Hum Or Noise Or Distortion Bucking Introduced Into Signal Channel Patents (Class 330/149)
  • Patent number: 10658982
    Abstract: Apparatus and method for dynamically linearizing multi-carrier power amplifiers. In one example, the method includes storing a correction set including a plurality of correction solutions and loading the correction set into an RF power amplifier linearizer. The method includes determining a first carrier configuration of an RF transmitter during a first timeslot of operation of the RF transmitter and sending a first correction solution index to the RF power amplifier linearizer. The first correction solution index corresponds to a first correction solution of the plurality of correction solutions. The method also includes determining that a carrier configuration change is initiated to operate the RF transmitter with a second carrier configuration during a second timeslot of operation of the RF transmitter and sending a second correction solution index to the RF power amplifier linearizer. The second correction solution index corresponds to a second correction solution of the plurality of correction solutions.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: May 19, 2020
    Assignee: MOTOROLA SOLUTIONS, INC.
    Inventors: Dennis M. Drees, Mitchell R. Blozinski, Rodney W. Hagen
  • Patent number: 10659124
    Abstract: A multiantenna communication device forms a directional beam by adding an antenna weight to respective signals of a plurality of antenna elements. The multiantenna communication device includes: a processor that executes performing distortion compensation on a transmission signal by using a distortion compensation coefficient; a plurality of power amplifiers that are provided corresponding to the antenna elements, and that amplify the transmission signal subjected to the distortion compensation by the processor; a multiplexer that multiplexes signals output from the power amplifiers to feed back; and an analog/digital (A/D) converter that A/D converts a multiplex feedback signal that is obtained by the multiplexer, wherein the processor executes updating the distortion compensation coefficient by using the multiplex feedback signal A/D converted by the A/D converter and the transmission signal.
    Type: Grant
    Filed: February 27, 2019
    Date of Patent: May 19, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Takenori Ohshima, Yoji Ohashi, Hiroyoshi Ishikawa, Atsushi Honda, Toru Maniwa, Alexander Nikolaevich Lozhkin, Toshio Kawasaki, Yuichi Utsunomiya, Tomoya Ota
  • Patent number: 10652057
    Abstract: An all digital outphasing transmitter includes, at least one decomposition unit for decomposing an input signal to generate a first sub-signal and a second sub-signal; at least one outphasing signal generator to convert said first sub-signal to an outphasing signal; at least one delta sigma modulator to convert said second sub-signal to a delta sigma modulated signal; at least one mixing unit for mixing the outphasing signal and delta sigma modulated signal to generate a first and second mixed signal; at least one first amplifier for amplifying the first mixed signal; at least one second amplifier for amplifying the second mixed signal; at least one combiner for combining the first and second amplified mixed signals to generate a delta sigma modulated output signal and at least one band pass filter for filtering the delta sigma modulated output signal to recover the input signal envelope back on to the output signal.
    Type: Grant
    Filed: December 28, 2017
    Date of Patent: May 12, 2020
    Assignee: ASELSAN ELEKTRONIK SANAYI VE TICARET ANONIM SIRKETI
    Inventor: Bulent Sen
  • Patent number: 10644658
    Abstract: The present disclosure relates to an apparatus and a method for transmitting a signal using a power amplifier in a wireless communication system in which a transceiver comprises a digital pre-distorter configured to distort an input signal based on a distortion control value, a power amplifier configured to amplify an output signal from the digital pre-distorter, an antenna configured to transmit an output signal from the power amplifier, an echo signal canceller configured to remove an echo signal which returns to the power amplifier due to a return loss of a path between the power amplifier and the antenna, from a feedback signal obtained at an output stage of the power amplifier, and a digital pre-distortion adaptation unit configured to determine the distortion control value based on an output signal from the echo signal canceller.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: May 5, 2020
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Munwoo Lee, Youngyoon Woo, Martynovich Pavel, Jaebum Kim, Donggeun Lee, Sungchul Hong
  • Patent number: 10637490
    Abstract: Method and apparatus for nonlinear signal processing include mitigation of outlier noise in the process of analog-to-digital conversion and adaptive real-time signal conditioning, processing, analysis, quantification, comparison, and control. Methods, processes and apparatus for real-time measuring and analysis of variables include statistical analysis and generic measurement systems and processes which are not specially adapted for any specific variables, or to one particular environment. Methods and corresponding apparatus for mitigation of electromagnetic interference, for improving properties of electronic devices, and for improving and/or enabling coexistence of a plurality of electronic devices include post-processing analysis of measured variables and post-processing statistical analysis.
