Frequency Modifying Or Conversion Patents (Class 455/313)
  • Patent number: 10044387
    Abstract: Measurement systems and methods are provided for performing preselection to remove images and spurs from a signal being measured that automatically determines a threshold value that is used in the preselection algorithm. Using the automatically-determined threshold value in the preselection algorithm improves image and spur removal from the final trace that is displayed on the display device of the measurement system by trading off the risk of images or spurs being contained in the final trace against the average level of noise bias.
    Type: Grant
    Filed: May 26, 2017
    Date of Patent: August 7, 2018
    Assignee: Keysight Technologies, Inc.
    Inventors: Joseph M. Gorin, Gordon Strachan
  • Patent number: 10014944
    Abstract: Distributed antenna systems supporting digital data signal propagation between remote antenna clusters, and related distributed antenna systems, components and methods are disclosed. The distributed antenna systems facilitate distributing digital data signals to provide digital data services remotely to distributed remote antenna units. The digital data signals may be propagated between remote antenna units within a remote antenna cluster for digital data signals transmitted to wireless client devices in the distributed antenna system and for digital data signals received from wireless client devices in the distributed antenna system. Received digital data signals from wireless client devices can be propagated from remote antenna unit to remote antenna unit in a remote antenna cluster until the digital data signals reach a wired network device for communication over a network.
    Type: Grant
    Filed: March 20, 2015
    Date of Patent: July 3, 2018
    Assignee: Corning Optical Communications LLC
    Inventors: Igor Berlin, Dan Harris, Michael Sauer
  • Patent number: 9985736
    Abstract: A method for populating a plurality of radio stations on a user device, the method includes receiving the plurality of radio stations, including a radio station signal type, receiving a broadcast area for each of the plurality of radio stations, receiving a request for radio service from the user device, the request for radio service comprising a location of the user device, a user device signal threshold, and a user device antenna capability, wherein the user device antenna capability comprises at least one signal type, calculating a plurality of user device ranges for each of the plurality of radio stations, determining, a plurality of in-range radio stations, filtering, the plurality of in-range radio stations based at least in part on the user device signal threshold, further filtering the plurality of in-range radio stations based at least in part on the user device antenna capability, and transmitting the plurality of in-range radio stations, and related content for the each of the plurality of in-range
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: May 29, 2018
    Assignee: TagStation, LLC
    Inventors: Ben Husmann, Paul Brenner
  • Patent number: 9893749
    Abstract: Methods and devices are provided for processing a received communication signal by a UE using an analog complex filter and using a single analog-to-digital converter (ADC). A control channel of the communication signal may be decoded to determine the frequency range in which a payload channel is located. The UE may then demodulate only the frequency range containing the payload channel. A complex representation of the received payload channel may be provided to the analog complex filter, with the payload channel shifted to a non-zero frequency IF. The analog complex filter may attenuate any portion of the complex representation that falls near ?IF. The UE may then convert only one component path of the filtered complex representation to a digital signal. A complex representation of the digital signal may then be generated, with the payload channel shifted to DC.
    Type: Grant
    Filed: January 15, 2016
    Date of Patent: February 13, 2018
    Assignee: Apple Inc.
    Inventors: Lydi Smaini, Tarik Tabet, Konstantinos Sarrigeorgidis, Syed Aon Mujtaba
  • Patent number: 9887792
    Abstract: A system and method for populating an available radio station broadcast list on a mobile device configured with a radio transmitter is disclosed.
    Type: Grant
    Filed: September 2, 2015
    Date of Patent: February 6, 2018
    Assignee: TagStation, LLC
    Inventors: Ben Husmann, Paul Brenner
  • Patent number: 9813266
    Abstract: The Distributed Combined Junctional Transformer (abbreviated in this document as repeater station) provides a system to take any input wireless signal in any frequency and using any modulation and multiplexing schemes, convert it to the desired format and frequency and subsequently transmits the new wireless signal. In accordance with an embodiment of the invention, a repeater station comprises: an input antenna section capable of receiving the input signal generated by any source device in radio, microwave, infrared, visible or ultraviolet spectrums; an input conversion section translating the input wireless signal to a baseband signal if required; a baseband processing section that interprets the information of the input signal, converts the signal to the desired format and controls the other sections; an output conversion section which translates the baseband frequency output signal to the desired carrier output frequency if required; and an output antenna section which transmits the output signal.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: November 7, 2017
    Inventor: Benjamin Kim
  • Patent number: 9722714
    Abstract: A receiver having a test signal generator configured to generate a test signal that free of a requirement to be frequency locked, and to measure a frequency of the test signal; and a local oscillator signal source configured to tune a local oscillator signal to a difference frequency with respect to the measured test signal frequency, wherein the difference frequency falls within a passband of a passband filter of the receiver.
