Frequency Conversion Between Signal Source (e.g., Wave Collector) And Receiver Patents (Class 455/131)
  • Patent number: 10644734
    Abstract: A method of selecting an intermediate frequency, IF, for use with a low-IF receiver, the method comprising determining a first frequency as the central frequency of the system bandwidth of the communication scheme used by the low-IF receiver, determining a second frequency as the central frequency of the bandwidth of the wanted signal to be received, selecting the sign of the IF to be used based on the first and second frequencies.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: May 5, 2020
    Assignee: SEQUANS COMMUNICATIONS S.A.
    Inventors: Serguei Burykh, Thomas Winiecki, Serdar Sezginer, Krzysztof Walczak
  • Patent number: 10368404
    Abstract: A solid-state microwave generator for applying energy to a load disposed in a cavity is provided. The microwave generator comprises an oscillator, a preamplifier coupled to the oscillator, a power amplifier coupled to the preamplifier; a radiating element coupled to the power amplifier and in communication with the cavity; and a passive, microstrip bandpass filter with a predetermined passband in the microwave region of the electromagnetic spectrum connected in a line between the oscillator and the power amplifier. The output of the passive, microstrip bandpass filter is connected to an input of the power amplifier to limit the energy transmitted by the radiating element into the cavity at frequencies outside of the passband.
    Type: Grant
    Filed: March 21, 2014
    Date of Patent: July 30, 2019
    Assignee: Whirlpool Corporation
    Inventor: Conny A. Johansson
  • Patent number: 10038409
    Abstract: Methods and devices are described for reducing receiver complexity in an RF front-end stage. In one exemplary implementation, a switch is used to connect a plurality of receive paths to a single input amplifier of a transceiver unit used the RF front-end stage. In another exemplary implementation, the switch has a tunable network which can be tuned with respect to various frequencies of operation of the receive path and associated RF signal.
    Type: Grant
    Filed: March 3, 2014
    Date of Patent: July 31, 2018
    Assignee: pSemi Corporation
    Inventor: Dan William Nobbe
  • Patent number: 9936381
    Abstract: A master terminal transmits sound waves that are a synchronization signal from a speaker to a slave terminal at random time intervals. Upon acquiring the sound waves that are the synchronization signal by microphone, the slave terminal promptly transmits a response signal through wireless communication to the master terminal. The master terminal receives the response signal and a terminal ID transmitted from the slave terminal. The master terminal receives the response signal multiple times and determines whether time intervals when synchronization signals were transmitted and time intervals when response signals were received match. When the synchronization signal time intervals and the response signal time intervals match, the master terminal recognizes the slave terminal that transmitted response signals at time intervals matching the synchronization signal time intervals as a wireless communication connection target.
    Type: Grant
    Filed: September 15, 2015
    Date of Patent: April 3, 2018
    Assignee: CASIO COMPUTER CO., LTD.
    Inventors: Yuji Tabata, Takahiro Tomida
  • Patent number: 9882593
    Abstract: A method includes, in a Wireless Local Area Network (WLAN) device that includes one or more primary transmission/reception (TX/RX) chains and an auxiliary reception (RX) chain, defining a first operational mode in which priority is given to transmission of the primary TX/RX chains, and a second operational mode in which the priority is given to reception of the auxiliary RX chain. communication is performed on a given communication channel using the primary TX/RX chains, and evaluation of signal activity is performed on one or more alternative communication channels using the auxiliary reception (RX) chain, while operating the WLAN device alternately in the first and second operational modes.
    Type: Grant
    Filed: December 25, 2014
    Date of Patent: January 30, 2018
    Assignee: CELENO COMMUNICATIONS (ISRAEL) LTD.
    Inventor: Nir Shapira
  • Patent number: 9877330
    Abstract: A method includes, in a Wireless Local Area Network (WLAN) device, communicating on a given communication channel using one or more primary transmission/reception (TX/RX) chains. Concurrently with communicating on the given communication channel using the primary TX/RX chains, signal activity is evaluated on one or more alternative communication channels using an auxiliary reception (RX) chain whose hardware is partially shared with one of the primary TX/RX chains.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: January 23, 2018
    Assignee: CELENO COMMUNICATIONS (ISRAEL) LTD.
    Inventor: Nir Shapira
  • Patent number: 9712113
    Abstract: Provided herein are oscillator paths between an oscillator and mixers. In an embodiment, the oscillator paths include a first path between an oscillator and a first mixer and a second path between the oscillator and the second mixer, in which the first path is enabled in a first state (e.g., a low band state) and the second path is enabled in a second state (e.g., a high band state). The first path can include a radio frequency divider configured to receive a signal having the oscillator frequency and to divide the signal in frequency by a positive odd integer divisor greater than one, and a duty cycle correction circuit configured to receive an output from the radio frequency divider and provide an output having a duty cycle that is closer to 50% than the output from the divider. Such separate oscillator paths can, for example, enhance receiver performance.