    Type: Grant
    Filed: April 15, 2019
    Date of Patent: April 28, 2020
    Inventor: Alexei V. Nikitin
  • Patent number: 10637450
    Abstract: A frequency multiplier (200) generates an output signal with a frequency 3 times of the input signal frequency. The frequency multiplier (200) comprises four cascaded stages. A first stage (201) is configured to receive an input signal and generate harmonics signals of the input signal. A second stage (202) is a passive filter, a frequency response of the passive filter has either a peak or a dip around an upper frequency end of a frequency band of the input signal. A third stage (203) is configured to mix the 1st and the 2nd order harmonics signals to generate 3rd order harmonic signals. A fourth stage (204) is configured to suppress the 1st and even-order harmonics signals and output a signal dominated with a frequency 3 times of the input signal frequency.
    Type: Grant
    Filed: February 3, 2017
    Date of Patent: April 28, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Mingquan Bao
  • Patent number: 10624606
    Abstract: An ultrasound diagnostic apparatus according to a present embodiment includes driving pulse generating circuitries and a transmission control circuitry. The transmission control circuitry turns on a switching element of respective driving pulse generating circuitries of the driving pulse generating circuitries to be grounded, and thereby controls so as to make an output impedance of the respective driving pulse generating circuitries become a low impedance. The transmission control circuitry turns off the switching element of the respective driving pulse generating circuitries, and thereby controls so as to make the output impedance become a high impedance by means of a resistance value of the resistance.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: April 21, 2020
    Assignee: Canon Medical Systems Corporation
    Inventors: Wataru Kameishi, Hiroyuki Shibanuma, Satoshi Kamiyama, Masaaki Ishitsuka, Tomohiro Fujita, Teruki Hagihara, Shuta Fujiwara
  • Patent number: 10581469
    Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for correcting distortion of radio signals A transmit radio signal corresponding to an output of a transmitting radio signal processing system is obtained. A pre-distorted radio signal is then generated by processing the transmit radio signal using a nonlinear pre-distortion machine learning model. The nonlinear pre-distortion machine learning model includes model parameters and at least one nonlinear function to correct radio signal distortion or interference. A transmit output radio signal is obtained by processing the pre-distorted radio signal through the transmitting radio signal processing system. The transmit output radio signal is then transmitted to one or more radio receivers.
    Type: Grant
    Filed: April 17, 2018
    Date of Patent: March 3, 2020
    Assignee: DeepSig Inc.
    Inventors: Timothy James O'Shea, James Shea
  • Patent number: 10581471
    Abstract: An electronic transmitter includes: a generator circuit to generate a baseband signal; a modulator circuit to modulate a carrier signal with the baseband signal; an emitter to emit the modulated signal at an intended recipient; and a distortion circuit to apply a final distortion to the baseband signal or the modulated signal. The final distortion is optimized to minimize the ability of unintended recipients to localize the emitter using correlation-based techniques, and to minimize any degradation to the data rate of the emitted signal at the intended recipient. In some cases, the transmitter is part of an electronic communication system that also includes a receiver at the intended recipient. The receiver is aware of the final distortion and includes a collector to collect the emitted signal, and a demodulator circuit to demodulate the collected signal using the final distortion to recover the baseband signal.
    Type: Grant
    Filed: October 29, 2018
    Date of Patent: March 3, 2020
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Jonathan P. Beaudeau, Prabahan Basu, David J. Couto, William D. Watson
  • Patent number: 10574192
    Abstract: A linearization circuit that reduces intermodulation distortion in an amplifier output receives a first signal that includes a first frequency and a second frequency and generates a difference signal having a frequency approximately equal to the difference of the first frequency and the second frequency. The linearization circuit generates an envelope signal based at least in part on a power level of the first signal and adjusts a magnitude of the difference signal based on the envelope signal. When the amplifier receives the first signal at an input terminal and the adjusted signal at a second terminal, intermodulation between the adjusted signal and the first signal cancels at least a portion of the intermodulation products that result from the intermodulation of the first frequency and the second frequency.
    Type: Grant
    Filed: December 19, 2018
    Date of Patent: February 25, 2020
    Assignee: Skyworks Solutions, Inc.
    Inventors: Yu Zhu, Boshi Jin, Steven Christopher Sprinkle, Florinel G. Balteanu, Oleksiy Klimashov, Dylan Charles Bartle, Paul T. DiCarlo
  • Patent number: 10574280
    Abstract: Embodiments of the present application disclose a passive intermodulation suppression method and a passive intermodulation suppression system. The method in the embodiments of the present application includes: obtaining, by using a target uplink controllable gain module, a first power Pt of an uplink signal sent by an antenna; obtaining a second power Pb of a signal that is output from an output port of a base station; configuring a target attenuation of the base station; and adjusting the initial gain value based on the target attenuation to keep a gain of the base station constant. According to the method described in the embodiments, the base station can maintain the target attenuation constant in a process of adjusting a gain of the target uplink controllable gain module, thereby reducing a PIM requirement of a passive intermodulation suppression system.
