Power Amplifier Patents (Class 375/297)
  • Patent number: 11405064
    Abstract: Methods and devices for processing of RF signals according to different gain modes are presented. According to one aspect, an active amplification mode is provided by switchable active paths coupled to respective input RF signals and a passive attenuation mode is provided by switchable passive paths coupled to the respective RF signals. According to another aspect, a common switchable feedback path coupled to the switchable active paths is used to provide an active attenuation mode. Coupling of the common switchable feedback path to the switchable active path is provided by switches of the switchable passive paths, including for coupling both ends of the common switchable feedback path or just one end.
    Type: Grant
    Filed: July 1, 2021
    Date of Patent: August 2, 2022
    Assignee: PSEMI CORPORATION
    Inventors: David Kovac, Joseph Golat
  • Patent number: 11387785
    Abstract: A radio frequency transmitter includes N transmit channels, where each transmit channel includes one nonlinear module, a primary correction circuit, coupled to each of N nonlinear modules that correspond to the N transmit channels, and configured to provide a primary correction signal for the N nonlinear modules, and N secondary correction circuits, where the N secondary correction circuits are coupled to the N nonlinear modules respectively, and each secondary correction circuit is configured to provide a secondary correction signal for a nonlinear module coupled to the secondary correction circuit.
    Type: Grant
    Filed: October 26, 2020
    Date of Patent: July 12, 2022
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Yushan Zheng, Fuquan Zhang, Jinming Wang
  • Patent number: 11381328
    Abstract: Systems, methods, and devices detect variations in load impedances of wireless communications devices. Methods include determining a first distortion measurement of a transceiver based on a first comparison of a digital loopback path and a radio frequency (RF) loopback path, and determining a second distortion measurement of the transceiver based on a second comparison of the digital loopback path and the RF loopback path. Methods also include implementing, using a processor, a third comparison of the first distortion measurement and the second distortion measurement, and determining if there is a change in a load of the transceiver based on the third comparison.
    Type: Grant
    Filed: September 24, 2019
    Date of Patent: July 5, 2022
    Assignee: Cypress Semiconductor Corporation
    Inventors: Vipul Kumar, Raghuram Kuchibhotla
  • Patent number: 11374609
    Abstract: A transceiver in a wireless communication system is provided. The transceiver includes a first circuit configured to convert a digital signal having a third bandwidth, a second circuit configured to separate the analog signal into a first analog signal corresponding to the first band and a second analog signal corresponding to the second band, up-convert the first analog signal and the second analog signal to generate a first radio frequency (RF) signal in the first band and a second RF signal in the second band, and output an RF signal having the third bandwidth, and a third circuit configured to separate the RF signal into the first RF signal and the second RF signal, adjust a phase of the first RF signal for beamforming in the first band, and adjust a phase of the second RF signal for beamforming in the second band.
    Type: Grant
    Filed: October 16, 2020
    Date of Patent: June 28, 2022
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jeongho Lee, Byungjoon Park, Daehyun Kang, Donghyun Lee, Jooseok Lee
  • Patent number: 11349513
    Abstract: The present disclosure relates to an envelope tracking system that is configured to improve the performance of radio frequency power amplifier circuitry by compensating for errors that become more significant as modulation bandwidth increases. These errors include power amplifier collector-base capacitance, time delay between power amplifier stages, and interconnect distance between the baseband modulation source and the power amplifier collector.
    Type: Grant
    Filed: December 18, 2020
    Date of Patent: May 31, 2022
    Assignee: QORVO US, INC.