    Type: Grant
    Filed: December 1, 2015
    Date of Patent: July 18, 2017
    Assignee: Analog Devices Global
    Inventor: Sivanendra Selvanayagam
  • Patent number: 9622181
    Abstract: A method for reducing power consumption in a transceiver front-end circuit for a cellular radio. The transceiver circuit includes a receiver module having a delta-sigma modulator that converts analog receive signals to a representative digital signal in an interleaving process, where the delta-sigma modulator includes a low noise amplifier (LNA), an LC filter and a quantizer circuit. The LC filter is a multi-order filter and the quantizer circuit is an interleaving quantizer circuit that interleaves multiple groups of bits from the filter. The method includes selectively reducing the order of the LC filter in situations where a full dynamic range of the cellular radio is not required and reducing a bit resolution of the quantizer circuit so as to reduce the power requirements of the cellular radio.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: April 11, 2017
    Assignee: GM Global Technology Operations LLC
    Inventors: Timothy J. Talty, Cynthia D. Baringer, Mohiuddin Ahmed, Albert E. Cosand, James Chingwei Li, Peter Petre, Zhiwei A. Xu, Yen-Cheng Kuan
  • Patent number: 9210363
    Abstract: A wideband receiver system comprises a wideband analog-to-digital converter (ADC) module and a digital frontend (DFE) module. The wideband ADC is configured to concurrently digitize a band of frequencies comprising a plurality of desired channels and a plurality of undesired channels. The DFE module is coupled to the digital in-phase and quadrature signals. The DFE module is configured to select the plurality of desired channels from the digitized band of frequencies, and generate an intermediate frequency (IF) signal comprising the selected plurality of desired channels and having a bandwidth that is less than a bandwidth of the band of frequencies, where the generation comprises frequency shifting of the selected plurality of desired channels. The IF signal may be a digital signal and the DFE is configured to output the IF signal via a serial or parallel interface.
    Type: Grant
    Filed: February 10, 2015
    Date of Patent: December 8, 2015
    Assignee: MaxLinear, Inc.
    Inventors: Madhukar Reddy, Curtis Ling, Tim Gallagher
  • Patent number: 9210362
    Abstract: A wideband receiver system comprises a mixer module, a wideband analog-to-digital converter (ADC) module, and digital circuitry. The mixer module is configured to downconvert a plurality of frequencies that comprises a plurality of desired television channels and a plurality of undesired television channels. The wideband ADC module is configured to digitize the swatch of frequencies comprising the plurality of desired television channels and the plurality of undesired television channels. The digital circuitry is configured to select the desired plurality of television channels from the digitized plurality of frequencies, and output the selected plurality of television channels to a demodulator as a digital datastream.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: December 8, 2015
    Assignee: MaxLinear, Inc.
    Inventors: Madhukar Reddy, Curtis Ling, Tim Gallagher
  • Patent number: 9172417
    Abstract: A method for managing power of a battery powered handheld audio device by receiving an indicia of signal quality for a received continuous-time radio signal. The method compares the indicia of signal quality to a signal threshold. Upon a favorable comparison, enacting a first analog signal conditioning setting. Upon an unfavorable comparison, enacting a second analog signal conditioning setting. The method further provides, upon the favorable comparison, disabling a digital filtering operation, and upon the unfavorable comparison, enabling the digital filtering operation.
    Type: Grant
    Filed: July 14, 2014
    Date of Patent: October 27, 2015
    Assignee: SIGMATEL, INC.
