Homodyne (i.e., Zero Beat Or Synchrodyne Reception) Patents (Class 455/324)
  • Patent number: 10237002
    Abstract: A method for determining a calibration parameter of a zero intermediate frequency radio receiver, and a zero intermediate frequency radio receiver are provided. The method includes: obtaining a plurality of sub-band training signals, where a sum of the plurality of sub-band training signals is a fullband training signal; determining a sub-band calibration parameter corresponding to each of the plurality of sub-band training signals; determining a fullband calibration signal according to the plurality of sub-band training signals and the sub-band calibration parameter corresponding to each of the plurality of sub-band training signals; and performing coefficient fitting on the fullband training signal and the fullband calibration signal, to determine a fullband calibration parameter. Because sub-band calibration parameters are obtained according to a plurality of different sub-band training signals, aliasing between an image signal and a training signal is reduced.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: March 19, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Lie Zhang, Jianxiong Bai, Meifeng Li, Qiang Li
  • Patent number: 10224905
    Abstract: A method comprises: receiving a differential input signal; converting the differential input signal into a first transmitted current and a second transmitted current using a common-source differential pair biased by a bias current; launching the first transmitted current and the second transmitted current onto a first port of a differential transmission line; receiving a first received current and a second received current from a second port of the differential transmission line; buffering the first received current and the second received current into a first output current and a second output current, respectively, using a current buffer, wherein the current buffer comprises: a common-gate amplifier pair, a first cross-coupling network configured to provide a negative feedback on the input side of the current buffer to reduce an input impedance of the current buffer, and a second cross-coupling network configured to provide a positive feedback on the output side of the current buffer to boost an output impe
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: March 5, 2019
    Assignee: REALTEK SEMICONDUCTOR CORP.
    Inventors: Chia-Liang (Leon) Lin, Fei Song
  • Patent number: 10153797
    Abstract: A communication module includes a first switch circuit that receives a first or second received signal and that outputs the first received signal from a first terminal thereof or the second received signal from a second terminal thereof, a first low-noise amplifier that amplifies the first received signal, a second low-noise amplifier that amplifies the second received signal, a first filter circuit disposed between the first switch circuit and the first low-noise amplifier, and a second filter circuit disposed between the first switch circuit and the second low-noise amplifier. The first filter circuit has greater signal loss than the second filter circuit. A signal path from the first terminal of the first switch circuit to the first low-noise amplifier via the first filter circuit has a shorter length than that from the second terminal of the first switch circuit to the second low-noise amplifier via the second filter circuit.
    Type: Grant
    Filed: December 7, 2017
    Date of Patent: December 11, 2018
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventor: Tomohide Aramata
  • Patent number: 9900037
    Abstract: A single transmission line couples multiple different antennas to corresponding radios using a low-loss signal selector made from a directional radio frequency coupler and a bandpass filter. A combiner receives signals from the antennas and combines those signals onto the one transmission line. The multiple, different-frequency signals on the transmission line are provided to a directional coupler having two outputs. One of the outputs from the directional coupler is routed to a first band pass filter having a pass band corresponding to a radio frequency required by a particular radio.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: February 20, 2018
    Assignee: Continental Automotive Systems, Inc.
    Inventors: Bob C Camello, Jianming Zhang, Benjamin Pokorny
  • Patent number: 9742451
    Abstract: A multiplexer device includes at least one acoustic band pass filter connected to a common port, and a hybrid LC/acoustic filter connected to the common port in parallel with the at least one acoustic band pass filter. Each acoustic band pass filter has a corresponding passband and includes multiple acoustic resonators. The hybrid LC/acoustic filter includes at least one acoustic resonator, and has at least one capacitor replaced by a corresponding at least one acoustic resonator, respectively. Each of the at least one acoustic resonator included in the hybrid LC/acoustic filter provides a stopband response when operating in a corresponding acoustic frequency range, and acts as a capacitor when operating in a corresponding non-acoustic frequency range.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: August 22, 2017
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Andriy Yatsenko, Hongya Xu, Lueder Elbrecht, Martin Handtmann
  • Patent number: 9621387
    Abstract: An improved quadrature modulator/demodulator (IQMD) may use two-phase quadrature local oscillator (LO) signal generation for generating 0° and 90° LO signals, and an anti-phase combiner/divider (at 0° and 180°) on the RF (radio frequency) port. The IQMD may include mixers (which may be double-balanced passive mixers) that function as downconverters when a signal is incident at their radio frequency (RF) ports, and function as upconverters when signals are incident on their intermediate frequency (IF) ports. Accordingly, the IQMD may function as an I/Q modulator by connecting digital-to-analog converters (DAC) to the differential I and Q ports, and/or it may also function as an I/Q demodulator by connecting analog-to-digital converters (ADC) to the differential I and Q ports.