    Inventors: Terry J. Stockert, Nadim Khlat
  • Patent number: 11323188
    Abstract: Disclosed are implementations, including a method for monitoring a performance of a transmitter in a radio with an adjustable digital predistortion system. The method includes determining a plurality of system characteristics, including determining one or more of, for example, data characterizing an input/output characteristic of a digital predistorter of the system, data characterizing a performance of a crest factor reduction process of the system, data characterizing a quality of a plurality of parameters associated with the digital predistorter, data characterizing an average time delay associated with the system, data characterizing an average gain associated with the system, and/or data characterizing a phase associated with the system. The method further includes comparing one or more of the plurality of system characteristics to respective one or more reference values, and controlling the adjustable digital predistortion system based on a result of the comparing.
    Type: Grant
    Filed: July 12, 2018
    Date of Patent: May 3, 2022
    Assignee: NanoSemi, Inc.
    Inventors: Yan Li, Helen H. Kim, George Stone, IV, Shijun Li
  • Patent number: 11304148
    Abstract: Disclosed are methods and systems for tailoring the transmit power of a wireless device to the parameters of the device such as the process split, voltage, and temperature. The device may identify one or more parameters of the device such as identifying the process split, or sensing the operating voltage or temperature. The device may determine an updated transmit power based on the known parameter values identified and any unknown parameter values. The updated transmit power is determined to be a maximum transmit power that meets one or more target transmit metrics, such as EVM and spectral mask, when the device transmits based on the known parameter values and across a range of variations of the unknown parameter values. The device may adjust its transmit power based on the updated transmit power periodically.
    Type: Grant
    Filed: September 27, 2019
    Date of Patent: April 12, 2022
    Assignee: Cypress Semiconductor Corporation
    Inventors: Ayush Sood, Kamesh Medapalli, Rajendra Kumar Gundu Rao, Patrick Cruise, Roshni Sulekhakumari, Manoj George
  • Patent number: 11293957
    Abstract: Power loss is calculated in an inductive power transfer system comprising a power transmitter for transmitting power inductively to a power receiver via transmitter coil and receiver coil. The power transmitter obtains time information for time alignment to enable the power transmitter to align the time of calculating the power loss with the power receiver. Power loss is calculated during power transfer according to the obtained time information and received power parameter communicated from the power receiver.
    Type: Grant
    Filed: December 19, 2019
    Date of Patent: April 5, 2022
    Assignee: Koninklijke Philips N.V.
    Inventor: Andries Van Wageningen
  • Patent number: 11251819
    Abstract: A transmitter for a communication system comprises a digital pre-distortion (DPD) circuit configured to generate a digital intermediate signal by compensating an input signal for distortions resulting from an amplifier, and an adaptation circuitry configured to update the first parameter based on the adjustment signal, the input signal, and an output signal output by the amplifier and based on the digital intermediate signal. The DPD circuit includes an infinite impulse response filter configured to implement a transfer function based on a first parameter, and thermal tracking circuitry configured to generate an adjustment signal corresponding to a thermal change of the amplifier.
    Type: Grant
    Filed: December 23, 2020
    Date of Patent: February 15, 2022
    Assignee: XILINX, INC.
    Inventors: Hongzhi Zhao, Xiaohan Chen, Hemang Parekh, Vincent C. Barnes
  • Patent number: 11201723
    Abstract: Described herein are apparatus and methods for highly linear phase rotators with continuous rotation. A method includes generating a first code and a second code based on a desired offset to match a first and second frequency, respectively, calibrating the first code and the second code based on first phase rotator characteristics and second phase rotator characteristics, respectively, generating first N phase offset codes and second N phase offset codes from a calibrated first and second code, respectively, wherein each phase offset code constrains functionality of the first phase rotator and the second phase rotator, respectively, associated with a phase of the input clock to a defined region of operation, rotating a clock using the first N phase offset codes and the second N phase offset codes to match the first and second frequency, respectively.