    Type: Grant
    Filed: October 17, 2016
    Date of Patent: August 1, 2017
    Assignee: Intel IP Corporation
    Inventor: Timo Gossmann
  • Patent number: 9615175
    Abstract: There is provided a method of frequency assignment of wireless radio audio transmission systems having a plurality of wireless transmitters and at least one wireless receiver. The wireless transmitters can represent first wireless transmitters which in the switched-on condition can approach another wireless transmitter below an established minimum spacing and second wireless transmitters which in the switched-on condition cannot approach below the minimum spacing. The wireless transmitters serve for example to transmit an audio signal wirelessly to the at least one wireless receiver. The transmission frequencies of the first wireless transmitters are assigned having regard to possible intermodulation effects. The transmission frequencies of the second wireless transmitters are assigned having regard to the relative spatial distances of the second wireless transmitters relative to each other.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: April 4, 2017
    Assignee: Sennheiser electric GmbH & Co. KG
    Inventors: Sebastian Georgi, Axel Schmidt
  • Patent number: 9537690
    Abstract: A measurement apparatus, for example a digital oscilloscope, receives an amplitude modulated (AM) signal comprising a baseband signal, having a baseband waveform, modulating a carrier signal, and reconstructs the baseband waveform. The measurement apparatus: samples the AM signal at a sampling rate which produces a plurality of data samples for each period of the carrier signal; determines the amplitude of the baseband signal for each of a plurality of periods of the carrier signal from at least some of the plurality of data samples for each period; and reconstructs the baseband waveform from the amplitudes of the baseband signal for each of the plurality of periods of the carrier signal. The measurement apparatus may display the reconstructed baseband waveform on a display device.
    Type: Grant
    Filed: July 10, 2015
    Date of Patent: January 3, 2017
    Assignee: Keysight Technologies, Inc.
    Inventors: Daniel P. Timm, Steven J. Pelelo
  • Patent number: 9407206
    Abstract: A phased array architecture configured for current reuse is disclosed. In an exemplary embodiment, an apparatus includes a current mode phase rotator (PR) module configured to generate phase shifted in-phase (I) and quadrature-phase (Q) current signals, and a current mode residual sideband (RSB) correction module configured to correct residual sideband error associated with the phase shifted I and Q current signals. The RSB correction module and the PR module form a phased array element configured to reuse a DC supply current.
    Type: Grant
    Filed: April 24, 2012
    Date of Patent: August 2, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Saihua Lin, Roger Brockenbrough
  • Patent number: 9356732
    Abstract: In an example, there is disclosed a system and method for detecting and correcting error in a quadrature receiver (QR). The QR may include a receiver channel operable to divide a received RF signal into I and Q channels. The receiver channel may include error sources, such as (in sequence) pre-demodulation (PD) error, LO mixer error, and baseband (BB) error. Test tones may be driven on the receiver channel at a plurality of test frequencies, and a quadrature error corrector may be provided to detect error from each source. Upon receiving an RF signal, the quadrature error corrector may apply correction coefficients to correct each source of error in reverse sequence (BB, LO, PD).
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: May 31, 2016
    Assignee: Analog Devices, Inc.
    Inventors: Richard P. Schubert, Mariko Medlock, Wei An
  • Patent number: 9320040
    Abstract: In order to send electromagnetic signals received on one or more first frequency bands, the method applies a transformation to the signals, by performing the following actions: selecting first frequency sub-bands, forming a first set of frequency sub-bands of the first frequency band(s); using organization rules to associate one or more second sets of frequency sub-bands, forming one or more second frequency bands, with each first frequency sub-band of the first set; and using optimization rules to determine frequency translations to transpose the signals received in the first frequency sub-bands into signals sent in the second frequency band(s).
    Type: Grant
    Filed: May 6, 2015
    Date of Patent: April 19, 2016
    Assignee: E-Blink
    Inventors: Laurent Bellot, Stéphane Blanc, Tariq Boukour, Jean-Christophe Plumecoq, Jawad El Sayed
  • Patent number: 9288811
    Abstract: To reduce deterioration of a downlink signal when a multicarrier transmission is performed. A base station device eNB according to the present invention communication system includes: an uplink signal reception unit 17 configured to receive an uplink signal in a first carrier and an uplink signal in a second carrier, the uplink signal being transmitted from a user equipment UE; and a downlink signal transmission unit 15 configured to transmit a downlink signal in the first carrier and a downlink signal in the second carrier to the user equipment UE, wherein the downlink signal transmission unit 15 is configured to decide whether to transmit the downlink signal in the first carrier based on whether the uplink signal reception unit 17 receives the uplink signal in the second carrier.
    Type: Grant
    Filed: October 6, 2010
    Date of Patent: March 15, 2016
    Assignee: NTT DOCOMO, INC.