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: February 25, 2020
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Lanping Gong, Lianghong Xiang, Weihong Xiao
  • Patent number: 10554183
    Abstract: A DPD operates at a sampling rate at which the input signal not up sampled at an upstream of the DPD is sampled. The DPD includes a polynomial structure comprising a pseudo-interpolation and sub-sample shift processing unit configured to pseudo-interpolate a sample point between the sample points of the input signal and shift the pseudo-interpolated sample point by a sub-sample, and an FIR (Finite Impulse Response) filter disposed at a downstream of the polynomial structure and including a sub-sample delay filter configured to delay the sample point of the input signal by the sub-sample. The DPD uses the polynomial structure and the FIR filter to compensate distortion by the sample point of the input signal and also compensate distortion by a sub-sample point between the sample points of the input signal for the digital predistorter.
    Type: Grant
    Filed: January 10, 2019
    Date of Patent: February 4, 2020
    Assignee: NEC CORPORATION
    Inventor: Yoshiaki Doi
  • Patent number: 10554245
    Abstract: A telecommunications system may include a distortion cancellation subsystem for use with a circulator device coupling an antenna to a transmit path and a receive path. The distortion cancellation subsystem may include a correction circuit and a cancellation circuit. In some aspects, the correction circuit may include a processing device or adaptive filter to correct imperfections in transmit signal samples generated by directional couplers. The correction circuit may also include a summing device to remove receive signal components from the transmit signal samples. The cancellation circuit may receive the output signal of the correction circuit via an adaptive filter. The output of the adaptive filter may be summed with a receive signal to minimize distortion of the receive signal.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: February 4, 2020
    Assignee: Andrew Wireless Systems GmbH
    Inventors: Charles B. Morrison, Gregory Allan Maca
  • Patent number: 10530399
    Abstract: An transmitter arrangement and a method therein are provided for linearization of an active antenna array. The active antenna array comprises a plurality of antenna elements, which are associated with a plurality of power amplifiers. The active antenna array is further associated with a precoder having a number of input and output ports. The method comprises obtaining a first signal provided to the antenna array via a first input port of the precoder. The method further comprises adapting a pre-distorting linearizer connected to the first input port based on the first signal and on feedback from the plurality of antenna elements, resulting from the propagation of the first signal via the precoder, and via the plurality of power amplifiers. Embodiments are also provided for adapting a pre-distorting linearizer based on a plurality of input signals and feedback from the plurality of antenna elements.
    Type: Grant
    Filed: November 27, 2015
    Date of Patent: January 7, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Bernt Johansson, Farshid Ghasemzadeh, Jan-Erik Thillberg, Leonard Rexberg
  • Patent number: 10530310
    Abstract: Digital pre-distortion may be provided. First, a radio frequency (RF) domain distortion correcting signal and a base band (BB) domain distortion correcting signal may be initialized. Then the RF domain distortion correcting signal may be generated from an input signal. The generated RF domain distortion correcting signal may correspond to an amplifier. Next, the BB domain distortion correcting signal may be generated from the input signal. The generated BB domain distortion correcting signal may correspond to the amplifier. Then the RF domain distortion correcting signal and the BB domain distortion correcting signal may be combined to form a hybrid distortion correcting signal. The hybrid distortion correcting signal may then be provided to input matching circuitry feeding the amplifier.
    Type: Grant
    Filed: April 19, 2018
    Date of Patent: January 7, 2020
    Assignee: Cisco Technology, Inc.
    Inventors: Hang Jin, John T. Chapman
  • Patent number: 10505581
    Abstract: The invention relates to an electrical circuit (1) for transmitting a useful analogue signal which has a signal transmission path (16) with an input path (2) and an output path (3) and one or more switches (4-6), with which switch or switches the useful signal which is carried on the input path (2) can be connected through to the output path (3) by the switch or the switches (4-6) being switched to the switched-on state. According to the invention, the electrical circuit (1) comprises a compensation circuit (7) which has one or more auxiliary switches (17) of the same type as the switch or the switches (4-6), and the auxiliary switch or switches (17) is or are coupled to the signal transmission path (16) such that said auxiliary switch or switches generates or generate signal distortion in the switched-on state, which signal distortion substantially compensates for a distortion in the useful analogue signal which is generated by the switch or switches (4-6).
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: December 10, 2019
    Inventor: Thomas Meier
  • Patent number: 10503122
    Abstract: Systems and methods are described for determining a phase measurement difference between a received modulated signal and a local clock signal. An adjusted local clock phase measurement may be determined by subtracting, from the phase measurement difference, a phase correction that is based on the frequency difference between the modulator signal's carrier frequency and the local clock's frequency. A phase modulation value may be generated by scaling the adjusted local clock phase measurement. The scaling may be based on a ratio of the modulated signal's carrier frequency and the local clock's frequency. The phase correction may be based on (i) a count of periods of the modulated signal occurring between each corrected phase measurement and (ii) a difference between the carrier frequency and the local clock frequency.
    Type: Grant
    Filed: October 22, 2018
    Date of Patent: December 10, 2019
    Assignee: Innophase, Inc.