    Type: Grant
    Filed: September 8, 2020
    Date of Patent: December 14, 2021
    Assignee: Ciena Corporation
    Inventors: Jerry Yee-Tung Lam, Sadok Aouini, Naim Ben-Hamida
  • Patent number: 11171655
    Abstract: An EC platform including a controller to control multiple integrated circuits (ICs) to synchronize an operational internal clock signal of an IC with a master clock signal. The controller generates commands for the IC to measure a phase difference or latency difference between an initial internal clock signal of the IC and an input clock signal to the IC from a parent IC. The controller further receives a difference signal from the IC to indicate the phase or latency difference. The IC includes a measurement circuit to measure the phase or latency difference, and to generate a difference signal to indicate the phase or latency difference. The IC further includes a synchronization clock generator to generate, based on the initial internal clock signal and the difference signal, an operational internal clock signal synchronized with the master clock signal. Other embodiments may also be described and claimed.
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: November 9, 2021
    Assignee: Intel Corporation
    Inventors: Oren Shalita, Roy Sofer, Alon Cohen, Sharon Heruti, Natarajan Karthik, Kailash Chandrashekar
  • Patent number: 11169514
    Abstract: Methods and systems for anomaly detection and correction include generating original signature matrices that represent a state of a system of multiple time series. The original signature matrices are encoded using convolutional neural networks. Temporal patterns in the encoded signature matrices are modeled using convolutional long-short term memory neural networks for each respective convolutional neural network. The modeled signature matrices using deconvolutional neural networks. An occurrence of an anomaly is determined using a loss function based on a difference between the decoded signature matrices and the original signature matrices. A corrective action is performed responsive to the determination of the occurrence of the anomaly.
    Type: Grant
    Filed: August 23, 2019
    Date of Patent: November 9, 2021
    Inventors: Dongjin Song, Yuncong Chen, Cristian Lumezanu, Haifeng Chen, Chuxu Zhang
  • Patent number: 11159186
    Abstract: A transmitter circuit is disclosed. The transmitter circuit includes a frequency circuit configured to generate a frequency signal, a power amplifier configured to drive an antenna with a drive signal according to the frequency signal, and a programmable delay circuit configured to controllably extend a propagation delay between the frequency signal generated by the frequency circuit and the drive signal of the power amplifier. The programmable delay circuit is programmed with a programming value which causes the transmitter circuit to pass a calibration test.
    Type: Grant
    Filed: January 9, 2020
    Date of Patent: October 26, 2021
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Ahmed Emira, Faisai Hussien, Esmail Babakrpur Nalousi
  • Patent number: 11082007
    Abstract: An envelope tracking (ET) integrated circuit (IC) (ETIC) is provided. The ETIC includes a number of ET circuits coupled to a number of amplifier circuits configured to amplify a radio frequency signal based on a number of ET voltages, respectively. The ET circuits are configured to generate the ET voltages based on a number of ET target voltages, respectively. The ETIC includes a reference ET circuit configured to generate a reference ET voltage based on a maximum ET target voltage among the ET target voltages. A selected ET circuit(s) among the ET circuits may be configured to not generate a respective ET voltage(s) but instead forward the reference ET voltage to a respective amplifier circuit(s) as the respective ET voltage(s). Hence, it may be possible to partially or completely turn off the selected ET circuit(s) to help reduce peak battery current and improve heat dissipation in an ET amplifier apparatus.
    Type: Grant
    Filed: July 17, 2019
    Date of Patent: August 3, 2021
    Assignee: Qorvo US, Inc.
    Inventor: Nadim Khlat
  • Patent number: 11063620
    Abstract: A transmitter includes a pre-emphasis digital filter configured to filter a series of respective digital input data samples according to a plurality of coefficients to generate a series of respective corresponding pre-emphasized data samples. The transmitter also includes a digital-to-analog converter (DAC) configured to sample the series of pre-emphasized data samples to generate an analog signal and an analog filter configured to filter the analog signal to generate a filtered signal. Estimator circuitry is configured to input a pre-emphasized data sample; input a corresponding sample of the filtered signal; and calculate the plurality of coefficients based on the sample of the filtered signal and the pre-emphasized data sample.