    Inventors: Hiromasa Umeda, Takashi Okada, Hiroyuki Ishii
  • Patent number: 9276620
    Abstract: A mixer included in a receiver of a wireless communication system is provided. The mixer includes a switching unit including a plurality of transistors receiving a Radio Frequency (RF) signal and a Local Oscillation (LO) signal, and outputting a baseband signal, and a voltage controller outputting a voltage control signal controlling a body voltage of at least one transistor from among the plurality of transistors to thereby control a threshold voltage of the at least one transistor.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: March 1, 2016
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jung-Hwan Han, Kuduck Kwon
  • Patent number: 9277308
    Abstract: A signal receiving structure of a wireless microphone contains a host controlled by a RS485 and connecting with a plurality of RS485 receivers via plural signal cables. The signal receiving ranges of the plurality of RS485 receivers are overlapped to expand a total receiving range. Any one of the plurality of RS485 receivers transmits at least one microphone signal back to the host through a RS485 remote-control communication interface after receiving the at least one microphone signal. Power is supplied through the plural signal cables from the host, thus expanding the using range of at least one wireless microphone. At least one receiving module in the plurality of RS485 receivers receives the at least one microphone signal, acquires a strong one of the at least one microphone signal by using automatic selection, and outputs the strong one of the at least one microphone signal to the host.
    Type: Grant
    Filed: March 19, 2014
    Date of Patent: March 1, 2016
    Assignee: Chiayo Electronics Co., Ltd.
    Inventor: Te-Wei Kung
  • Patent number: 9252818
    Abstract: An RF transceiver apparatus has transmitter circuitry receiving transmission signals at a transmitter baseband frequency and converting the signals to a transmission frequency, and receiver circuitry receiving signals at a reception frequency and converting to a receiver baseband frequency. A first digital local oscillator and a first mixer convert between the transmitter baseband frequency and a transmitter intermediate frequency. A second digital local oscillator and a second mixer convert between a receiver intermediate frequency and the receiver baseband frequency. A third mixer frequency receives a local oscillator signal for frequency conversion between the transmitter intermediate frequency and the transmission frequency. A fourth mixer frequency receives a local oscillator signal for frequency conversion between the reception frequency and the receiver intermediate frequency.
    Type: Grant
    Filed: November 20, 2013
    Date of Patent: February 2, 2016
    Assignee: Lime Microsystems LTD
    Inventors: Srdjan Milenkovic, Robin Miller, Ebrahim Bushehri
  • Patent number: 9246737
    Abstract: Methods, systems, and apparatus for down converting a modulated carrier signal to a demodulated baseband signal are described herein. A first switch is controlled with a first control signal which comprises a first sampling aperture with a specified frequency, wherein the first switch is on during the first sampling aperture and wherein the first switch is off outside the first sampling aperture. A second switch is controlled with a second control signal which comprises a second sampling aperture with a specified frequency, wherein the second switch is on during the second sampling aperture and wherein the second switch is off outside the second sampling aperture.
    Type: Grant
    Filed: March 5, 2015
    Date of Patent: January 26, 2016
    Assignee: ParkerVision, Inc.
    Inventors: David F. Sorrells, Michael J. Bultman, Robert W. Cook, Richard C. Looke, Charley D. Moses, Gregory S. Rawlins, Michael W. Rawlins
  • Patent number: 9246736
    Abstract: Methods, systems, and apparatuses for down converting a modulated carrier signal to a demodulated baseband signal are described herein. A first switch is controlled with a first control signal Which comprises a first sampling aperture with a specified frequency, wherein the first switch is on during the first sampling aperture and wherein the first switch is off outside the first sampling aperture. A second switch is controlled with a second control signal which comprises a second sampling aperture and wherein the second switch is off outside the second sampling aperture. The first and second control signals each control a charging and discharging cycle of a respective energy storage element so that for each switch a portion of energy is transferred to the respective energy storage element when the respective switch is on during the charging cycle, and a portion of previously transferred energy is discharged during the discharging cycle for each respective switch when the switch is off.
    Type: Grant
    Filed: March 5, 2015
    Date of Patent: January 26, 2016
    Assignee: ParkerVision, Inc.
    Inventors: David F. Sorrells, Michael J. Bultman, Robert W. Cook, Richard C. Looke, Charley D. Moses, Gregory S. Rawlins, Michael W. Rawlins
  • Patent number: 9226189
    Abstract: At a current time, a current intermodulation content of a predistortion system is determined. An intermodulation ratio is determined using the current intermodulation content and a previous intermodulation content for the predistortion system. The previous intermodulation content is determined at a time previous to the current time. The determined intermodulation ratio is compared with stored intermodulation ratios. A warning is communicated in response to the comparing indicating the predistortion system is unhealthy. Apparatus and computer program products are also disclosed.