    Type: Grant
    Filed: October 9, 2015
    Date of Patent: April 11, 2017
    Assignee: NATIONAL INSTRUMENTS CORPORATION
    Inventor: Justin R. Magers
  • Patent number: 9425906
    Abstract: Disclosed herein is a mixer. The mixer may include an MLO switching unit configured to include at least three MLO switches provided in odd numbers and configured to branch a signal from an input stage and to receive respective MLO signals and an LO switching unit configured to include pairs of LO switches connected in parallel to output sides of the MLO switches, wherein each of the pairs of LO switches corresponds to each of the MLO switches. Each of the pairs of LO switches is connected to the positive and negative intermediate frequency (IF) output sides so that the output sides of each of the pairs of LO switches alternately apply output signals to the positive and negative IF output sides when LO signals are sequentially input to each of the pairs of LO switches.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: August 23, 2016
    Assignee: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Minjae Lee, Dongju Lee
  • Patent number: 9344130
    Abstract: Techniques are described for calibration of a frequency converter for reducing a leakage-based direct current component at an output of the frequency converter. In an apparatus comprising a frequency converter arranged to perform frequency conversion on an input signal, a variable load arranged to act on at least one of an input and an output of the frequency converter, and a detector arranged to detect a direct current component of an output signal of the frequency converter, a plurality of states of the variable load are sequentially set, a variation between the direct current components for each one of the plurality of states of the variable load is observed, and at least one parameter influencing the direct current component of the output signal of the frequency converter is adjusted such that the observed variation is reduced.
    Type: Grant
    Filed: December 11, 2013
    Date of Patent: May 17, 2016
    Assignee: BROADCOM CORPORATION
    Inventors: Markus Rudiger Nentwig, Jouni Kristian Kaukovuori
  • Patent number: 9112482
    Abstract: A received is disclosed that is capable of improving reception sensitivity while avoiding an increase in circuit scale. The receiver includes: a multi-phase local oscillation signal generating section that generates a plurality of local oscillation signals of different phases; a phase selection signal generating section that generates a phase selection signal used to select a baseband signal of a predetermined phase based on a detection result of a reception level of a high-frequency signal; and a frequency converter that frequency-converts the high-frequency signal based on the plurality of local oscillation signals, that generates a plurality of baseband signals of different phases, and that selects a baseband signal from among the plurality of baseband signals based on the phase selection signal.
    Type: Grant
    Filed: December 25, 2013
    Date of Patent: August 18, 2015
    Assignee: Panasonic Corporation
    Inventors: Masahiro Kumagawa, Yoshifumi Hosokawa
  • Patent number: 9112566
    Abstract: An apparatus and method suppress unwanted signal components in receiving signals during wireless communication. A first circuitry is arranged to process a first signal, a second circuitry is arranged to apply transferred impedance filtering on a second signal according to a filter clock frequency, a signal branching circuitry is arranged to branch an input signal into the first circuitry and the second circuitry, and a signal combining circuitry is arranged to combine the processed first signal and the filtered second signal such that signal components of the first signal processed in the first circuitry and the filtered second signal are in-phase for signal frequencies equal to the filter clock frequency.
    Type: Grant
    Filed: February 26, 2013
    Date of Patent: August 18, 2015
    Assignee: BROADCOM CORPORATION
    Inventor: Markus Rudiger Nentwig
  • Patent number: 9077420
    Abstract: One aspect of the present invention includes an RF including a first mixer receiving an RF signal. A second mixer also receivers the RF signal. A resonant circuit couples to a common input of the first mixer and the second mixer. A second polyphase reactive circuit coupled to an output of the second mixer. In one embodiment, a direct current circuit coupled to the output of the first mixer, injecting direct current into the system. The resonant circuit is set at a resonance frequency such that a voltage across the second polyphase reactive circuit is a predetermined voltage.
    Type: Grant
    Filed: February 22, 2013
    Date of Patent: July 7, 2015
    Assignee: MStar Semiconductor, Inc.
    Inventors: Thomas McKay, Jonathan Gowing
  • Patent number: 9065557
    Abstract: A signal transmission device includes a signal sender that sends first and second transmission signals of mutually opposite phases, a first transmission path over which the first transmission signal is transmitted, a second transmission path over which the second transmission signal is transmitted, and a signal receiver that converts the first transmission signal received from the first transmission path and the second transmission signal received from the second transmission path into an output signal of a single phase. The signal transmission device differentiates each amplitude of the first and second transmission signals sent from the signal sender, and the signal receiver, based on an amplitude ratio of the first and second transmission signals, converts the received first and second transmission signals.