    Type: Grant
    Filed: May 31, 2016
    Date of Patent: July 13, 2021
    Assignee: Apple Inc.
    Inventors: Avi Sulimarski, Oren E. Avraham
  • Patent number: 11038731
    Abstract: Disclosed are crest factor reduction (CFR) implementations that include a method comprising getting communication system data representative of characteristics of a communication system comprising one or more radio transmission bands, and optimizing, based at least in part on the input communication system data, a plurality of updateable parameters that determine respective pulse shapes for one or more pulses as well as other certain algorithm execution parameters for use in the CFR system. Optimizing the plurality of updateable parameters includes iteratively updating the plurality of updateable parameters based on iterative evaluation of a plurality of performance parameters. The method further includes providing the optimized plurality of updateable parameters to configure the crest reduction system for use in processing signals for radio transmission using a pulse subtraction approach applied to one or more signals communicated through the communication system.
    Type: Grant
    Filed: June 8, 2018
    Date of Patent: June 15, 2021
    Assignee: NanoSemi, Inc.
    Inventors: Dmitri Fomin, Alexandre Megretski, Kevin Chuang, Zohaib Mahmood, Yan Li, Helen H. Kim, George Stone
  • Patent number: 11032037
    Abstract: Implementations described herein are directed to satellite transmitters and receivers for applying OFDM-like signaling in broadband satellite transmissions. In such systems, one or more data signals may be shaped and composited into a composite data signal at an OFDM-like transmitter for transmission over a satellite channel. The data signals that are carried over the satellite channel by the composited signal may have their own carrier, and each signal may carry multiple OFDM subcarriers. Further implementations are directed to correcting for distortion in satellite communications systems that utilize OFDM-like signaling.
    Type: Grant
    Filed: January 6, 2020
    Date of Patent: June 8, 2021
    Assignee: HUGHES NETWORK SYSTEMS, LLC
    Inventors: Bassel F. Beidas, Rohit Iyer Seshadri
  • Patent number: 11009597
    Abstract: A radar system includes a transmitter to transmit a sequence of pulses, a receiver to receive reflections of the transmitted pulses, and velocity detection circuitry to determine a velocity of an object in a path of the transmitted pulses based at least in part on the transmitted pulses and the reflected pulses. The transmitter includes a plurality of digital-to-analog converters (DACs) to generate the sequence of pulses in response to a clock signal. The receiver includes a plurality of analog-to-digital converters (ADCs) to sample the reflected pulses in response to the clock signal. Accordingly, the ADCs are locked in phase with the DACs.
    Type: Grant
    Filed: December 17, 2018
    Date of Patent: May 18, 2021
    Assignee: Xilinx, Inc.
    Inventors: Brendan Farley, Christophe Erdmann, Bob W. Verbruggen
  • Patent number: 10972051
    Abstract: A power amplifier circuit includes a first amplifier that amplifies an input signal and outputs an output signal; a second amplifier that, in accordance with a control signal, amplifies a signal corresponding to the input signal, generates a signal having an opposite phase to that of the output signal, and adds the signal to the output signal; and a control circuit that supplies the control signal to the second amplifier. The control circuit outputs the control signal so that during operation of the power amplifier circuit in a first power mode, a gain of the second amplifier is not less than zero and less than a predetermined level and during operation in a second power mode lower than the first power mode in output power level, a gain of the second amplifier is not less than the predetermined level and less than a gain of the first amplifier.
    Type: Grant
    Filed: August 13, 2019
    Date of Patent: April 6, 2021
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Satoshi Tanaka, Satoshi Arayashiki, Kazuo Watanabe
  • Patent number: 10958218
    Abstract: Apparatus and methods for bias switching of power amplifiers are provided herein. In certain configurations, a power amplifier system includes a power amplifier that provides amplification to a radio frequency (RF) signal, a power management circuit that controls a voltage level of a supply voltage of the power amplifier, and a bias control circuit that biases the power amplifier. The power management circuit is operable in multiple supply control modes, such as an average power tracking (APT) mode and an envelope tracking (ET) mode. The bias control circuit is configured to switch a bias of the power amplifier based on the supply control mode of the power management circuit.