    Type: Grant
    Filed: August 18, 2014
    Date of Patent: December 29, 2015
    Assignee: Nokia Solutions and Networks Oy
    Inventors: Shavantha Kularatna, Christian Reichl, Bjoern Jelonnek, Alan Pereira
  • Patent number: 9209750
    Abstract: A harmonic rejection mixer is disclosed that is capable of supporting wideband reception without any increase in circuit area. In this apparatus, transistors convert an RF signal to currents. Transistors perform frequency conversion based on the currents from the transistors and local oscillation signals. Transistors distribute the currents from the transistors to all transistors or some transistors based on a predetermined ratio. A load adds up the currents from the transistors and converts the resultant current to a voltage.
    Type: Grant
    Filed: December 25, 2013
    Date of Patent: December 8, 2015
    Assignee: PANASONIC CORPORATION
    Inventors: Masahiro Kumagawa, Yuusuke Yamaoka
  • Patent number: 9204582
    Abstract: A method includes permitting a first signal having a first electromagnetic waveform to pass through an apparatus. The method further includes blocking a second signal having a second electromagnetic waveform at the apparatus, wherein the second electromagnetic waveform is different than the first electromagnetic waveform. The apparatus includes a non-conductive substrate and a plurality of cells including conductive members coupled to the non-conductive substrate, where the conductive members are arranged to form a first discontinuous mesh, where regions between the conductive members of the first discontinuous mesh include a phase change material, and where the phase change material undergoes a phase transition from substantially non-conductive to substantially conductive.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: December 1, 2015
    Assignee: The Boeing Company
    Inventor: Tai A. Lam
  • Patent number: 9172381
    Abstract: A fast turn on compensation system for a synthesized signal source includes a synthesized signal source coupled to a power supply and configured to generate a phase stable radio frequency (RF) output signal. A mute amplifier is coupled to the synthesized signal source and the power supply. A dummy amplifier is coupled to the mute amplifier and the power supply. A mute controller is coupled to the mute amplifier and the dummy amplifier, the mute controller is responsive to an enable signal and configured to enable the dummy amplifier and disable the mute amplifier when no RF output signal is being generated and disable the dummy amplifier and enable the mute amplifier when the RF output signal is being generated such that total power supply current delivered to the synthesized signal source and the dummy amplifier or mute amplifier is approximately constant before, during, and after enabling the mute amplifier to reduce phase disturbance of the RF output signals.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: October 27, 2015
    Assignee: Hittite Microwave Corporation
    Inventors: Mark M. Cloutier, Greg Bachmanek, Tolga Pamir
  • Patent number: 9166632
    Abstract: A receiver including a mixer, a clock generator, a plurality of capacitances, a plurality of resistances, and a controller. The mixer includes a plurality of switches. The clock generator is configured to generate clock signals to drive the plurality of switches of the mixer. The plurality of capacitances couples the clock signals to respective inputs of the plurality of switches. The plurality of resistances couples to the respective inputs of the plurality of switches. The controller is configured to output a first signal to the plurality of resistances. The first signal determines one or more attributes of the clock signals. One or more switching characteristics of the plurality of switches of the mixer are based on the one or more attributes of the clock signals.
    Type: Grant
    Filed: June 10, 2014
    Date of Patent: October 20, 2015
    Assignee: Marvell International LTD.
    Inventors: Gregory Uehara, Brian Brunn, Xiaohua Fan, Sehat Sutardja
  • Patent number: 9154170
    Abstract: A circuit for a low-noise interface between an amplifier and an analog-to-digital converter (ADC) may comprise a capacitor element having a capacitance of C coupled between a first and second output node of the amplifier. A resistor circuit coupled between the capacitor element and input nodes of the ADC. A desired value RL for a load resistance of the amplifier is provided by selecting suitable initial values for resistances of the resistor circuit. A desired bandwidth for the at least one amplifier is achieved by selecting a value of the capacitance C based on the desired value RL for the load resistance.
    Type: Grant
    Filed: February 13, 2015
    Date of Patent: October 6, 2015
    Assignee: BROADCOM CORPORATION
    Inventors: Mohyee Mikhemar, Amir Hadji-Abdolhamid, Hooman Darabi
  • Patent number: 9154167
    Abstract: A radio frequency transmitting device includes a frequency multiplier circuit, a mixer circuit, a power splitter, a plurality of phase shifting circuits, a plurality of amplifiers, and a plurality of antennas. The frequency multiplier circuit is configured to amplify a fundamental signal to generate a harmonic signal. The mixer circuit is configured to generate a RF signal based on an input signal and the harmonic signal. The power splitter is configured to generate a plurality of sub-RF signals. The phase shifting circuits are configured to shift the phase of the sub-RF signals. The amplifiers are configured to amplify the power of the sub-RF signals. The antennas are configured to transmit the sub-RF signals. Furthermore, a radio frequency receiving device is also disclosed herein.