    Type: Grant
    Filed: July 2, 2014
    Date of Patent: June 23, 2015
    Assignee: Funai Electric Co., Ltd.
    Inventor: Shinichi Kodama
  • Patent number: 9054748
    Abstract: One embodiment of the present invention provides a receiver for wireless communication. The receiver includes a demodulator and at least one filtering mechanism coupled to the demodulator, and an analog-to-digital converter (ADC) coupled to the filtering mechanism. The filtering mechanism can be configured to function as a low-pass filter (LPF) or a band-pass filter (BPF), thereby enabling the receiver to function as a direct-conversion receiver or a low-intermediate frequency (low-IF) receiver.
    Type: Grant
    Filed: April 10, 2014
    Date of Patent: June 9, 2015
    Assignee: AVIACOMM INC.
    Inventors: Shih Hsiung Mo, Yan Cui, Chung-Hsing Chang
  • 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: 9020073
    Abstract: One embodiment relates to a low intermediate frequency (IF) receiver. The low-IF receiver includes an analog front end that is configured to receive a modulated IQ data signal and provide an in-phase signal and a quadrature signal, where the in-phase signal is phase shifted by approximately 90° relative to the quadrature signal. The low-IF receiver further includes a digital processing block, and a single path that provides only one of the in-phase signal and the quadrature signal to the digital processing block. Other receivers and methods are also disclosed.
    Type: Grant
    Filed: October 23, 2007
    Date of Patent: April 28, 2015
    Assignee: Intel Mobile Communications GmbH
    Inventors: Stefan van Waasen, Christian Grewing, Michael Lewis
  • Patent number: 9014653
    Abstract: A novel and useful reconfigurable superheterodyne receiver that employs a 3rd order complex IQ charge-sharing band-pass filter (BPF) for image rejection and 1st order feedback based RF BPF for channel selection filtering. The operating RF input frequency of the receiver is 500 MHz to 1.2 GHz with a varying high IF range of 33 to 80 MHz. The gain stages are inverter based gm stages and the total gain of the receiver is 35 dB and in-band IIP3 at mid gain is +10 dBm. The NF of the receiver is 6.7 dB which is acceptable for the receiver without an LNA. The architecture is highly reconfigurable and follows the technology scaling.
    Type: Grant
    Filed: September 16, 2013
    Date of Patent: April 21, 2015
    Assignee: Technische Universiteit Delft
    Inventors: Iman Madadi, Massoud Tohidian, Robert Bogdan Staszewski
  • Patent number: 8977519
    Abstract: A spectrum analyzer for measuring an RF signal over a selected frequency span configured to use multiple Intermediate Frequencies (IFs) for residual, spurious and image signal reduction. The spectrum analyzer has both a primary IF path and a secondary IF path configured to provide band pass filtering of the IF signals. A master clock synthesizer is configured to reduce residual noise by providing from a single Voltage Controlled Oscillator, a master clock signal and a Local Oscillator (LO) signal. The spectrum analyzer has a microcontroller configured to change the frequency of the master clock signal and the LO signal if the center frequency of the selected span is sufficiently close to a known spurious signal.
    Type: Grant
    Filed: February 14, 2011
    Date of Patent: March 10, 2015
    Assignee: Test Equipment Plus, Inc
    Inventor: Justin Crooks
  • Patent number: 8942656
    Abstract: In a radio receiver, a method of reducing second order distortion components, involves at a first mixer, mixing an input signal with an oscillator signal to generate an I component of a received radio signal; at a second mixer, mixing the input signal with a phase shifted oscillator signal to generate a Q component of the received radio signal; where the I and Q components of the received signal have a receive bandwidth; computing an estimate of second order distortion components as a power output of the I and Q components between approximately the receive bandwidth and twice the receive bandwidth of the received radio signals; and adjusting an operational parameter of the radio receiver to reduce the estimated value of second order distortion components. This abstract is not to be considered limiting.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: January 27, 2015
    Assignee: BlackBerry Limited
    Inventors: Tajinder Manku, Christopher Eugene Snyder, Stephen Arnold Devison
  • Patent number: 8929845
    Abstract: A system can include an input signal source, a local oscillator (LO), and an intermediate frequency (IF) receiver to receive an input signal from the input signal source and an LO signal from the LO. The IF receiver can include a switch to switch between the first and second inputs to provide an output. The IF receiver can generate a calibration signal from the LO signal.
    Type: Grant
    Filed: February 22, 2013
    Date of Patent: January 6, 2015
    Assignee: Tektronix, Inc.