    Type: Grant
    Filed: May 6, 2020
    Date of Patent: March 23, 2021
    Assignee: Skyworks Solutions, Inc.
    Inventors: Netsanet Gebeyehu, Srivatsan Jayaraman, Edward James Anthony
  • Patent number: 10951247
    Abstract: Methods, systems, and devices for channelizing a wideband waveform for transmission on a spectral band comprising unavailable channel segments are described. Generally, the described techniques provide for transmitting and receiving wideband waveforms when channels of a system bandwidth are unavailable for transmission. A transmitter may separate a first wideband signal into segments, with each segment a bandwidth corresponding to a channel of the system bandwidth, and may map the segments to the available channels. The transmitter may combine the mapped segments into a second wideband waveform and transmit the second wideband waveform using the available channels. A receiver may receive a first wideband signal waveform and may separate the first wideband signal waveform into segments, de-map the segments and combine the de-mapped segments into a second wideband waveform for demodulation. The techniques may be used to transmit and receive wideband waveforms over tactical data links.
    Type: Grant
    Filed: October 10, 2019
    Date of Patent: March 16, 2021
    Assignee: VIASAT, INC.
    Inventors: Michael T. Kretsch, David C. Jacobs, David J. Trusheim, Robert T. Short
  • Patent number: 10944361
    Abstract: A system includes a Zero IF transmitter having a mixer and a programmable gain stage. The Zero IF transmitter also includes an intermediate stage between the mixer and the programmable gain stage, wherein the intermediate stage is configured to decouple the mixer and the programmable gain stage.
    Type: Grant
    Filed: February 13, 2019
    Date of Patent: March 9, 2021
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Rahul Sharma, Jagannathan Venkataraman, Eeshan Miglani, Sandeep Kesrimal Oswal
  • Patent number: 10938424
    Abstract: A communication system receives an input signal along a signal processing path and generates a converted output signal via a digital-to-analog converter (DAC). The signal processing path branches into two different branches, a magnitude branch and a sign branch for different components of the baseband signal. A local oscillator (LO) provides a carrier signal to the signal processing path at the DAC and further generates an LO leakage signal comprising a signed LO leakage and an unsigned LO leakage during the up-conversion of signals of the sign branch with a carrier. An unsigned LO suppression component is configured to reduce or eliminate the unsigned LO leakage and a signed LO suppression component is configured to reduce or eliminate the signed LO leakage form a baseband signal of the signal processing path.
    Type: Grant
    Filed: October 11, 2016
    Date of Patent: March 2, 2021
    Assignee: Intel IP Corporation
    Inventors: Christian Mayer, Jovan Markovic
  • Patent number: 10897276
    Abstract: Disclosed are implementations for digital predistortion of signals provided to a radio frequency (RF) transmission path configured to transmit radio signals in a plurality of subbands within a spectral range, including a method that includes configuring a digital predistorter for predistorting signals comprising arbitrary spectral content within the spectral range. The configuring includes acquiring data samples representing operation of the RF transmission path to transmit radio signals in different subbands, each sample including a digital input signal representing spectral content concentrated in a respective subband, and updating parameters of the digital predistorter according to the acquired data samples to mitigate non-linear characteristics of the RF transmission path.
    Type: Grant
    Filed: August 28, 2020
    Date of Patent: January 19, 2021
    Assignee: NanoSemi, Inc.
