable of adjusting its capacitance in response to the tunable harmonic termination voltage to achieve at least two modes of operation. The at least two modes of operation may be EDGE mode and GSM mode. In this embodiment, the harmonic termination circuit allows for linearity specifications of EDGE to be met, while not degrading the efficiency of the transceiver when operating in GSM mode. In one embodiment, the harmonic termination circuit further includes an inductive element in series with the variable capacitor.
    Type: Grant
    Filed: August 3, 2007
    Date of Patent: April 17, 2012
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Marcus R. Ray, Darrell G. Hill, Ricardo A. Uscola
  • Patent number: 8160511
    Abstract: In a first high frequency switch, a current path and a current path are connected in parallel. When a positive voltage is applied to a control terminal, a current flows through a path passing through (Vc2)?(DL)?(DSL1)?(DDI)?(GSL2)?(DL) and a path passing through (Vc2)?(DR)?(DD2)?(DL). In a second high frequency switch, a current path and a current path are connected in parallel. When a positive voltage is applied to a control terminal, a current flows through a first path and a second path. Thus, the transmission signal is switched with a low control voltage and deterioration of insertion loss characteristics or harmonic distortion characteristics is prevented.
    Type: Grant
    Filed: May 26, 2010
    Date of Patent: April 17, 2012
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Takanori Uejima
  • Publication number: 20120083224
    Abstract: A triple winding balun is combined with multiple switch assemblies to implement an antenna switch that provides good isolation, low loss, and good linearity with only a minor increase to the overall chip footprint. The antenna switch also isolates the receiver from power surges, where the power surges may be due to electrostatic discharge, undesirable WiMAX/LTE signals, etc. An exemplary antenna switch comprises a triple winding balun, a first switch subassembly, and an optional second switch subassembly. During stand-by and transmit modes, the first and second switch subassemblies respectively isolate the receiver from transmitter output current and connect a positive voltage bias to the third winding to prevent negative voltage swings at the receiver. During the receive mode, the configuration of the first and second switch subassemblies flips to connect the receiver to the third winding of the balun and to isolate the receiver from power surges.
    Type: Application
    Filed: March 11, 2011
    Publication date: April 5, 2012
    Inventors: Hendrik Visser, Berend Hendrik Essink
  • Patent number: 8149813
    Abstract: A wireless communications device having a fast-receive mode for measuring received signal strength indication (RSSI) enables the device to handle higher time division multiple access (TDMA) multislot classes without requiring that the device include either a second receiver or a receiver with a more advanced and expensive phase-locked loop (PLL) design. The time to complete an RSSI measurement is reduced by initiating the sampling of signal strength before the radio transceiver is fully stabilized in the downlink mode. By initiating sampling before PLL stabilization is complete, the overall time to complete an RSSI measurement is reduced sufficiently to enable scheduling of an RSSI measurement in each GSM frame.
    Type: Grant
    Filed: August 13, 2008
    Date of Patent: April 3, 2012
    Assignee: Research In Motion Limited
    Inventors: Phat Hong Tran, Oleksiy Kravets
  • Patent number: 8145142
    Abstract: Certain aspects of a method and system for increased resolution switching using MEMS and switched capacitors may include a mobile terminal that includes an integrated circuit bonded to a multi-layer package. A capacitance of a first switched capacitor array in the multi-layer package may be tuned via one or more MEMS switches integrated in and/or on the multi-layer package. A capacitance of a second switched capacitor array in the integrated circuit may be tuned via one or more NMOS switches. A plurality of signals may be transmitted and/or received via one or more antennas in the mobile terminal.
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: March 27, 2012
    Assignee: Broadcom Corporation
    Inventors: Ahmadreza Rofougaran, Maryam Rofougaran
  • Patent number: 8140025
    Abstract: A front end circuit for coupling an antenna to a radio frequency (RF) transceiver for time domain duplex systems is disclosed. The front end circuit includes an antenna port, a power amplifier, a low noise amplifier, and a matching network. The output of the power amplifier and the input of the low noise amplifier are coupled to the matching network and connected in common to the antenna. The power amplifier and the low noise amplifier are activated and deactivated in sequence corresponding to the transmit and receive modes of the transceiver, and the matching network minimizes the effect that one has on the other at the designated operating frequency.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: March 20, 2012
    Assignee: RFAXIS, Inc.
    Inventor: Oleksandr Gorbachov
  • Publication number: 20120064843
    Abstract: A communication device as disclosed herein may include a body, an antenna assembly provided in the body, and configured to transmit or receive wireless signals, and a circuit board connected to the antenna assembly and configured to process the wireless signals. The antenna assembly may include a carrier having at least one region that is dimensioned to be farther away from the body than other portions thereof, and a radiator provided on the at least one dimensioned region of the carrier and configured to receive or radiate electromagnetic waves corresponding to the wireless signals. The radiator may be positioned on the dimensioned region of the carrier such that a specific absorption rate (SAR) due to the antenna assembly is reduced.
    Type: Application
    Filed: April 14, 2011
    Publication date: March 15, 2012
    Inventors: Changil KIM, Soyeon LEE, Yeomin YOUN, Kyunghack YI, Jin LEE
  • Patent number: 8135355
    Abstract: A front end circuit for coupling an antenna to a radio frequency (RF) transceiver for time domain duplex systems is disclosed. The front end circuit includes an antenna port, a power amplifier, a low noise amplifier, and a matching network. The output of the power amplifier and the input of the low noise amplifier are coupled to the matching network and connected in common to the antenna. The power amplifier and the low noise amplifier are activated and deactivated in sequence corresponding to the transmit and receive modes of the transceiver, and the matching network minimizes the effect that one has on the other at the designated operating frequency.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: March 13, 2012
    Assignee: Rfaxis, Inc.
    Inventor: Oleksandr Gorbachov