    Type: Grant
    Filed: July 2, 2014
    Date of Patent: October 6, 2015
    Assignee: NATIONAL TAIWAN UNIVERSITY
    Inventors: Jr-I Lee, Pen-Jui Peng, Pang-Ning Chen
  • Patent number: 9112517
    Abstract: A number of methods and clock generator units are disclosed to produce low Phase Noise clocks for use in Radio Frequency systems. The methods and clock generator units all use two reference clocks: a frequency-accurate reference that has comparatively high Phase Noise, and a frequency-inaccurate reference such as that from a BAW or MEMS clock source that has comparatively low Phase Noise. By combining multiple Phase-Locked Loops and a mixer, it is possible to produce flexible output frequencies whose frequency accuracy is derived from the first reference clock but whose Phase Noise level is derived from the second reference clock, all in a readily-integrated and relatively low-cost system.
    Type: Grant
    Filed: June 4, 2014
    Date of Patent: August 18, 2015
    Assignee: PMC-Sierra US, Inc.
    Inventors: William Michael Lye, Hormoz Djahanshahi, Mark Hiebert, Rod Zavari
  • Patent number: 9042859
    Abstract: A circuit includes first and second transconductance stages that generate first and second currents, respectively, in response to an input signal. A current combiner circuit selectively couples the first current to a first output, selectively couples the second current to the first output, selectively couples the first current to a second output, and selectively couples the second current to the second output. In response to the first current being coupled to both the first and second outputs, the current combiner circuit couples the second current to both the first and second outputs. In response to the first current being decoupled from the second output, the current combiner circuit decouples the second current from both the first and second outputs. In response to the first current being decoupled from the first output, the current combiner circuit decouples the second current from both the first and second outputs.
    Type: Grant
    Filed: July 8, 2013
    Date of Patent: May 26, 2015
    Assignee: Marvell World Trade Ltd.
    Inventors: Gregory Uehara, Xiaohua Fan
  • Patent number: 9037107
    Abstract: A communication device is disclosed. The device may be in particular a radio transmitter and a receiver that can operate with low power consumption and with improved interference rejection, therefore particularly suitable for use in low-power communication systems, such as wireless sensor networks and wireless body area networks. In one aspect, multiple frequency tones (carriers) are used to carry information from the transmitter, such that a RF signal having multiple radio frequency components is produced and transmitted. In the receiver, an envelope detector is still the RF down-converter. After down-converting intermodulation components are extracted containing amplitude, phase and frequency information of the multiple radio frequency components. This allows the desired signal (the baseband information) to be distinguished from the carriers and unwanted interference.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: May 19, 2015
    Assignee: Stichting IMEC Nederland
    Inventors: Xiongchuan Huang, Ruben De Francisco Martin, Guido Dolmans
  • Patent number: 9020026
    Abstract: A method and system for compensating for frequency dependent phase and amplitude imbalances is provided. A plurality of frequency sub-bands is extracted from a received wideband signal. Each of the plurality of frequency sub-bands is compensated to produce an associated plurality of compensated frequency sub-bands. The compensated sub-bands are summed in order to produce a compensated signal.
    Type: Grant
    Filed: January 6, 2011
    Date of Patent: April 28, 2015
    Assignee: LGS Innovations LLC
    Inventor: Robert L. Cupo
  • Patent number: 9020018
    Abstract: A calibration system may be provided for calibrating wireless communications circuitry in an electronic device during manufacturing. The calibration system may include data acquisition equipment and calibration computing equipment for receiving and processing test and calibration signals from wireless communications circuitry to be calibrated. During testing and calibration operations, a device may be provided with initial pre-distortion calibration values. The initial pre-distortion calibration values may be generated at least in part based on calibration operations performed for other wireless electronic devices. The device may generate a test signal using the initial pre-distortion calibration values. The calibration system may determine whether the test signal is within an acceptable range of a known reference signal.
    Type: Grant
    Filed: June 14, 2012
    Date of Patent: April 28, 2015
    Assignee: Apple Inc.
    Inventors: Gary Lang Do, David A. Donovan, Gurusubrahmaniyan Radhakrishnan
  • Patent number: 9020456
    Abstract: A wake-up function is provided for a low power radio. The radio includes: an antenna, a rectifier, and a comparator. The rectifier is configured to receive an RF signal from the antenna and generates an output having a magnitude that decreases in the presence of the RF signal. The comparator compares the output from the rectifier to a reference signal and outputs an activation signal for another radio component. In response the activation signal, the radio component will transition from a low power consumption mode to a higher power consumption mode. In this way, the rectifier and comparator cooperatively operate to perform a wake-up function in the presence of an RF signal.