    Inventors: Jon David Hendrix, Michael R. May
  • Patent number: 9088272
    Abstract: A frequency shift-keying reader circuit includes a band-pass filter, a low noise amplifier, a first balun, an injection-lock divide-by-2 frequency divider, a sub-harmonic mixer and a low-pass filter. The band-pass filter performs a filtering procedure to a radio frequency signal, wherein the filtered radio-frequency signal is received by the low noise amplifier to provide an injection signal, and the injection signal is received by the first balun to generate a first differential signal and a second differential signal. The injection signal is received by the injection-lock divide-by-2 frequency divider to provide a first oscillation signal and a second oscillation signal, wherein the first differential signal, the second differential signal, the first oscillation signal and the second oscillation signal are received by the sub-harmonic mixer for performing a mixing procedure and thereafter generating an output signal, the low-pass filter performs a filtering procedure to the output signal.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: July 21, 2015
    Assignee: NATIONAL SUN YAT-SEN UNIVERSITY
    Inventors: Tzyy-Sheng Horng, Rong-Fu Ye, Jian-Ming Wu
  • Patent number: 9031510
    Abstract: A control apparatus of a capacitive touch sensor includes a capacitive sensor, a radio receiver, a setting unit, and a charge control unit. The capacitive sensor is coupled to a manipulation panel and detects an approach of a finger of a user to the manipulation panel and a touch of the finger on the manipulation panel. The radio receiver receives a radio broadcast at a radio receiving frequency. The setting unit sets a sensing frequency to a selected value, which is determined from a plurality of selectable sensing frequency values, corresponding to the radio receiving frequency. The charge control unit is coupled to a switching unit, and controls the switching unit to operate at the sensing frequency in order to charge and discharge an electrostatic capacitance generated between the capacitive sensor and the finger.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: May 12, 2015
    Assignee: DENSO CORPORATION
    Inventor: Yuusuke Oda
  • Patent number: 9002295
    Abstract: A SAW-less receiver includes an FEM interface module, an RF to IF receiver section, and a receiver IF to baseband section. The RF to IF receiver section includes a mixing module, a mixed buffer section, and a frequency translated BPF (FTBPF) circuit module. The mixing module converts an inbound RF signal into an in-phase (I) mixed signal and a quadrature (Q) mixed signal. The mixed buffer section filters and buffers the I mixed signal and filter and buffer the Q mixed signal. The FTBPF circuit module frequency translates a baseband filter response to an IF filter response such that the FTBPF circuit module filters undesired signal components of the IF I signal and the IF Q signal to produce an inbound IF signal. The receiver IF to baseband section converts the inbound IF signal into one or more inbound symbol streams.
    Type: Grant
    Filed: September 16, 2013
    Date of Patent: April 7, 2015
    Assignee: Broadcom Corporation
    Inventors: Ahmad Mirzaei, Hooman Darabi
  • Patent number: 8995940
    Abstract: A technique includes receiving data that is communicated in a frame over a wireless network and processing the data through a filter. A response of the filter is changed during the processing.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: March 31, 2015
    Assignee: Silicon Laboratories Inc.
    Inventors: Srihari Adireddy, Brian D. Green
  • 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: 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
  • Publication number: 20150011170
    Abstract: An apparatus and method associated with exploiting a characteristic in super-heterodyne receivers such that a modulated signal will be received on all channels simultaneously regardless of the channel selected on the receiver.
    Type: Application
    Filed: April 4, 2014
    Publication date: January 8, 2015
    Applicant: THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY
    Inventors: George Whitaker, Jeff Maas, Andrew Christianson
  • Patent number: 8874054
    Abstract: A device for receiving a broadband multi-channel radiofrequency signal includes a radiofrequency analog input stage connected to an intermediate-frequency conversion stage. The conversion stage includes at least one conversion chain having a frequency mixer that transposes the signal to an intermediate frequency connected to the input of an analog-digital converter with a high frequency sampling rate. The intermediate and sampling frequencies in each conversion chain are selected such that, considering the noise generated by the sampling overtones of the corresponding analog-digital converter, each of the radiofrequency signal channels has a signal/noise ratio that is greater at output than a predetermined value of at least one conversion chain.
    Type: Grant
    Filed: August 13, 2013
    Date of Patent: October 28, 2014
    Assignee: EADS Secure Networks
    Inventors: Benoit Clement, Gilles Latouche, Olivier Muller
  • Patent number: 8855579
    Abstract: A method may include measuring a frequency difference between an actual frequency and an expected frequency associated with a frequency control calibration signal value for each of a plurality of frequency control calibration signal values during a calibration phase. The method may additionally include generating integral non-linearity compensation values based on the frequency differences measured The method may further include generating the applied frequency control signal based on a frequency control calibration signal value received by the digital-to-analog converter during the calibration phase. The method may also include generating a compensated frequency control signal value based on a frequency control signal value received by the integral non-linearity compensation module and an integral non-linearity compensation value associated with the frequency control signal value during an operation phase of the wireless communication element.