    Inventor: Nicolo Testi
  • Patent number: 10498372
    Abstract: Various examples are directed to systems and methods for digital predistortion (DPD). A linear digital predistortion (DPD) circuit may be programmed to generate a pre-distorted signal linear component based at least in part on a complex baseband signal. A nonlinear DPD circuit may be programmed to generate a pre-distorted signal nonlinear component based at least in part on the complex baseband signal. A mixer circuit programmed to generate a pre-distorted signal based at least in part on the pre-distorted signal linear component and the pre-distorted signal nonlinear component.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: December 3, 2019
    Assignee: Analog Devices Global
    Inventor: Patrick Pratt
  • Patent number: 10491175
    Abstract: A power amplifier apparatus supporting reverse intermodulation product (rIMD) cancellation is provided. The power amplifier apparatus includes an amplifier circuit configured to amplify and output a radio frequency (RF) signal for transmission via an antenna port. The antenna port may receive a reverse interference signal, which may interfere with the RF signal to create a rIMD(s) that can fall within an RF receive band(s). A reverse coupling circuit is provided in the power amplifier apparatus to generate an interference cancellation signal based on the reverse interference signal. The amplifier circuit is configured to amplify the interference cancellation signal and the RF signal to create an intermodulation product(s) to suppress the rIMD(s) to a determined threshold. By suppressing the rIMD(s) in the power amplifier apparatus, it is possible to support concurrent transmissions and receptions in a number of RF spectrums while in compliance with stringent regulatory spurious emissions (SEM) requirements.
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: November 26, 2019
    Assignee: Qorvo US, Inc.
    Inventors: Marcus Granger-Jones, Dirk Robert Walter Leipold, Nadim Khlat
  • Patent number: 10491443
    Abstract: A method for wireless communication includes allocating a transmission bandwidth for transmission to a user equipment (UE). The method further includes determining if the allocated transmission bandwidth is less than or equal to a maximum estimated BWDPD. The maximum estimated BWDPD is the maximum estimated signal bandwidth that a transmitter is configured to digitally pre-distort. The method also includes digitally pre-distorting transmit signals and transmitting the digitally pre-distorted transmit signals to the UE if the allocated transmission bandwidth is less than or equal to the maximum estimated BWDPD. The method also includes transmitting to the UE without digitally pre-distorting the signals if the allocated transmission bandwidth is not less than or equal to the maximum estimated BWDPD. The method also includes applying digital crest factor reduction to the transmit signals if the allocated transmission bandwidth is less than or equal to the maximum estimated BWCFR.
    Type: Grant
    Filed: August 21, 2018
    Date of Patent: November 26, 2019
    Assignee: Phazr, Inc.
    Inventors: Farooq Khan, Sidharth Balasubramanian
  • Patent number: 10483839
    Abstract: A semiconductor device according to an embodiment includes: a first capacitor having a first end and a first the other end, the first end for electrically connecting to at least one of a first electrode and a second electrode of a transistor having the first electrode, the second electrode, and a gate electrode; a first diode having a first anode and a first cathode, the first anode electrically connected to the first the other end; a second capacitor having a second end and a second the other end, the second end electrically connected to the first cathode; a sample and hold circuit electrically connected to the first cathode and the second end; a switch electrically connected in parallel with the second capacitor between the second end and the second the other end; and a second diode having a second anode and a second cathode, the second cathode electrically connected to the first the other end and the first anode.
    Type: Grant
    Filed: February 14, 2018
    Date of Patent: November 19, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Kentaro Ikeda
  • Patent number: 10475440
    Abstract: There is provided an apparatus and a method for rapidly extracting a target sound from a sound signal where a variety of sounds are mixed generated from a plurality of the sound sources. There is a voice recognition unit including a tracking unit for detecting a sound source direction and a voice segment to execute a sound source extraction process, and a voice recognition unit for inputting a sound source extraction result to execute a voice recognition process. In the tracking unit, a segment being created management unit that creates and manages a voice segment per unit of sound source sequentially detects a sound source direction, sequentially updates a voice segment estimated by connecting a detection result to a time direction, creates an extraction filter for a sound source extraction after a predetermined time is elapsed, and sequentially creates a sound source extraction result by sequentially applying the extraction filter to an input voice signal.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: November 12, 2019
    Assignee: SONY CORPORATION
    Inventor: Atsuo Hiroe
  • Patent number: 10476540
    Abstract: Circuitry and methods are described for digital signal demodulation. In a configurable receiver, a method includes receiving a radio frequency signal at the configurable receiver, operating the configurable receiver in a first mode, the first mode including providing the radio frequency signal to an amplitude detection circuit to determine an amplitude, providing the radio frequency signal to a phase detection circuit to determine a phase, and providing the amplitude and phase to a coordinate rotation digital computer (CORDIC) logic circuit, and operating the configurable receiver in a low power mode upon receiving an indication to selectively disable the amplitude detection circuit, the low power mode including providing the radio frequency signal to the phase detection circuit to determine the phase, and providing the phase and a predetermined constant value in lieu of the amplitude to the CORDIC logic circuit.