    Type: Grant
    Filed: June 12, 2013
    Date of Patent: April 28, 2015
    Assignee: The Regents of the University of Michigan
    Inventors: David D. Wentzloff, Nathan E. Roberts
  • Patent number: 8989688
    Abstract: A circuit for a low-noise interface between an amplifier and an analog-to-digital converter (ADC) may comprise a capacitor element having a capacitance of C coupled between a first and second output node of the amplifier. A first resistor R1 may be coupled in parallel with the capacitor. A second resistor R2 may be coupled between the first output node of the amplifier and a first input node of the ADC. A third resistor R3 may be coupled between the second output node of the amplifier and a second input node of the ADC. Initial values of the resistances R1, R2, and R3 may be selected to provide a desired value RL for a load resistance of the amplifier. A value of the capacitance C may be selected so that, in combination with the desired value RL, a desired bandwidth for the amplifier is achieved.
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: March 24, 2015
    Assignee: Broadcom Corporation
    Inventors: Mohyee Mikhemar, Amir Hadji-Abdolhamid, Hooman Darabi
  • Patent number: 8983403
    Abstract: A frequency compensation device, applicable to a user equipment (UE) communicating with a first base station (BS), includes a receiving module and a transmitting module. The receiving module has an offset detection unit for performing following steps. A first signal from the first BS at a first receiving frequency is received. A first transmitting frequency where the first BS transmits the at least one first signal is read. A difference between the first transmitting frequency and the first receiving frequency is calculated and used as a frequency difference. The transmitting module is for performing following steps. A BS parameter corresponding to the first BS is obtained. A frequency compensation value according to the BS parameter is calculated. A second transmitting frequency according to the frequency compensation value corresponding to the first BS is compensated. A second signal to the first BS at the compensated second transmitting frequency is sent.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: March 17, 2015
    Assignee: Gemtek Technology Co., Ltd.
    Inventors: Fu-Ming Yeh, You-Chang Shih
  • Publication number: 20150072636
    Abstract: There is provided a solution for simultaneous reception of dual channel transmission. The solution is based on applying a first and a second oscillating signals, mixing and adding in order to separate the in-phase and quadrature components of first and second signal from a combined radio frequency signal received as input.
    Type: Application
    Filed: November 17, 2014
    Publication date: March 12, 2015
    Inventor: Risto Olavi Vaisanen
  • Patent number: 8977225
    Abstract: A unidirectional sampling mixer utilizes a stepped phase modulation to shift the frequency of an input signal. An RF input signal is supplied to an RF input switch from an RF input port. An ordered set of phase shift values to be applied to the RF input signal and a set of times each element of which correspond to a time at which a phase shift value is be applied to the RF signal are determined. For each phase shift value within the ordered set of phase shift values, a controller controls the RF input switch to select an input of a phase shifting device and controls an RF output switch to select an output of the phasing shifting device. The input of the phase shifting device and the output of the phase shifting device are selected to apply the phase shift value at its corresponding time to the RF input signal. A frequency shifted signal is supplied to an RF output port from an output of the RF output switch.
    Type: Grant
    Filed: June 19, 2014
    Date of Patent: March 10, 2015
    Assignee: Invertix Corporation
    Inventors: Brecken H. Uhl, Daniel A. Law
  • Patent number: 8971825
    Abstract: One embodiment of the present invention provides a synthesizer. The synthesizer includes one or more tunable oscillators, a frequency-dividing circuit coupled to the tunable oscillators, and a multiplexer coupled to the frequency-dividing circuit. The frequency-dividing circuit includes a number of frequency dividers, and is configured to generate a number of frequency-dividing outputs. At least one frequency-dividing output has a different frequency division factor. The multiplexer is configured to select a frequency-dividing output.
    Type: Grant
    Filed: June 13, 2014
    Date of Patent: March 3, 2015
    Assignee: Aviacomm Inc.
    Inventors: Shih Hsiung Mo, Yan Cui, Chung-Hsing Chang
  • Patent number: 8957722
    Abstract: A double balanced image reject mixer (IRM) can be configured to comprise: a common radio frequency (RF) port; four mixer devices, each comprising an intermediate frequency (IF) port, an RF port and an local oscillator (LO) port; and a four-way, in-phase splitter/combiner. The four-way, in-phase splitter/combiner can be connected between the RF common port and the RF port of each of the four mixer devices. A method of performing spurious suppression and image reject mixing in a double balanced IRM, can comprise: directly in-phase combining radio frequency (RF) output signals of four mixer devices located in the double balanced IRM; and phase pairing local oscillator (LO) signals and intermediate frequency (IF) signals such that the combination of the phases of the respective IF and LO signals can result in substantially equal phase RF signals at the RF ports of all four mixer devices.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: February 17, 2015
    Assignee: ViaSat, Inc.