    Type: Grant
    Filed: June 6, 2012
    Date of Patent: October 7, 2014
    Assignee: Intel IP Corporation
    Inventors: David Harnishfeger, Kristopher Kaufman
  • Patent number: 8854985
    Abstract: A system for wireless communication using ultrasonic signals that includes a transmission module, which receives input signals from a wireless device, modifies the received input signals in a manner that converts each received input signal into a corresponding ultrasonic signal and wirelessly transmits each said ultrasonic signal over an ultrasonic link, and a receiving module, which receives the transmitted ultrasonic signals, recovers the corresponding input signals therefrom and enables outputting each respective input signal through one or more output devices. Modification of the input signals may include compressing, encoding and modulating the input signals. The input signals may be voice audio signals for enabling to use the system for supporting phone calls by enabling ultrasonic communication between for instance, a wireless headset and a mobile phone.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: October 7, 2014
    Inventor: Yossef Tsfaty
  • Patent number: 8843090
    Abstract: A transceiver arrangement includes a first receive path including a first connection and a first receive amplifier, and a second receive path including a second connection, a second receive amplifier, and a frequency conversion device. The transceiver also includes a controllable coupling device configured to couple an output of the first receive amplifier to an input of the frequency conversion device on the second signal path, and a control circuit configured to provide a control signal to the coupling device for selectively combining signals delivered by the first and second receive amplifiers in the correct phase based on a parameter which is derived from a signal present at the first connection or second connection, or both. The parameter derived from the received signal represents whether a signal strength of the received signal or a signal quality of the received signal exceeds a first predetermined threshold.
    Type: Grant
    Filed: July 16, 2012
    Date of Patent: September 23, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventor: Zdravko Boos
  • Patent number: 8823423
    Abstract: Apparatus for a wireless tachometer receiver. The wireless tachometer receiver includes a receiver and a signal conditioner that drives a conventional tachometer. Conventional tachometers require an input consisting of pulses at the operating voltage of the vehicle, which is typically 12 Vdc. Conventional receivers have an alternating current output that is substantially less than the operating voltage of the vehicle, which is insufficient to trigger the tachometer reliably. The signal conditioner converts the receiver output to a signal that allows for reliable operation of the conventional tachometer. In one embodiment, the signal conditioner is an amplifier that has a gain to drive the amplifier output between zero and the operating voltage of the vehicle. In another embodiment, the signal conditioner is a step-up transformer that has a ratio sufficient to produce an output at the operating voltage of the vehicle.
    Type: Grant
    Filed: April 29, 2013
    Date of Patent: September 2, 2014
    Inventor: Terry Pennisi
  • Patent number: 8805272
    Abstract: A radio transmission system includes: a first electronic device; and a second electronic device having a mounting structure mounted with the first electronic device, wherein a millimeter wave signal transmission line capable of transmitting information in a millimeter wave band is formed between the first electronic device and the second electronic device when the first electronic device is mounted in the mounting structure of the second electronic device, and between the first electronic device and the second electronic device, a transmission object signal is converted into a millimeter wave signal and then the millimeter wave signal is transmitted via the millimeter wave signal transmission line.
    Type: Grant
    Filed: July 6, 2010
    Date of Patent: August 12, 2014
    Assignee: Sony Corporation
    Inventor: Hirofumi Kawamura
  • Patent number: 8787864
    Abstract: Techniques for performing analog calibration of a receiver to optimize a second-order input intercept point (IIP2). In an aspect, a signal generator modeling an interferer is coupled to an adjustable input of a receiver, e.g., a gate bias voltage of a mixer. For example, the signal generator output may be a single-tone on-off keying (OOK) modulated signal. The mixer mixes the signal down to baseband, wherein an analog correlator correlates the down-converted signal with the known sequence of bits used to perform the OOK modulation. The analog correlation output is then provided to drive the bias voltage in the mixer, e.g., one or more gate voltages of transistors in the differential mixer, to optimize the overall receiver IIP2. Further aspects of the disclosure provide for calibrating receivers having multiple LNA's, and also dual or diversity receivers having multiple receive paths.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: July 22, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Lai Kan Leung, Gary John Ballantyne, Chiewcharn Narathong
  • Patent number: 8787863
    Abstract: A unidirectional sampling mixer utilizes a stepped phase modulation to shift the frequency of an RF input signal supplied to an RF input switch. An ordered set of phase shift values to be applied to the RF input signal and a set of times each element of which corresponds to a time at which a phase shift value is be applied to the RF signal are determined. For each phase shift value, 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 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: December 18, 2012
    Date of Patent: July 22, 2014
    Assignee: Invertix Corporation
    Inventors: Brecken H. Uhl, Daniel A. Law
  • Patent number: 8787831
    Abstract: A smart data storage apparatus and data transmitting method for the same are to combine the hard disk with the dual interface memory, and are to use radio frequency identification (RFID) technology or near field communication (NFC) technology. The information of the self-monitoring analysis and reporting technology (SMART) of the hard disk still could be received by the handheld device without the power for the hard disk. Moreover, the external hard disk could be registered with the handheld device quickly.
    Type: Grant
    Filed: June 5, 2012
    Date of Patent: July 22, 2014
    Assignee: Jogtek Corp.