    Inventors: Franklin Merlin Borden, Marcus Kieling Da Silva
  • Patent number: 8909166
    Abstract: An apparatus and method for controlling a multi-band antenna in a mobile communication terminal are provided. An apparatus for controlling a multi-band antenna in a mobile communication terminal includes a modem, an antenna unit, a Radio Frequency (RF) processing unit, and a switch module. The modem outputs at least one control signal corresponding to a target frequency band. The antenna unit changes a resonance frequency of the antenna according to the at least one control signal. The RF processing unit includes a plurality of transmission/reception (TX/RX) paths and processes TX/RX signals. The switch module connects the antenna to one of the TX/RX paths according to the at least one control signal.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: December 9, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jung-Ho Park, Sung-Hwan Ko, Suk-Chan Hong, Young-Hwan Jung
  • Patent number: 8848847
    Abstract: One embodiment of the present invention relates to a combined mixer filter circuit. The circuit includes a sampler, a plurality of filter branches, and a coefficient generator. The sampler is configured to provide a sampled signal by sampling a received signal at a specified rate. The plurality of filter branches has selectable filter coefficients. The plurality of filter branches are configured to receive the sampled signal and generate a mixed and filtered output signal without a separate mixer component. The coefficient generator is coupled to the plurality of filter branches. The coefficient generator is configured to assign filter coefficient values to the selectable filter coefficients to yield a selected mixing function for the mixed filtered output signal.
    Type: Grant
    Filed: April 10, 2012
    Date of Patent: September 30, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventors: Christoph Schultz, Markus Hammes, Rainer Kreienkamp
  • Patent number: 8849232
    Abstract: A receiver uses a local oscillator to receive data transmitted via a combination of radio frequency signals using carrier aggregation. Each radio frequency signal occupies a respective radio frequency band and the radio frequency bands are arranged in two groups, a first group and a second group, separated in frequency by a first frequency region, each of the groups including one or more radio frequency bands and the first group occupying a wider frequency region than the second group. The radio frequency signals are processed using the local oscillator by setting the local oscillator, during the processing, to a frequency that is offset from the centre of a band defined by outer edges of the frequency regions occupied by the two groups.
    Type: Grant
    Filed: November 18, 2011
    Date of Patent: September 30, 2014
    Assignee: Broadcom Corporation
    Inventors: Jouni Kristian Kaukovuori, Aarno Tapio Pärssinen, Antti Oskari Immonen
  • Patent number: 8836555
    Abstract: A sensor circuit for obtaining physical quantities with a small margin of error even when the temperature varies is provided. The sensor circuit includes a sensor, a sampling circuit for obtaining a voltage value or a current value of a signal output from the sensor during a predetermined period and holding the value, and an analog-to-digital converter circuit for converting the held analog voltage value or current value into a digital value. The sampling circuit includes a switch for obtaining the voltage value or the current value and holding the value. The switch includes a transistor including an oxide semiconductor in a channel formation region.
    Type: Grant
    Filed: January 14, 2013
    Date of Patent: September 16, 2014
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Jun Koyama, Shunpei Yamazaki
  • Patent number: 8831549
    Abstract: A receiver circuit, e.g., a low-IF receiver, including two mixing paths. The two mixing paths scale an input signal respectively by two mixing gains and shift phase of the input signal respectively by two mixing phase offsets to provide two mixed signals. The two mixing gains and the two mixing phase offsets are arranged to produce an amplitude adjustment between amplitudes of the two mixed signals and a phase difference of 90 degrees plus a phase adjustment between phases of the two mixed signals. With the amplitude adjustment and/or the phase adjustment properly tuned to nonzero value(s) in association with band-pass response of the receiver circuit, image rejection can be achieved and optimized. Associated method is also disclosed.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: September 9, 2014
    Assignee: Mediatek Inc.
    Inventors: Ang-Sheng Lin, Wei-Hao Chiu
  • Patent number: 8831143
    Abstract: A method for DC offset cancellation includes defining, in a range of possible gain values for operating a direct conversion receiver, multiple sub-ranges of the possible gain values. Multiple DC offset correction values for the respective sub-ranges are stored in a memory. Upon detecting at the receiver that a gain of the receiver has changed from a first sub-range to a second sub-range, DC offset cancellation is initiated based on a DC offset correction value stored for the second sub-range and on a condition relating to past operation in the second sub-range.
    Type: Grant
    Filed: December 22, 2013
    Date of Patent: September 9, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Rony Ashkenazi, Alexander Zaslavsky, Gregory Uehara, Brian Brunn
  • Patent number: 8768277
    Abstract: The present invention relates to a receiver circuit for processing of electrical signals, and comprising: an antenna (12), at least one amplifier (14) coupled to the output of the antenna (12), an automatic gain control circuit (30) coupled to the at least one amplifier (14) to modify a gain thereof, and at least one voltage offset-compensating circuit (50) embedded in the automatic gain control circuit (30) and comprising a clock generator (40) and at least one capacitor (42, 44) to effectively compensate an offset voltage.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: July 1, 2014
    Assignee: EM Microelectronics-Marin S.A.