    Inventors: Rob Zienkewicz, Kenneth Buer
  • Patent number: 8958766
    Abstract: An electronic appliance comprising an electrical circuit and an operating mode switching unit which can be awakened out of a sleep state into a working state in which the current consumption of the circuit is greater in than in the sleep state. To receive a radio signal, the appliance has a receiver comprising a UHF carrier that is amplitude-modulated by a modulation signal. The receiver comprises a UHF antenna connected to a passive filter stage to an input of a passive rectifier circuit. An output of the rectifier circuit is connected to a detector for the modulation signal. To wake the electrical circuit from the sleep state, the operating mode switching unit has a control connection to the detector. The appliance has a low current draw in the sleep state by matching the output impedance of the rectifier circuit to the input impedance of the detector.
    Type: Grant
    Filed: January 14, 2013
    Date of Patent: February 17, 2015
    Assignee: SmartExergy WMS GmbH
    Inventors: Tolgay Ungan, Gerd Ulrich Gamm, Leonhard Michael Reindl, Thomas Ostertag, Matthias Sippel, Thomas Wendt
  • Patent number: 8958769
    Abstract: A direct conversion receiver including an input stage, a frequency modulated local oscillator, a mixer stage, an output stage, and a DC blocker stage coupled between the mixer stage and the output stage. The input stage is receptive to a frequency modulated transmission having a carrier frequency fc and the frequency modulated local oscillator provides a frequency modulated local oscillator signal. In an embodiment, the frequency modulated local oscillator includes a local oscillator having an output with a frequency approximately equal to fc, a modulation source having a modulation signal output, and a frequency modulator coupled to the outputs of the local oscillator.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: February 17, 2015
    Assignee: Maxim Integrated Products, Inc.
    Inventor: Charles John Razzell
  • Publication number: 20150038100
    Abstract: A method, computer-readable storage medium, and signal processing apparatus for processing a plurality of input signals. The method includes receiving or generating a first intermediate signal and a second intermediate signal. The first and second intermediate signals are summed and the summed signals are output to a signal analog-to-digital converter having a predetermined sampling frequency.
    Type: Application
    Filed: October 2, 2014
    Publication date: February 5, 2015
    Applicant: Sony Corporation
    Inventor: Luke FAY
  • Patent number: 8948716
    Abstract: Various embodiments implement apparatuses and methods for conversion of radio frequency (RF) signals to intermediate frequency (IF) signals. More particularly, some embodiments are directed toward down conversion of RF signals to IF signals in a multi-band radio receiver, such as a satellite receiver, using a single oscillator for different frequency bands. For example, some of the apparatuses and methods presented are suitable for integration into monolithic RF integrated circuits in low-cost satellite receivers for home entertainment use.
    Type: Grant
    Filed: August 27, 2012
    Date of Patent: February 3, 2015
    Assignee: Entropic Communications, Inc.
    Inventors: Jeremy Goldblatt, Branislav Petrovic, Martin Alderton, Wing Fat Lau
  • Patent number: 8948708
    Abstract: Radio-frequency (RF) apparatus includes receiver analog circuitry that receives an RF signal and provides at least one digital signal to receiver digital circuitry that functions in cooperation with the receiver analog circuitry. The receiver analog circuitry and the receiver digital circuitry are partitioned so that interference effects between the receiver analog circuitry and the receiver digital circuitry tend to be reduced.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: February 3, 2015
    Assignee: Silicon Laboratories Inc.
    Inventors: Donald A. Kerth, Richard T. Behrens, Jeffrey W. Scott, G. Diwakar Vishakhadatta, G. Tyson Tuttle, Vishnu Srinivasan
  • Patent number: 8948714
    Abstract: A low noise converter includes a plurality of amplification circuits receiving a plurality of polarized wave signals transmitted from a satellite for amplifying the plurality of polarized wave signals, respectively, a plurality of switch circuits, each selecting one of outputs from the plurality of amplification circuits, a plurality of filter circuits provided corresponding to the plurality of switch circuits, respectively, for removing an image signal, a plurality of signal mixer-amplifiers provided corresponding to the plurality of filter circuits, respectively, to frequency-convert each output from the plurality of filter circuits by mixing with a local oscillation signal and to amplify the frequency-converted signal, and a plurality of output ports provided corresponding to the plurality of signal mixer-amplifiers, respectively, to receive an output from the plurality of signal mixer-amplifiers.
    Type: Grant
    Filed: August 6, 2012
    Date of Patent: February 3, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Kohji Motoyama
  • Patent number: 8942655
    Abstract: An integrated circuit comprising processing logic for operably coupling to radio frequency (RF) receiver circuitry arranged to receive a wireless network signal. The receiver circuitry generates in-phase and quadrature digital baseband representations of the wireless network signal. The processing logic determines quadrature (I/Q) imbalance of the RF receiver circuitry based on the in-phase and quadrature digital baseband representations of the wireless network signal.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: January 27, 2015
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Norman Beamish, Conor O'Keeffe, Patrick Pratt
  • Patent number: 8918139
    Abstract: An electronic device may include antenna structures. Wireless transmitter circuitry such as cellular telephone transmitter circuitry and wireless local area network circuitry may transmit signals using the antenna structures. A wireless receiver may receive signals from the antenna structures through an adjustable-linearity amplifier. The wireless receiver may operate in a receive band such as a satellite navigation system receive band. During operation of the electronic device, control circuitry in the device may analyze the frequencies and powers of the transmitted signals to determine whether there is a potential for interference for the receive band to be generated in the adjustable-linearity amplifier. In response to determining that there is a potential for interference, the control circuitry may increase the linearity of the adjustable-linearity amplifier.