    Inventors: Wei-Chun Huang, Tsung-Hsing Hsieh
  • Patent number: 8781421
    Abstract: Systems and methods are disclosed for time-domain diversity combining of radio frequency (RF) broadcast signals. Two channelized quadrature (I/Q) signals are generated by different tuner circuitry coupled to two different antennas, are converted to frequency-domain signals, and are used to generate frequency-domain diversity weighting signals. The frequency-domain diversity weighting signals are then converted to time-domain weights and applied to the channelized I/Q signals. The weighted and channelized I/Q signals are then combined in the time-domain to provide a time-domain diversity combined signal. The resulting combined signal can be further processed, as desired, such as by using a demodulator to generate demodulated output signals. Disclosed methods and systems can be applied to a variety of receiver systems configured to receive RF broadcast signals.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: July 15, 2014
    Assignee: Silicon Laboratories Inc.
    Inventors: Javier Elenes, Emmanuel Gautier, David Le Goff, Dana Taipale
  • Patent number: 8774328
    Abstract: In one embodiment, a receiver front end circuit can receive and process multiple radio frequency (RF) signals and output downconverted signals corresponding to these signals. In turn, multiple signal processors can be coupled to this front end. Specifically, a first signal processor can receive and process the downconverted signals to output a first signal obtained from content of a first RF signal, and a second signal processor can receive and process the downconverted signals to output a second signal obtained from content of a second RF signal. In addition, the apparatus may include a detection circuit coupled to the receiver front end circuit to detect presence of at least the second signal and enable the second signal processor responsive to the detected presence.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: July 8, 2014
    Assignee: Silicon Laboratories Inc.
    Inventors: Javier Elenes, Brian D. Green, Michael R. May
  • Patent number: 8761700
    Abstract: An active antenna system for a mobile communications network and a method for relaying radio signal in the mobile communications network is disclosed. The active antenna system comprises a plurality of antenna elements for relaying radio signals at a first frequency band. The antenna elements are connected to a plurality of signal paths. A plurality of signal inputs for inputting radio signals at a second frequency band is connected to the plurality of signal paths. A plurality of mixers in the signal paths converts the frequency of the radio signals between the first frequency band and the second frequency band. A plurality of local oscillators is connected to the mixers and a single reference oscillator can be connected through a plurality of first dispersion elements to different ones of the plurality of local oscillators through a plurality of first oscillator signal paths and to a digital signal processor.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: June 24, 2014
    Assignee: Kathrein-Werke KG
    Inventor: Peter Kenington
  • Patent number: 8755760
    Abstract: A radio receiver including a sampling unit, a provider, an arithmetic operation unit, an estimator, and a converter. The sampling unit samples a baseband signal transmitted from the radio transmitter, at a fractional multiple of a symbol rate, and generates fractional-multiple-sampling data. The provider provides reference data in which the known symbol sequence arranged in a frame by the radio transmitter is interpolated at a rate of the fractional multiple. The arithmetic operation unit performs an arithmetic operation for evaluation data in which the degree of consistency in waveform between the fractional-multiple-sampling data and the reference data is evaluated. The estimator estimates a reference timing from a shift amount at which the evaluation data shows the maximum degree of consistency in waveform. The converter converts the fractional-multiple-sampling data by using the reference timing as a reference thereby recovering the data having the symbol rate.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: June 17, 2014
    Assignee: International Business Machines Corporation
    Inventors: Yasunao Katayama, Daiju Nakano
  • Patent number: 8738074
    Abstract: A mobile communications radio receiver for multiple radio network operation includes an RF unit for generating a first down-converted signal from a radio signal received from a first radio network and a second down-converted signal from a radio signal received from a second radio network. Further, the receiver includes a first receiving unit including a user data channel demodulator configured to demodulate a dedicated user data physical channel and a control channel demodulator configured to demodulate a common control data channel of the first radio network based on the first down-converted signal. Still further, the receiver includes a second receiving unit including a pilot channel demodulator configured to demodulate a pilot channel of the second radio network based on the second down-converted signal. A first data connection is configured to couple control data contained in the second down-converted signal to the control channel demodulator of the first receiving unit.
    Type: Grant
    Filed: May 13, 2011
    Date of Patent: May 27, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventors: Thorsten Clevorn, Herbert Dawid, Bertram Gunzelmann
  • Patent number: 8731111
    Abstract: An apparatus and method for tunable wideband solar radio noise measurement is provided. Accordingly, it is possible to directly measure the absolute flux of solar radio waves in a desired frequency band using a tunable receiver, and accordingly, to protect radio communication broadcasting systems located on the earth from its damage caused due to radio burst, noise and the like.