    Inventors: Alexandre Megretski, Kevin Chuang, Yan Li, Zohaib Mahmood, Helen H. Kim
  • Patent number: 10841018
    Abstract: An apparatus comprising means for: applying beam shape coefficients for obtaining a beam shape output for a linear part of the beam formed by an array of transmitters, each transmitter being associated with a respective transmit path comprising a respective power amplifier; varying the output characteristics of at least one transmit path to increase nonlinear characteristics between the transmit paths to provide a beam shape for a non-linear part of the beam; linearizing the output of the array by: determining linearization coefficients for the array for digitally predistorting the input signal to the array; and applying the linearization coefficients to the signal input to the array; and calibrating the transmitter array by: measuring error distributions over at least two transmit paths; modifying the beam shape coefficients to better obtain the beam shapes subsequent to the linearization; and applying the modified beam shape coefficients to the array of transmitters.
    Type: Grant
    Filed: October 7, 2019
    Date of Patent: November 17, 2020
    Assignee: NOKIA TECHNOLOGIES OY
    Inventors: Nuutti Tervo, Marko Leinonen, Aarno Tapio Pärssinen
  • Patent number: 10826594
    Abstract: A multiple-input multiple-output (MIMO) capable system is contemplated. The communication system may include a signal processor configured to separate an input stream into multiple signal paths to facilitate simultaneous transport through a communication medium. The capability to simultaneously transmit multiples signal paths may be beneficial in order to maximize throughput and/or minimize expense.
    Type: Grant
    Filed: March 20, 2018
    Date of Patent: November 3, 2020
    Assignee: Cable Television Laboratories, Inc.
    Inventors: Luis Alberto Campos, Jennifer Andreoli-Fang, Joey Padden, Ian MacMillan
  • Patent number: 10797736
    Abstract: A radio-frequency power amplification circuit includes: a power amplification sub-circuit and an output matching sub-circuit, wherein the power amplification sub-circuit is used for selecting, according to a received control signal corresponding to a radio-frequency mode, a power amplification parameter corresponding to the radio-frequency mode to amplify a received radio-frequency signal, and outputting the amplified radio-frequency signal; the output matching sub-circuit is connected to the power amplification sub-circuit and is used for receiving the amplified radio-frequency signal, and transmitting, according to the control signal, the amplified radio-frequency signal by using an impedance corresponding to the radio-frequency mode.
    Type: Grant
    Filed: October 29, 2019
    Date of Patent: October 6, 2020
    Assignee: SMARTER MICROELECTRONICS (GUANG ZHOU) CO., LTD.
    Inventors: Baiming Xu, Qiang Su, Yang Li, Jiangtao Yi
  • Patent number: 10784904
    Abstract: Methods, systems, and devices are described for transceiver architecture for millimeter wave wireless communications. A device may include two transceiver chip modules configured to communicate in different frequency ranges. The first transceiver chip module may include a baseband sub-module, a first radio frequency front end (RFFE) component and associated antenna array. The second transceiver chip module may include a second RFFE component and associated antenna array. The second transceiver chip module may be separate from the first transceiver chip module. The second transceiver chip module may be electrically coupled to the baseband sub-module of the first transceiver chip module.
    Type: Grant
    Filed: August 28, 2015
    Date of Patent: September 22, 2020
    Assignee: QUALCOMM Incorporated
    Inventors: Haim Mendel Weissman, Lior Raviv, Xiaoyin He, Vladimir Aparin
  • Patent number: 10763806
    Abstract: An envelope tracking device includes a fine slot peak tracking (FSPT) circuit, at least one power amplifier, and an envelope modulator. The FSPT circuit is connected to the power amplifier through the envelope modulator. The FSPT circuit generates envelope signals based on input signals, adds an offset to the envelope signals, and expands and smoothes the added envelope signals. The envelope modulator generates envelope voltage signals according to the smoothed envelope signals, and outputs the signals to drain of the power amplifier. The envelope voltage signals are time-aligned with the amplified signals which are transmitted to gate of the power amplifier.
    Type: Grant
    Filed: December 7, 2018
    Date of Patent: September 1, 2020
    Assignee: Chiun Mai Communcation Systems, Inc.