    Type: Grant
    Filed: January 23, 2012
    Date of Patent: December 23, 2014
    Assignee: Apple Inc.
    Inventors: William J. Noellert, Ronald W. Dimpflmaier, Nicholas W. Lum
  • Publication number: 20140370832
    Abstract: In an embodiment, an apparatus includes a first signal path to receive and process a radio frequency (RF) signal of a first band and which has a first programmable digitizer to convert the RF signal of the first band into a digitized signal without downconversion. In addition, the apparatus further includes a second signal path to receive and process an RF signal of a second band, where at least portions of one or more of the paths may be shared during operation in the different bands.
    Type: Application
    Filed: June 18, 2013
    Publication date: December 18, 2014
    Applicant: Silicon Laboratories Inc.
    Inventors: Mark May, Carlos Briseno-Vidrios, Junsong Li
  • Patent number: 8909186
    Abstract: A receiver includes a first amplifier and a second amplifier, a first mixer, a second mixer and a third mixer, a first baseband signal path and a second baseband signal path. A signal output of the first amplifier is coupled to a signal input of the first mixer and a signal input of the second mixer. A signal output of the second amplifier is coupled to a signal input of the third mixer. A signal output of the first mixer and a signal output of the third mixer are coupled to the first baseband signal path. A signal output of the second mixer is coupled to the second baseband signal path.
    Type: Grant
    Filed: July 16, 2012
    Date of Patent: December 9, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventors: Bernd-Ulrich Klepser, Herbert Stockinger
  • Patent number: 8874063
    Abstract: Methods and circuits can down convert at least a first RF signal on a first path in a first frequency band to provide a first IF signal. A second RF signal on second path in a second frequency band can be down converted to provide a second IF signal. The first IF signal and the second IF signal are interspersed in the frequency domain, and the first frequency band is different from the second frequency band. A combiner can combine at least part of the first IF signal and the second IF signal to provide a combined signal on an output signal path for reception by a digital processing circuit. The first IF signal or second IF signal can be a Zero IF (ZIF), very low IF (VLIF), or Low IF (LIF) signal.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: October 28, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Jin-Su Ko, Hong Sun Kim, Liang Zhao, Cheng-Han Wang, Dominic Gerard Farmer
  • Patent number: 8867671
    Abstract: A conversion circuit (20) for converting a complex analog input signal having an in-phase, I, component and a quadrature-phase, Q, component resulting from frequency down conversion of a radio-frequency, RF, signal (XRF) to a frequency band covering 0 Hz into a digital representation is disclosed. It comprises a channel-selection filter unit (40) arranged to filter the complex analog input signal, thereby generating a channel-filtered I and Q components, and one or more processing units (53, 53a-b). Each processing unit comprises four mixers (60-75) for generating a first and a second frequency-translated I component and a first and a second channel-filtered Q component based on two LO signals with equal LO frequency and a 90° mutual phase shift. Furthermore, each processing unit comprises a combiner unit (85, 120) for generating a first, a second, a third, and a fourth combined signal proportional to sums and differences between said frequency translated I and Q components.
    Type: Grant
    Filed: June 13, 2011
    Date of Patent: October 21, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Lars Sunström, Roland Strandberg
  • Publication number: 20140308911
    Abstract: Methods, systems, and apparatuses for down-converting and up-converting an electromagnetic signal. In embodiments, the invention operates by receiving an electromagnetic signal and recursively operating on approximate half cycles of a carrier signal. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The invention accumulates the results of the recursive operations and uses the accumulated results to form a down-converted signal. In embodiments, up-conversion is accomplished by controlling a switch with an oscillating signal, the frequency of the oscillating signal being selected as a sub-harmonic of the desired output frequency. When the invention is being used in the frequency modulation or phase modulation implementations, the oscillating signal is modulated by an information signal before it causes the switch to gate a bias signal. The output of the switch is filtered, and the desired harmonic is output.
    Type: Application
    Filed: November 8, 2013
    Publication date: October 16, 2014
    Applicant: PARKERVISION, INC.
    Inventors: David F. Sorrells, Michael J. Bultman, Robert W. Cook, Richard C. Looke, Charley D. Moses, Gregory S. Rawlins, Michael W. Rawlins