    Inventors: Marc Morin, Tindaro Pittorino
  • Patent number: 8750441
    Abstract: A method includes obtaining an input signal and demodulating phase contamination in the input signal to generate a baseband signal. The method also includes modulating the input signal based on the baseband signal to generate an output signal, where the output signal has less phase contamination than the input signal. The phase contamination could be demodulated using a phase demodulator or a frequency modulation (FM) detector. A portion of the input signal could be down-converted to a lower frequency, and the phase contamination in the down-converted portion of the input signal could be demodulated. Additional phase contamination in the output signal can be demodulated and used to regulate a level of the baseband signal used during modulation of the input signal. The output signal could have less phase noise or period jitter than the input signal.
    Type: Grant
    Filed: December 19, 2011
    Date of Patent: June 10, 2014
    Assignee: Texas Instruments Incorporated
    Inventor: Lawrence H. Zuckerman
  • Patent number: 8724679
    Abstract: Transceiver calibration is a critical issue for proper transceiver operation. The transceiver comprises at least one RF transmit chain and one RF receive chain. A closed loop path is formed from the digital block, the RF transmit chain, the substrate coupling, the RF receive chain back to the digital block and is used to estimate and calibrate the transceiver parameters over the operating range of frequencies. The substrate coupling eliminates the need for the additional circuitry saving area, power, and performance. In place of the additional circuitry, the digital block which performs baseband operations can be reconfigured into a software or/and hardware mode to calibrate the transceiver. The digital block comprises a processor and memory and is coupled to the front end of the RF transmit chain and the tail end of the RF receive chain.
    Type: Grant
    Filed: April 9, 2012
    Date of Patent: May 13, 2014
    Assignee: Tensorcom, Inc.
    Inventor: Ismail Lakkis
  • Patent number: 8706071
    Abstract: One embodiment of the present invention provides a receiver for wireless communication. The receiver includes a demodulator and at least one filtering mechanism coupled to the demodulator, and an analog-to-digital converter (ADC) coupled to the filtering mechanism. The filtering mechanism can be configured to function as a low-pass filter (LPF) or a band-pass filter (BPF), thereby enabling the receiver to function as a direct-conversion receiver or a low-intermediate frequency (low-IF) receiver.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: April 22, 2014
    Assignee: Aviacomm Inc.
    Inventors: Shih Hsiung Mo, Yan Cui, Chung-Hsing Chang
  • Patent number: 8670740
    Abstract: A direct sampling tuner includes a low noise amplifier and an optional dynamically configurable band pass filter coupled to the low noise amplifier. The optional filter is configured to pass a selected band of channels. The tuner further includes a relatively high accuracy, multi-bit analog-to-digital converter (“ADC”) coupled to the LNA or to the optional dynamically configurable band pass filter. The ADC operates at greater than about twice a frequency of a sampled signal. The ADC directly samples the spectrum of the selected channels at the Nyquist rate, thus avoiding image problems presented by conventional tuners.
    Type: Grant
    Filed: May 19, 2011
    Date of Patent: March 11, 2014
    Assignee: Broadcom Corporation
    Inventor: Leonard Dauphinee
  • Patent number: 8638883
    Abstract: A method includes receiving a signal using a direct conversion receiver, while the receiver is set at a gain that is selected from a range of possible gain values. Multiple DC offset correction values are provided for use by a DC offset cancellation loop, each DC offset correction value being associated with a respective sub-range of the range of the possible gain values. A DC offset correction value is selected from among the multiple DC offset correction values based on the gain to which the receiver is set. A DC offset in the signal is canceled by setting the DC offset cancellation loop to the selected DC offset correction value.
    Type: Grant
    Filed: February 1, 2011
    Date of Patent: January 28, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Rony Ashkenazi, Alexander Zaslavsky, Gregory Uehara, Brian Brunn
  • Patent number: 8634450
    Abstract: An efficient coding and modulation system for transmission of digital data over plastic optical fibers is disclosed. The digital signal is coded by a three-level coset coding. The spectral efficiency of the system is configurable by selecting the number of bits to be processed in each of the levels. The first level applies to the digital data a binary BCH coding and performs coset partitioning by constellation mapping and lattice transformations. Similarly, second level applies another binary BCH coding, which may be performed selectably in accordance with the desired configuration by two BCH codes with substantially the same coding rate, operating on codewords of different sizes. The third level is uncoded. The second and third levels undergo mapping and lattice transformation. After an addition of the levels, a second-stage lattice transformation is performed to obtain a zero-mean constellation. The symbols output from such three-level coset coder are then further modulated.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: January 21, 2014
    Assignee: Knowledge Development for POF, S.L.