    Inventor: Kwo-Jyr Wong
  • Patent number: 10763904
    Abstract: Disclosed are digital predistortion implementations, including a method that includes collecting data for a wireless device with a transmit chain that includes at least one power amplifier that produces output with non-linear distortions, the data including data records that each includes input signal data and corresponding output signal data for the transmit chain, and with each record being associated with a set of operating conditions values, and with a variety measure representative of an extent of distinguishability of the record from other data records. The method further includes selecting at least some of the data records according to a variety criterion computed based on the variety measure for each record, computing, based on the selected records, digital predistortion parameters used to control a digital predistorter of the wireless device, and applying the digital predistorter, configured with the computed digital predistortion parameters, to subsequent input signals.
    Type: Grant
    Filed: May 24, 2019
    Date of Patent: September 1, 2020
    Assignee: NanoSemi, Inc.
    Inventors: Alexandre Megretski, Kevin Chuang, Yan Li, Zohaib Mahmood, Helen H. Kim
  • Patent number: 10764078
    Abstract: A transmitter is configured to generate a DOCSIS signal for transmission onto a frequency-selective coaxial cable. The transmitter comprises a first reverse tilt filter circuit, a digital predistortion circuit, a forward tilt filter, a wideband equalizer, a second reverse tilt filter, and a power amplifier. The responses of the tilt filters may be set based on the frequency response of the frequency-selective coaxial cable to which the transmitter is intended to be coupled. The predistortion circuit may compensate for distortion introduced by circuitry of the transmitter. The equalizer circuit may be operable to compensate for undesired linear response of other circuitry of the transmitter.
    Type: Grant
    Filed: March 18, 2019
    Date of Patent: September 1, 2020
    Assignee: MaxLinear, Inc.
    Inventors: Mario Milicevic, Ioannis Spyropoulos
  • Patent number: 10763795
    Abstract: The present invention, which relates to a multi-path communication device for sharing a feedback path for digital pre-distortion, includes: a DPD processing unit configured to output a plurality of pre-distorted signals by respectively pre-distorting a plurality of input signals, to output an nth control signal when an nth input signal is input, and to output an nth pre-distorted signal using an nth feedback signal input in response to the nth control signal; a power amplifying unit configured to amplify each of the plurality of pre-distorted signals and output a plurality of amplified signals; a signal combining unit configured to combine some of each of the plurality of amplified signals and output combined feedback signal; and a signal selection unit configured to select and output only the nth feedback signal from the combined feedback signal according to the input nth control signal, thereby preventing an increase in the size of a device and manufacturing cost thereof caused by a plurality of DPD feedbac
    Type: Grant
    Filed: December 12, 2019
    Date of Patent: September 1, 2020
    Assignee: SOLiD, INC.
    Inventors: Kwang Nam Seo, Do Yoon Kim, Hyoung Ho Kim
  • Patent number: 10749553
    Abstract: A method of operating a communications system includes receiving a signal at a digital predistorter (DPD), introducing predistortion to the signal using the DPD, and converting the predistorted signal to an analog signal using a digital-to-analog converter having a first bandwidth. The method also includes amplifying the analog signal, sampling the amplified signal using an analog-to-digital converter having a second bandwidth less than the first bandwidth, and extracting coefficients of the DPD from the sampled signal.
    Type: Grant
    Filed: February 19, 2019
    Date of Patent: August 18, 2020
    Assignee: DALI SYSTEMS CO. LTD
    Inventors: Wan-Jong Kim, Shawn Patrick Stapleton
  • Patent number: 10749485
    Abstract: Embodiments of the present disclosure provide a digital predistortion processing apparatus, where the apparatus includes an analog-to-digital conversion unit and n digital predistortion elements. The analog-to-digital conversion unit is connected to the n digital predistortion elements. Each digital predistortion element is configured to receive n input signals, perform digital predistortion processing on the n input signals, and then output n processed signals. The analog-to-digital conversion unit is configured to receive the n processed signals, perform signal extraction based on the n processed signals, and output an extracted signal, where a rate of the extracted signal is the same as a rate of each of the n processed signals. For an ultra-large-bandwidth signal, DPD correction may be performed without increasing a technical level of existing components such as an FPGA and an ADC, thereby greatly reducing implementation costs.