    Type: Grant
    Filed: December 7, 2011
    Date of Patent: May 20, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jae Woo Park, Cheol Oh Jeong, Jae Hoon Kim, Jung Hoon Kim
  • Patent number: 8665933
    Abstract: A data transmitting and receiving device and method are used for saving powers and maintaining the connection quality, stability and continuous link. The method includes the step of gradually adjusting the de-emphasis of the signal transmitted from the data transmitting and receiving device according to the setting value thereof. The method also includes the steps of transmitting training sequence signal with an amplitude and the default de-emphasis by the data transmitting and receiving device to the remote device, receiving the training sequence signal from the remote device, thereby the channel attenuation is estimated using the method, and a better de-emphasis is set up. Then, the data transmitting and receiving device gradually increases the amplitude of the training sequence signal and re-transmits it until the remote device receives the training sequence signal transmitted therefrom.
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: March 4, 2014
    Assignee: Realtek Semiconductor Corp.
    Inventors: Liang-Wei Huang, Mei-Chao Yeh, Tzu-Han Hsu, Li-Han Liang
  • Publication number: 20140045443
    Abstract: Because of associated disadvantages of narrow-band off-chip radio-frequency (RF) filtering, a mixer-first receiver front-end designed to tolerate blockers with minimal gain compression and noise factor degradation is disclosed. The mixer-first receiver front-end includes two separate down-conversion paths that help to minimize added noise and voltage gain prior to baseband filtering, which are critical factors in eliminating narrow-band off-chip RF filtering.
    Type: Application
    Filed: August 13, 2012
    Publication date: February 13, 2014
    Applicant: Broadcom Corporation
    Inventors: Ahmadreza ROFOUGARAN, Hooman DARABI, David MURPHY
  • Patent number: 8644790
    Abstract: Antenna amplifiers and automobile top antenna devices are provided. The antenna amplifier includes an AM frequency selection circuit, an AM signal amplification circuit, an FM frequency selection circuit, an FM signal amplification circuit, and a power circuit. The antenna amplifier is further provided with a trap circuit that has an end connected to the ground terminal of the antenna amplifier, and another end connected to a metal mounting base for an antenna on the automobile top. The antenna device includes a shark-fin antenna case, a metal mounting base, an antenna support and a radio receiving antenna. The antenna case is mounted on the metal mounting base to form an internal accommodation space in which the antenna support, the radio receiving antenna and a circuit board with an antenna amplifier are provided.
    Type: Grant
    Filed: February 5, 2010
    Date of Patent: February 4, 2014
    Assignee: Taizhou Suzhong Antenna Group Co.
    Inventor: Xiaoping Jiang
  • Patent number: 8638888
    Abstract: One embodiment of the present invention relates to an analog correlation unit comprising a plurality of parallel correlation components configured to operating according to an advanced switched-capacitor low pass filter principle that increases coding gain of the unit. Each correlation component comprises a sampling stage and a correlation stage. The sampling stage may comprise a switched capacitor configured to sample a received baseband signal to determine a value (e.g., polarity) of the baseband signal. The sampled baseband signal is provided to the correlation stages, which may respectively comprise a plurality of switched integrators configured to selectively receive and integrate the sampled baseband signal over time depending upon values (e.g., polarity) of the correlation code to generate voltage potential values. The analog correlation result is evaluated by a comparison of an adjustable threshold voltage with the difference between the output voltage potential values.
    Type: Grant
    Filed: July 21, 2011
    Date of Patent: January 28, 2014
    Assignee: Infineon Technologies AG
    Inventors: Christian Hambeck, Stefan Mahlknecht, Thomas Herndl, Franz Darrer, Jakob Jongsma
  • Patent number: 8630600
    Abstract: Various embodiments provide for systems and methods for signal conversion of one modulated signal to another modulated signal using demodulation and then re-modulation. According to some embodiments, a signal receiving system may comprise an I/Q demodulator that demodulates a first modulated signal to an in-phase (“I”) signal and a quadrature (“Q”) signal, an I/Q signal adjustor that adaptively adjusts the Q signal to increase the signal-to-noise ratio (SNR) of a transitory signal that is based on a second modulated signal, and an I/Q modulator that modulates the I signal and the adjusted Q signal to the second modulated signal. To increase the SNR, the Q signal may be adjusted based on a calculated error determined for the transitory signal during demodulation by a demodulator downstream from the I/Q modulator.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: January 14, 2014
    Assignee: Aviat U.S., Inc.
    Inventors: Emerick Vann, Yen-Fang Chao, Youming Qin, Roland Matian
  • Patent number: 8583064
    Abstract: A receiver includes a first mixer configured to provide an in-phase (I) component of a radio frequency (RF) signal to an I channel by down-converting the RF signal, a second mixer configured to provide a quadrature (Q) component of the RF signal to a Q channel by down-converting the RF signal, amplification means, arranged on the I and Q channels, configured to amplify the I and Q components, a mismatch estimator configured to convert the amplified I and Q components into a frequency domain, and estimate a gain mismatch value and a phase mismatch value on the basis of the converted components, and a mismatch compensator configured to compensate for mismatch of the received signal on the basis of the estimated gain and phase mismatch values.