    Type: Grant
    Filed: October 15, 2018
    Date of Patent: November 12, 2019
    Assignee: Innophase, Inc.
    Inventors: Yang Xu, Sara Munoz Hermoso
  • Patent number: 10476645
    Abstract: A radio communication apparatus is disclosed that enables the influence of the feedback information on the channel capacity to be kept to the minimum without reducing the transmission efficiency of information by transmission of pilot symbol. In the apparatus, a delay dispersion measuring section generates a delay profile using the received signal, and measures delay dispersion indicative of dispersion of delayed versions. A moving speed estimating section estimates moving speed of a mobile station apparatus that transmits a pilot symbol based on the variation in reception power of the pilot symbol. An other-cell interference measuring section measures other-cell interference caused by signals transmitted in cells except the cell to which the apparatus belongs.
    Type: Grant
    Filed: November 21, 2016
    Date of Patent: November 12, 2019
    Assignee: Godo Kaisha IP Bridge 1
    Inventors: Akihiko Nishio, Atsushi Matsumoto
  • Patent number: 10461706
    Abstract: In examples, a system comprises a differential amplifier coupled to a parasitic capacitor positioned between a first node and a first reference voltage source. The system comprises a buffer amplifier having an input terminal and an output terminal, the input terminal coupled to the first node and the output terminal coupled to a cancellation capacitor. The system includes a controlled current source coupled to the first node and the input terminal, the controlled current source coupled to a second reference voltage source. The system comprises a current sense circuit coupled to the cancellation capacitor and the second reference voltage source.
    Type: Grant
    Filed: April 30, 2018
    Date of Patent: October 29, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Steven G. Brantley, Bharath Karthik Vasan, Srinivas K. Pulijala, Martijn Snoeij
  • Patent number: 10454427
    Abstract: A Digital Power-Amplifier (DPA) system includes a power amplifier (PA) circuit having control inputs and an output for generating output signals, and an adaptive control circuit that comprises an input interface, an output interface, a memory storing an adaptive control algorithm and a processor performing instructions based on the adaptive control algorithm in connection with the memory, wherein the input interface receives input-state signals and output signals of the DPA circuit, wherein the adaptive control algorithm determines, in response to the input-state signals and the output signals, control parameters of control signals transmitted to the control inputs from the output interface for controlling operations of the DPA circuit.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: October 22, 2019
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Rui Ma, Mouhacine Benosman, Koushik Manjunatha, Sufeng Niu, Daniel Antonio Da Costa Dinis
  • Patent number: 10447214
    Abstract: The present invention provides an amplifier circuit for amplifying an incoming signal, the amplifier circuit comprising at least two signal paths configured to amplify signals of different overlapping frequency bands, a signal splitter comprising an input port configured to receive the incoming signal, the signal splitter being coupled to an input side of the signal paths and configured to split the incoming signal into split signals for the signal paths, and a diplexer coupled to an output side of the signal paths and configured to combine the amplified signals and provide a combined amplified signal. Further, the present invention provides a respective method.
    Type: Grant
    Filed: January 3, 2018
    Date of Patent: October 15, 2019
    Assignee: ROHDE & SCHWARZ GMBH & CO. KG
    Inventors: Andreas Andrei, Klaus Sauerbier, Marco Witte, Orell Garten, Raimon Goeritz, Uwe Dalisda, Florian Ohnimus, Reimo Dueben
  • Patent number: 10447209
    Abstract: Embodiments of the disclosure generally relate to a method and device for improving the efficiency of a power amplifier. The apparatus comprising: a harmonic generator, configured to generate one or more harmonic according to an output signal of a power amplifier; a harmonic feedback device, configured to inject the harmonic generated by the harmonic generator to an input terminal of the power amplifier; and a harmonic eliminator, configured to eliminate the harmonic in the output signal of the power amplifier. According to embodiments of the disclosure, the efficiency of power amplifier can be improved without degrading the linearity.
    Type: Grant
    Filed: January 26, 2017
    Date of Patent: October 15, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Zhancang Wang
  • Patent number: 10447211
    Abstract: A method and system for digital pre-distortion of an input signal to compensate for non-linear operation of a power amplifier. According to one aspect, some embodiments provide overlapping spline functions that are defined for two adjacent bins, where any two spline functions overlap in only one bin. Each spline function is computed as a function of one of an input signal envelope and a delayed signal envelope. According to another aspect, a tap weight evaluator includes a least mean squares, LMS, tap correlator updater configured to modulate a step size of an adaptation process to update each tap weight, the step size being modulated based on an approximate logarithm of the average power of the input to a tap weight computation.