    Inventors: Carlos Pardo Vidal, Rúben Pérez de Aranda Alonso
  • Patent number: 8620254
    Abstract: The present invention is directed to a wireless communications device that includes an antenna configured to receive an RF signal from an ambient environment. The antenna is characterized by an antenna impedance and the RF signal is characterized by a predetermined frequency. A passive mixer assembly is coupled to the antenna without an RF matching network. The passive mixer assembly is characterized by a passive mixer impedance presented to the antenna. The passive mixer assembly includes a plurality of baseband mixer ports. The passive mixer assembly is configured to downconvert the RF signal and provide a plurality of baseband signals. Each baseband signal of the plurality of baseband signals is directed out of a corresponding port of the plurality of baseband mixer ports and characterized by a predetermined phase of a plurality of predetermined phases. A baseband low noise amplifier (baseband-LNA) assembly is coupled to the passive mixer assembly.
    Type: Grant
    Filed: February 3, 2011
    Date of Patent: December 31, 2013
    Assignee: Cornell University
    Inventors: Alyosha Molnar, Caroline Andrews
  • Patent number: 8619895
    Abstract: Disclosed are a method and an apparatus for transmitting and receiving broadcast data in a digital broadcasting system. The method for transmitting and receiving broadcast data in a digital broadcasting system includes receiving the main data encoded with symbols having a plurality of levels; deciding whether levels of main data symbols encoded with symbols having the plurality of levels belong to a first group; and mapping the main data symbols to extended levels by using modulation values of the additional data if it is decided that the levels of the main data symbols belong to the first group.
    Type: Grant
    Filed: August 17, 2011
    Date of Patent: December 31, 2013
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jae-Hyun Seo, Sung-Ik Park, Ho-Min Eum, Hyoung-Soo Lim, Heung-Mook Kim, Soo-In Lee
  • Patent number: 8620253
    Abstract: An apparatus and method of compensating for a direct voltage offset in a direct conversion receiver of a wireless communications system is provided.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: December 31, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kwang Lee, Byung Ki Han, Si Bum Jun
  • Patent number: 8605822
    Abstract: A data transmitting apparatus performs symbol mapping on each of first and second input data to generate a plurality of first and second modulation data symbols, performs inverse fast Fourier transform (IFFT) on the plurality of first and second modulation data symbols to convert the same into first and second real signals of a time domain from a frequency domain, angle-modulates the first and second real signals, and transmits the same to a data receiving apparatus. Thus, a peak-to-average power ratio (PAPR) can be lowered, while the same data transfer amount as that of the general OFDM data transmitting apparatus is maintained.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: December 10, 2013
    Assignee: Electronics & Telecommunications Research Institute
    Inventor: Jong Soo Lim
  • Patent number: 8606215
    Abstract: A radio device and a method to operate a non-heterodyne receiver are provided. The radio device is configured to receive a signal waveform and to provide a wake-up signal to a second communication circuit when the signal waveform is a valid communication request; wherein the second communication circuit switches from a power saving state to an operating state upon receiving the wake-up signal from the non-heterodyne receiver. The non-heterodyne receiver further including an Electromagnetic interference (EMI) rejection circuit, including a narrow band filter and a broadband filter to reject an EMI signal. A filter circuit for a narrow passband circuit is also provided. The filter including a buffer circuit; a crystal oscillator coupled to the output of the buffer circuit; and an inverting amplifier coupled in parallel to the crystal oscillator.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: December 10, 2013
    Assignee: SecureALL Corporation
    Inventor: Arun Kumar Sharma
  • Patent number: 8571152
    Abstract: The present invention discloses an apparatus and method for power-saving switch on a pair of configurable analog-to-digital converters. The apparatus mainly comprises an antenna, an antenna switch, a zero-IF RF receiver, and a baseband demodulator. By using a first and a second control signal to control the ON/OFF states of a plurality of switches and a plurality of stage units in the configurable analog-to-digital converters, and the third control signal to control the ON/OFF states of a plurality of LNA stages and the gain of a plurality VGAs, the power saving of the analog-to-digital converter is easily achieved.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: October 29, 2013
    Assignee: ISSC Technologies Corp.
    Inventors: Jeng-Hong Chen, Chin-Chang Chang, Kuang-Hu Huang, Chih-Ching Huang, Che-Kang Sun, Chun-Yuan Huang
  • Patent number: 8525937
    Abstract: An apparatus for calibrating an audio-visual (AV) signal includes a controller for generating a control signal, a controllable filter for selectively filtering the AV signal in response to the control signal to output either the AV signal or a filtered AV signal; and a calibrator for generating a group of calibrating coefficients according to the filtered AV signal and calibrating the AV signal according to the group of calibrating coefficients.