    Type: Grant
    Filed: October 13, 2011
    Date of Patent: November 12, 2013
    Assignee: GCT semiconductor, Inc.
    Inventors: Young Hwan Kang, Jiyoung Cho, Suwon Kang
  • Patent number: 8559904
    Abstract: In accordance with some embodiments of the present disclosure, an oscillator may include a crystal resonator and a squaring circuit coupled to the crystal resonator and configured to convert a sinusoidal signal produced by the crystal resonator to a square-wave signal, the squaring circuit comprising a bias circuit configured to transmit a selected bias voltage for the squaring circuit, the selected bias voltage selected from a plurality of potential bias voltages. In accordance with this and other embodiments of the present disclosure, an oscillator may include a crystal resonator, an inverter coupled in parallel with the crystal resonator, and a programmable voltage regulator coupled to the inverter. The programmable voltage regulator may be configured to supply a first supply voltage to the inverter during a startup duration of the oscillator, and supply a second supply voltage to the inverter after the startup duration, wherein the second supply voltage is lesser than the first supply voltage.
    Type: Grant
    Filed: August 19, 2010
    Date of Patent: October 15, 2013
    Assignee: Intel IP Corporation
    Inventors: John Simmons, Kristopher Kaufman
  • Patent number: 8543074
    Abstract: In a digital receiver, an ADC converts an analog RF signal to a digital RF signal at a sample rate of fADC, which is converted into M parallel streams of RF samples. Each stream has a sampling rate of fADC/M, where M is a positive integer greater than 1. After translation into M parallel streams of IF samples centered about an IF of fADC/4, they are demodulated by applying first coefficients to even IF samples to produce even demodulated samples and applying second coefficients to odd IF samples to produce odd demodulated samples. The even samples are filtered using first filter coefficients and the odd samples are filtered using second filter coefficients to produce a complex baseband signal.
    Type: Grant
    Filed: April 17, 2012
    Date of Patent: September 24, 2013
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Pierre-Andre Laporte
  • Patent number: 8525717
    Abstract: A half-bandwidth based quadrature analog-to-digital converter (ADC) includes in-phase circuitry, quadrature-phase circuitry, and digital complex processing circuitry. The in-phase circuitry includes an in-phase pair of ADCs, which provide an in-phase pair of sub-quadrature output signals, based on an analog in-phase input signal. Similarly, the quadrature-phase circuitry includes a quadrature-phase pair of ADCs, which provide a quadrature-phase pair of sub-quadrature output signals based on an analog quadrature-phase input signal. The digital complex processing circuitry combines, filters, and restructures the in-phase pair of sub-quadrature output signals and the quadrature-phase pair of sub-quadrature output signals to provide a digital in-phase output signal and a digital quadrature-phase output signal. Each of the in-phase pair of ADCs has about an ADC bandwidth. The in-phase circuitry has an input bandwidth, which is about equal to two times the ADC bandwidth in one embodiment of the in-phase circuitry.
    Type: Grant
    Filed: August 15, 2011
    Date of Patent: September 3, 2013
    Assignee: RF Micro Devices, Inc.
    Inventor: Nadim Khlat
  • Patent number: 8515370
    Abstract: A device for receiving a broadband multi-channel radiofrequency signal includes a radiofrequency analog input stage connected to an intermediate-frequency conversion stage. The conversion stage includes at least one conversion chain having a frequency mixer that transposes the signal to an intermediate frequency connected to the input of an analog-digital converter with a high frequency sampling rate. The intermediate and sampling frequencies in each conversion chain are selected such that, considering the noise generated by the sampling overtones of the corresponding analog-digital converter, each of the radiofrequency signal channels has a signal/noise ratio that is greater at output than a predetermined value of at least one conversion chain.
    Type: Grant
    Filed: March 17, 2009
    Date of Patent: August 20, 2013
    Assignee: EADS Secure Networks
    Inventors: Benoît Clement, Gilles Latouche, Olivier Muller
  • Patent number: 8515369
    Abstract: An apparatus and a method for selecting a transmission mode in a multi-antenna system are provided. The method includes checking a channel characteristic of a transmitting end using a signal received over at least two antennas; and determining a multi-antenna transmission mode according to the channel characteristic. Accordingly, the loss of the system capacity gain can be reduced and the capacity gain of the system can be increased.