    Type: Grant
    Filed: June 17, 2015
    Date of Patent: October 15, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Mark Rollins, Arthur T. G. Fuller
  • Patent number: 10416692
    Abstract: A method and apparatus for reducing capacitor noise in electronic systems is disclosed. A system includes at least one functional circuit block coupled to receive a variable supply voltage. The value of the supply voltage is controlled by a power management circuit. Changing a performance state of the functional circuit block includes increasing the supply voltage for higher performance, and reducing the supply voltage for reduced performance demands. The power management circuit, in changing to a higher performance state, increases the supply voltage at a first rate. A rate control circuit causes the power management circuit to reduce the supply voltage, when changing to a lower performance state, at a second rate that is less than the first rate.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: September 17, 2019
    Assignee: Apple Inc.
    Inventors: Jong-Suk Lee, Ramesh B. Gunna, Shih-Chieh Wen
  • Patent number: 10418951
    Abstract: Disclosed are systems and methods related to reducing intermodulation products in an RF output signal by matching an impedance of the power amplifier to an impedance of the antenna and concurrently blocking signals having a second fundamental frequency received by the antenna when the antenna is transmitting to inhibit intermodulation products of the first and second fundamental frequencies from re-radiating from the antenna. The matching and blocking are performed concurrently by a single circuit with combined matching and blocking functionality.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: September 17, 2019
    Assignee: Skyworks Solutions, Inc.
    Inventors: Grant Darcy Poulin, Apostolos Samelis, Edward John Wemyss Whittaker
  • Patent number: 10404334
    Abstract: A 5G base station transmitter at least partially precodes data for beam forming, and generates digital precoded baseband signals. Cross product circuitry coupled to the digital precoder, generates digital cross products of the digital precoded baseband signals. Both the baseband signals and the cross products are put through digital-to-analog converters (DACs), then provided to an analog non-linear precoder. The analog non-linear precoder combines the analog baseband signals, the cross products, with pre-distortion and precoder coefficients to generate a signal that is pre-compensated for power amplifier non-linearity. The pre-compensated signal is amplified by the power amplifier and transmitted via a phased antenna array. The number of extra DACs required for inserting pre-distortion when a hybrid digital/analog precoder is used can be limited to approximately N RF ? ( N RF - 1 ) 2 , where NRF is the number of outputs of the digital precoder.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: September 3, 2019
    Assignee: Maxlinear Asia Singapore PTE LTD
    Inventor: Ronen Shaked
  • Patent number: 10404296
    Abstract: An approach to digital compensation uses a particular structure for a digital pre-distorter (DPD) which acts as a relatively accurate pre-inverse of a non-linear circuit (e.g., a non-linear transmit chain involving digital-to-analog converter (DAC), lowpass filter, modulator, bandpass filter, and power amplifier) while making use of a relatively small number of parameters that characterize the non-linearity and/or parameters that provide accurate linearization without requiring continual updating.
    Type: Grant
    Filed: May 30, 2018
    Date of Patent: September 3, 2019
    Assignee: NanoSemi, Inc.
    Inventors: Helen H. Kim, Alexandre Megretski, Yan Li, Kevin Chuang, Zohaib Mahmood
  • Patent number: 10389362
    Abstract: A frequency calibration device includes an input signal generator configured to generate an input signal based on an oscillation signal and an external signal, an envelope detector configured to detect an envelope signal corresponding to the input signal, and a frequency tuner configured to tune an oscillation frequency of the oscillation signal based on an envelope frequency corresponding to the envelope signal.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: August 20, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Seong Joong Kim, Sang Joon Kim, Jong Pal Kim
  • Patent number: 10382073
    Abstract: An RF transmitter arrangement using analog pre-distortion is disclosed. The arrangement includes lower bandwidth circuitry, an analog pre-distorter, and a non-linear amplifier chain. The lower bandwidth circuitry is configured to generate an analog signal. The analog pre-distorter is configured to apply a non-linear distortion to the analog original signal based on a coupled feedback signal in order to generate an RF output signal. The non-linear amplifier chain is configured to amplify the RF output signal to generate a transmission signal relative to the analog original signal. The coupled feedback signal is derived from the transmission signal.
    Type: Grant
    Filed: November 3, 2015
    Date of Patent: August 13, 2019
    Assignee: Infineon Technologies AG
    Inventors: Peter Singerl, Thomas Magesacher, Martin Mataln
  • Patent number: 10381987
    Abstract: A predistorter has a first capacitor and an impedance conversion circuit. A first end of the first capacitor is coupled to a first node of the amplifier. The impedance conversion circuit is used to perform an impedance conversion to provide a variable capacitance. The impedance conversion circuit has a first bias input circuit and a bipolar junction transistor (BJT). The first bias input circuit is used to receive a first input bias. A base of the BJT is coupled to an output end of the first bias input circuit and a second end of the first capacitor, a collector of the BJT is floating, and an emitter of the BJT is coupled to a second node of the amplifier.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: August 13, 2019
    Assignee: RichWave Technology Corp.