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: September 3, 2013
    Assignee: MStar Semiconductor, Inc.
    Inventors: Wen Chieh Yang, Ching Fu Lan, Jen Hsing Wang, Yi Hsuan Lai, Chin Fu Ho, Hsin Chuan Kuo, You Tsai Cheng, Tai Lai Tung
  • Patent number: 8509358
    Abstract: The device is used for decoding convolution-encoded reception symbols. In this context, transmission data are modulated with a modulation scheme to form symbols, which are encoded with a transmission filter to form convolution-encoded transmission symbols. A convolution-encoded transmission symbol contains components of several symbols arranged in time succession. These transmission symbols are transmitted via a transmission channel and received as reception symbols. The Viterbi decoder decodes the reception symbols by use of a modified Viterbi algorithm. Before running through the Viterbi decoder, the reception symbols are processed by a state-reduction device, which determines additional items of information relating to possible consequential states of the decoding independently of the decoding through the Viterbi decoder in every state of the decoding. The state-reduction device uses the additional items of information to restrict the decoding through the Viterbi decoder to given consequential states.
    Type: Grant
    Filed: August 22, 2008
    Date of Patent: August 13, 2013
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventor: Claudiu Krakowski
  • Patent number: 8483644
    Abstract: The component, fully integrated onto a monolithic substrate, includes a tuner, a demodulator, and a channel decoder. The overall filtering is carried out in two parts, a baseband analog filtering and a digital Nyquist filtering removing the information of adjacent channels. It outputs a stream of MPEG data.
    Type: Grant
    Filed: May 17, 2002
    Date of Patent: July 9, 2013
    Assignee: STMicroelectronics SA
    Inventors: Pierre Busson, Bernard Louis-Gavet, Pierre-Olivier Jouffre
  • Patent number: 8478220
    Abstract: Embodiments of a radio frequency (RF) circuit provide translational filtering in accordance with an input impedance response that is an impedance image of a reactive circuit impedance response from a polyphase reactive circuit. The RF circuit may include a first mixer circuit that provides a first frequency offset for the impedance image and a second mixer circuit that provides an additional frequency offset. Accordingly, the second mixer circuit may allow for adjustments to a total frequency offset of the impedance image. The second mixer circuit may also be configured so that the impedance image rejects a negative frequency impedance response of the reactive circuit impedance response.
    Type: Grant
    Filed: March 16, 2011
    Date of Patent: July 2, 2013
    Assignee: RF Micro Devices, Inc.
    Inventors: Stephen Allott, Thomas Gregory McKay
  • Patent number: 8478222
    Abstract: Systems and methodologies are described that facilitate calibration techniques for a station in a wireless communication system that can be utilized to provide joint estimates for distortion introduced by in-phase and quadrature (I/Q) imbalance and mixing-product modulated images.
    Type: Grant
    Filed: January 2, 2008
    Date of Patent: July 2, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: Klaas Wortel, Rainer Gaethke, Vincent K. Jones, James Gardner
  • Patent number: 8463211
    Abstract: An RF signal receiving apparatus includes a first poly-phase filter, a second poly-phase filter, a first frequency-mixer module, a switch and a low-pass filter module. The first poly-phase filter receives an RF input signal and produces a filtered RF signal according to the received RF input signal. The first frequency-mixer module conducts frequency-mixing operation on a reduced-frequency signal and the filtered RF signal to produce a plurality of reduced-frequency RF signals. The switch receives and transmits the reduced-frequency RF input signal to a first channel or a second channel according to a selection signal. The second poly-phase filter receives the reduced-frequency RF signal transmitted by the second channel and filters the received signal.
    Type: Grant
    Filed: November 24, 2009
    Date of Patent: June 11, 2013
    Assignee: Novatek Microelectronics Corp.
    Inventor: Tung-Ming Su
  • Patent number: 8463217
    Abstract: A MIMO transceiver integrated circuit (IC) includes a plurality of multiple band direct conversion transmitter sections, a plurality of multiple band direct conversion receiver sections, and a local oscillation generation module. Each of the plurality of multiple band direct conversion transmitter sections includes a transmit baseband module and a multiple frequency band transmission module. Each of the plurality of multiple band direct conversion receiver sections includes a multiple frequency band reception module and a receiver baseband module. The local oscillation generation module is operably coupled to generate the first frequency band local oscillation when the multiple band MIMO transceiver IC is in a first mode and operably coupled to generate the second frequency band local oscillation when the multiple band MIMO transceiver IC is in a second mode.