    Type: Grant
    Filed: February 5, 2008
    Date of Patent: August 20, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Heon-Ki Chae, Keun-Chul Hwang, Sung-Woo Park
  • Publication number: 20130203368
    Abstract: Methods and systems for a baseband cross-bar may comprise receiving one or more radio frequency (RF) signals in a wireless communication device via antennas coupled to a plurality of receiver paths in the wireless device. The received RF signals may be converted to baseband frequencies. One or more of the down-converted signals may be coupled to receiver paths utilizing a baseband cross-bar. The baseband cross-bar may comprise a plurality of switches, which may comprise CMOS transistors. In-phase and quadrature signals may be processed in the one or more of the plurality of receiver paths. The one or more RF signals comprise cellular signals and/or global navigation satellite signals. A single-ended received RF signal may be converted to a differential signal in one or more of the plurality of receiver paths. The baseband cross-bar may be controlled utilizing a reduced instruction set computing (RISC) processor.
    Type: Application
    Filed: February 6, 2012
    Publication date: August 8, 2013
    Inventors: Raja Pullela, Sheng Ye, Morten Damgaard
  • Patent number: 8483625
    Abstract: An RF transceiver apparatus comprises transmitter circuitry arranged to convert signals from a baseband frequency to RF transmission frequencies and receiver circuitry arranged to convert signals from RF reception frequencies to the baseband frequency. The transmitter and receiver circuitry each comprise three mixers arranged to convert a signals between the baseband frequency, a first intermediate frequency; a second intermediate frequency that is higher than the transmission frequencies; and a second intermediate frequency to the transmission frequency.
    Type: Grant
    Filed: July 16, 2007
    Date of Patent: July 9, 2013
    Assignee: Lime Microsystems Limited
    Inventors: Srdjan Milenkovic, Danny Webster, Ebrahim Bushehri, Ri{hacek over (s)}ard Kurylo
  • Patent number: 8478215
    Abstract: A harmonic rejection mixer converts a frequency of a radio frequency signal by using a first to a third local signals (LOs) whose phases are different from each other, and the harmonic rejection mixer includes a phase difference detection circuit for detecting a phase difference between the first LO and the second LO, a phase difference detection circuit for detecting a phase difference between the first LO and the third LO, a phase adjustment circuit for adjusting the phase of the second LO so that the phase difference detected by the phase difference detection circuit becomes a first phase difference, and a phase adjustment circuit for adjusting the phase of the third LO so that the phase difference detected by the phase difference detection circuit becomes a second phase difference. It is thereby possible to achieve high precision harmonic rejection characteristics.
    Type: Grant
    Filed: July 15, 2011
    Date of Patent: July 2, 2013
    Assignee: Renesas Electronics Corporation
    Inventor: Naohiro Matsui
  • Patent number: 8478219
    Abstract: A down-conversion module for a heterodyne receiver comprises a first mixer circuit, a second mixer circuit and an interconnection. The first mixer circuit includes first and second differential control terminals and is arranged to produce a first down-converted differential voltage signal at a first down-converted frequency as a function of a first RF differential input signal applied to the first differential control terminals and of a first RF differential reference frequency signal applied to the second differential control terminals.
    Type: Grant
    Filed: July 25, 2008
    Date of Patent: July 2, 2013
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Saverio Trotta, Ralf Reuter
  • Patent number: 8457579
    Abstract: A method for signal processing includes distributing an analog input signal to a plurality of processing channels. In each processing channel, the input signal is mixed with a respective periodic waveform including multiple spectral lines, so as to produce a respective baseband signal in which multiple spectral slices of the input signal are superimposed on one another. The baseband signal produced in each of the processing channels is digitized, to produce a set of digital sample sequences that represent the input signal.
    Type: Grant
    Filed: February 15, 2010
    Date of Patent: June 4, 2013
    Assignee: Technion Research & Development Foundation Ltd.
    Inventors: Moshe Mishali, Yonina Eldar
  • Patent number: 8442438
    Abstract: A wireless transmitter includes a first filtering unit coupled to a first cable for outputting a first DC source transmitted on the first cable, a first power converting unit for converting the first DC source into a second DC source, a second filtering unit for eliminating noise in the second DC source, a first DC blocking unit for blocking the second DC source and outputting a second frequency modulation (FM) signal, an amplifier for amplifying the second FM signal to generate a first FM signal, and a second DC blocking unit coupled to the amplifier and the first cable, for outputting the first FM signal to the first cable, such that the first FM signal is transmitted to the air through the first cable as a transmitting antenna.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: May 14, 2013
    Assignee: Wistron NeWeb Corporation
    Inventors: Cheng-Hsiung Hsu, Chung-Wei Hsu, Cheng-Yen Wen, Chun-Chia Kuo