    Inventors: Chih-Sheng Chen, Pei-Chuan Hsieh
  • Patent number: 10374556
    Abstract: Circuits and methods for adjusting one or more operation parameters of a semiconductor device. One example of a circuit includes a first semiconductor device, a beta sensing circuit coupled to the first semiconductor device and configured to measure a current gain of the first semiconductor device and generate a first control signal based on a value of the current gain of the first semiconductor device, and a reference control circuit coupled to the beta sensing circuit and configured to receive the first control signal and adjust an operation parameter of the first semiconductor device based on the value of the current gain of the first semiconductor device.
    Type: Grant
    Filed: August 21, 2017
    Date of Patent: August 6, 2019
    Assignee: SKYWORKS SOLUTIONS, INC.
    Inventors: Lui Lam, Andrew Raymond Chen
  • Patent number: 10374656
    Abstract: A same-aperture any-frequency simultaneously transmit and receive (STAR) system includes a signal connector having a first port electrically coupled to an antenna, a second port electrically coupled to a transmit signal path, and a third port electrically coupled to receive signal path. The signal connector passes a transmit signal in the transmit signal path to the antenna and a receive signal in the receive signal path. A signal isolator is positioned in the transmit signal path to remove a residual portion of the receive signal from transmit signal path. An output of the signal isolator provides a portion of the transmit signal with the residual portion of the receive signal removed. A signal differencing device having a first input electrically coupled to the output of the signal isolator and a second input electrically coupled to the third port of the signal connector subtracts a portion of the transmit signal in the receive signal path thereby providing a more accurate receive signal.
    Type: Grant
    Filed: July 30, 2013
    Date of Patent: August 6, 2019
    Assignee: Photonic Systems, Inc.
    Inventors: Charles H. Cox, Edward I. Ackerman
  • Patent number: 10368318
    Abstract: Protocols and algorithms for contention-based adaptive modulation networks, typically used in unlicensed bands. A wireless system in which high modulation rate packets are prioritized over low rate packets. The wireless system is configured to process communication signals from plural user portable devices having wireless access points capable of dynamically adjusting access point transmit power on a user-by-user basis to a minimum level required to achieve a target signal-to-noise ratio from each user portable device irrespective of the interference observed on the link is also disclosed. The wireless system is also capable of dynamically adjusting access point transmitter power and receiver sensitivity on a user-by-user basis to a minimum level required to achieve the highest possible modulation rate.
    Type: Grant
    Filed: December 30, 2010
    Date of Patent: July 30, 2019
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Waichi Lo, Roland Smith, Chris Williams, Stephen Rayment, Michael Russell
  • Patent number: 10367461
    Abstract: Disclosed are systems and methods related to reducing intermodulation products in an RF output signal by matching an impedance of the power amplifier to an impedance of the antenna and concurrently blocking signals having a second fundamental frequency received by the antenna when the antenna is transmitting to inhibit intermodulation products of the first and second fundamental frequencies from re-radiating from the antenna. The matching and blocking are performed concurrently by a single circuit with combined matching and blocking functionality.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: July 30, 2019
    Assignee: Skyworks Solutions, Inc.
    Inventors: Grant Darcy Poulin, Apostolos Samelis, Edward John Wemyss Whittaker
  • Patent number: 10361892
    Abstract: A transmitter comprising a power amplifier, a phase modulator, a switched DC-DC converter, all operating in dual mode, and a controller is disclosed. The power amplifier is arranged to selectively operate either in a first mode or in a second mode, wherein the first mode is a linear mode and the second mode is a non-linear mode in order to save power with least increasing cost in hardware. The transmitter is adapted to operate at different allocated bandwidths, for different radio standards while keeping minimum power consumption governed by the controller. A transceiver, a communication device, a method and a computer program are also disclosed.
    Type: Grant
    Filed: April 16, 2018
    Date of Patent: July 23, 2019
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Fenghao Mu, Bengt Lindoff
  • Patent number: 10355650
    Abstract: The present invention addresses method, apparatus and computer program product for controlling a Direct Learning Algorithm. Thereby, a power amplifier operating in a non-linear state is controlled. A signal to be amplified is input to a pre-distorter provided for compensating for non-linearity of the power amplifier. The pre-distorted output signal is forwarded from the pre-distorter to the power amplifier. Parameters of the pre-distorter are adapted in plural steps based on an error between a linearized signal output from the power amplifier and the signal to be amplified using an adaptive direct learning algorithm. It is detected whether the error diverges; and adapting of the parameters of the pre-distorter is stopped when it is determined that the error is diverging.
    Type: Grant
    Filed: February 10, 2015
    Date of Patent: July 16, 2019
    Assignee: Nokia Solutions And Networks GMBH And Co. KG
    Inventors: Rene Roeschke, Shavantha Kularatna, Bjoern Jelonnek, Christian Reichl
  • Patent number: 10333474
    Abstract: A power amplifier system front end measures both forward and reverse power associated with an RF transmit signal. A processor is configured to use measurements derived from the measured forward and reverse power output to adjust the RF transmit signal in order to compensate for one or more memory effects of the power amplifier system.