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: June 11, 2013
    Assignee: Broadcom Corporation
    Inventor: Arya Reza Behzad
  • Patent number: 8463227
    Abstract: In a receiver, a synchronization circuit (MIX2, C1, R1, VCO) provides a set of oscillator signals (OSI, OSQ, OSX, OSY) that are synchronized with a carrier of an amplitude-modulated signal. The set of oscillator signals (OSI, OSQ, OSX, OSY) comprises a first amplitude-demodulation oscillator signal (OSX) and a second amplitude-demodulation oscillator signal (OSY) that differ in phase. A first amplitude-demodulation mixer (MIX3) mixes the first amplitude-demodulation oscillator signal (OSX) with the amplitude-modulated signal so as to obtain a first amplitude-demodulated signal (MO3). A second amplitude-demodulation mixer (MIX4) mixes the second amplitude-demodulation oscillator signal (OSY) with the amplitude-modulated signal so as to obtain a second amplitude-demodulated signal (MO4). A magnitude comparator (MDT1, MDT2, DDT) compares respective magnitudes (M+, M?) of the first amplitude-demodulated signal (MO3) and the second amplitude-demodulated signal.
    Type: Grant
    Filed: July 20, 2006
    Date of Patent: June 11, 2013
    Assignee: NXP B.V.
    Inventor: Rob Fortuin
  • Patent number: 8442171
    Abstract: Embodiments of the present invention provide systems, devices and methods for modeling and correcting amplitude and quadrature phase errors generated within analog components of a receiver. A frequency-dependent correction method is employed that closely tracks the frequency dependent nature of the mismatch between the I and Q polyphase filter responses. In particular, digital correction is performed on a signal based on a modeled error function generated during a calibration of the receiver.
    Type: Grant
    Filed: September 27, 2011
    Date of Patent: May 14, 2013
    Assignee: Maxim Integrated Products, Inc.
    Inventor: Charles John Razzell
  • Patent number: 8433276
    Abstract: A sampling circuit and a receiver with which filter characteristics compatible with the reception of wideband signals can be realized with a high degree of freedom in the setting of the filter characteristics. More specifically, the sampling circuit is capable of removing adjacent interfering wave signals while keeping in-band deviation small. The sampling circuit is equipped with a discrete-time analog processing circuit group, wherein multiple discrete-time analog processing circuits are connected in parallel, a synthesizer that synthesizes the output signals from each of the circuit systems and outputs same, and a digital control unit that outputs control signals. Each of the discrete-time analog processing circuits is configured to include multiple rotate capacitor units, which each includes a main rotate capacitor and a sub-rotate capacitor, and only the main rotate capacitors share electric charge with a buffer capacitor included in the synthesizer.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: April 30, 2013
    Assignee: Panasonic Corporation
    Inventor: Yohei Morishita
  • Patent number: 8433277
    Abstract: According to one embodiment, a radio frequency receiver comprises a quadrature mixer configured to convert radio frequency signals to baseband signals or intermediate frequency signals. The quadrature mixer comprises an in-phase passive mixer and a quadrature-phase passive mixer. Each passive mixer comprises a mixer core having a plurality of mixer input switch transistors and a plurality of output switch transistors connected to the mixer input switch transistors. Clock circuitry generates a plurality of quadrature pulsed clock signals and delayed versions of the quadrature pulsed clock signals. The quadrature pulsed clock signals and the delayed versions of the quadrature pulsed clock signals drive the mixer input switch transistors and the output switch transistors.
    Type: Grant
    Filed: April 23, 2008
    Date of Patent: April 30, 2013
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Mu Fenghao, Tillman Fredrik
  • Patent number: 8428532
    Abstract: In the receive subsystem, the analogue-to-digital converter (40) works on the output of the low-noise amplifier (33), at a chosen rate (F), which corresponds to a bandwidth sampling. The processing stages comprise a custom circuit (5), with * an input memory (510) arranged to contain N successive digital samples, renewed at the chosen rate in blocks of M samples, * a complex digital low-pass filtering function (511, 512), of chosen cut-off frequency, operating on the input memory to supply N filtered digital samples (515), * an M-periodic summing function (531) on the N filtered digital samples, supplying M filtered and summed digital samples (533), * an M?M discrete Fourier transform stage (55), operating on these M filtered and summed digital samples, the digital signals on the M outputs (559) of the Fourier transform representing M separate channels, of width defined by the cut-off frequency of the abovementioned low-pass filter.
    Type: Grant
    Filed: April 10, 2008
    Date of Patent: April 23, 2013
    Assignee: Universite Pierre et Marie Curie (Paris VI)
    Inventors: Olivier Romain, Bruce Denby, Julien Denoulet