    Type: Grant
    Filed: May 18, 2015
    Date of Patent: June 25, 2019
    Assignee: Skyworks Solutions, Inc.
    Inventors: Ziv Alon, Maxwell L. Thomas
  • Patent number: 10303814
    Abstract: A method is provided for simulating intermods of a signal including multiple carriers. The method includes receiving parameters of the signal, the parameters including a total number of carriers, a frequency of one carrier and a spacing between adjacent carriers; identifying multiple intermod combinations corresponding to a desired intermod order; and synthesizing multiple intermod envelopes corresponding to the intermod combinations according to multiple predetermined algorithms using at least one of the total number of carriers, the frequency of the one carrier, and the spacing between adjacent carriers. The predetermined algorithms including at least one predetermined algorithm corresponding to each intermod combination of the multiple intermod combinations.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: May 28, 2019
    Assignee: Keysight Technologies, Inc.
    Inventor: Rulon Vandyke
  • Patent number: 10305577
    Abstract: A high-linearity linearizer system includes a multi-stage linearizer circuit formed by cascading multiple linearizer circuits. The multi-stage linearizer circuit is configured to pre-distort an input signal to generate a pre-distorted signal. A non-linear high-power amplifier (HPA) having non-linear characteristics is coupled to the multi-stage linearizer circuit and is configured to amplify the pre-distorted signal. Pre-distortion characteristics of the multi-stage linearizer circuit are configured to counter the non-linear characteristics of the non-linear HPA and to compensate a non-linearity of the non-linear HPA to achieve a desired level of linearity.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: May 28, 2019
    Assignee: Lockheed Martin Corporation
    Inventors: Marc Ronald Bjorkman, Kim Thomas Lancaster, Douglas V. McKinnon, Novellone Rozario, Jason Michael Teixeira
  • Patent number: 10290927
    Abstract: An electronic device includes an antenna, a wireless transmitter, a proximity sensor and a controller. The antenna includes a first radiating element and a second radiating element which has a different length than the first radiating element. The wireless transmitter is to send a radio signal to the antenna and the controller is to disable the first radiating element in response to the proximity sensor detecting a body part.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: May 14, 2019
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Cheng-Fang Lin, Wan-Lin Su, Huai-Yung Yen
  • Patent number: 10277173
    Abstract: Certain aspects of the present disclosure provide methods and apparatus for amplifying signals with an amplification circuit. The amplification circuit generally includes a first transistor, an input path coupled between an input node of the amplification circuit and a control input of the first transistor, and a feedforward path coupled between the input node and a feedforward node. In certain aspects, the amplification circuit may also include a first resistive device coupled between the feedforward node and the control input of the first transistor, a biasing circuit coupled to the feedforward node, and a low-impedance path coupled to the feedforward node.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: April 30, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Joonhoi Hur, Paul Draxler
  • Patent number: 10277261
    Abstract: A distortion compensation apparatus includes: a filtering unit that is provided with a plurality of storing units each of which is capable of storing a signal therein and that filters an input signal by sequentially moving the input signal starting from a storing unit provided on a first stage up to another storing unit provided on a final stage; a calculating unit that calculates a power level of a signal output from a storing unit that is provided on an earlier stage than the storing unit provided on the final stage; an output unit that, on the basis of the power level calculated, outputs a distortion compensation coefficient used for cancelling out non-linear distortion occurring in an amplifier; and a distortion compensation unit that performs a distortion compensation process on a signal output from the storing unit provided on the final stage, by using the distortion compensation coefficient.
    Type: Grant
    Filed: May 29, 2018
    Date of Patent: April 30, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Tomohiro Nakamura, Takanori Iwamatsu
  • Patent number: 10269171
    Abstract: A control system and data acquisition system for an electrical capacitance tomography sensor comprised of a sensor having a plurality of electrodes, where each electrode is further comprised of a plurality of capacitance segments. Each of the capacitance segments of each electrode can be individually addressed to focus the electric field intensity or sensitivity to desired regions of the electrodes and the sensor.
    Type: Grant
    Filed: February 27, 2014
    Date of Patent: April 23, 2019
    Assignee: Tech4Imaging LLC
    Inventors: Qussai Marashdeh, Geoffrey Legg, David Matthews, Mohd Harish
  • Patent number: 10250211
    Abstract: Reducing non-linear distortions of an electronic device by performing at least the following: receiving, at an output stage circuit of an amplifier, an input signal from a previous stage circuit of the amplifier, driving a first subset of output transistors within the output stage circuit with an auxiliary buffer circuit to generate a first half cycle of an output signal Vout, driving a second subset of output transistors within the output stage circuit with the input signal to generate the first half cycle of the output signal Vout, and driving a set of output transistors with the input signal to generate a second half cycle of the output signal Vout, wherein the auxiliary buffer circuit equalizes the overall current gain associated with the first and second subset of output transistors with the overall current gain associated with the set of output transistors.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: April 2, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Ravpreet Singh