    Type: Grant
    Filed: January 7, 2019
    Date of Patent: August 18, 2020
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Yiwei Hong, Xianglin Li, Yuxiang Xiao
  • Patent number: 10742474
    Abstract: An envelope tracking (ET) amplifier circuit is provided. The voltage mDPD circuit is provided in an ET amplifier circuit and configured to determine a voltage deviation relative to an ET modulated target voltage signal, execute an mDPD polynomial in one or more iterations to extract an mDPD coefficient(s), and adjust a time-variant target voltage envelope of the ET modulated target voltage signal based on the mDPD coefficient(s) extracted in each of the mDPD iterations to reduce the voltage deviation to a predefined threshold. By reducing the voltage deviation in the ET modulated voltage, it is possible improve linearity (e.g., gain linearity) of the ET amplifier circuit, which can lead to reduced power consumption and improved radio frequency (RF) performance.
    Type: Grant
    Filed: April 1, 2019
    Date of Patent: August 11, 2020
    Assignee: Qorvo US, Inc.
    Inventors: Nadim Khlat, Jean-Frederic Chiron, Andrew F. Folkmann
  • Patent number: 10736134
    Abstract: Techniques for a user equipment to perform uplink communication in a wireless communication system. The user equipment performs operations that include: receiving configuration information for a codebook set related with a modulation scheme; receiving a UL grant including a specific codeword index; selecting a codebook based on the specific codeword index included in the codebook set; and transmitting data based on the selected codebook, wherein the codebook set includes a plurality of codebooks predefined for non-orthogonal coded multiple access (NCMA) scheme based communication, and wherein the codebook set is configured based on a spreading factor or an overloading factor.
    Type: Grant
    Filed: April 12, 2017
    Date of Patent: August 4, 2020
    Assignee: LG Electronics Inc.
    Inventors: Hojae Lee, Sangrim Lee, Dongkyu Kim, Kwangseok Noh
  • Patent number: 10700720
    Abstract: A wireless transmitter is disclosed. The wireless transmitter includes a digital signal generator arranged to generate a digital signal for transmission, a digital-to-analog converter arranged to convert the digital signal for transmission into analog form and a non-ideal amplifier arranged to amplify the analog signal for transmission. At least one harmonic reduction signal generator is arranged to generate at least one digital harmonic reduction signal and a summing junction is arranged to add the digital signal for transmission with the at least one harmonic reduction signal to form a combined signal. The non-ideal amplifier amplifies the combined signal to form an analog output signal. A controller is coupled to the digital signal generator and the at least one harmonic reduction signal generator.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: June 30, 2020
    Assignee: NXP B.V.
    Inventor: Siegfried Arnold
  • Patent number: 10700722
    Abstract: An example communication system includes a frequency-segmented power amplifier (PA) circuit that includes a plurality of PA segments. Each PA segment is configured to amplify a portion of a PA input signal in a different frequency band to generate a respective output signal (PA segment output signal). The frequency-segmented PA circuit further includes a combiner, configured to combine PA segment output signals from different PA segments to provide a power-amplified version of the PA input signal. Implementing such a frequency-segmented PA circuit may result in significant improvement in PA efficiency.
    Type: Grant
    Filed: April 30, 2019
    Date of Patent: June 30, 2020
    Assignee: ANALOG DEVICES INTERNATIONAL UNLIMITED COMPANY
    Inventor: Patrick Pratt
  • Patent number: 10680559
    Abstract: An envelope tracking (ET) system is provided. The ET amplifies a radio frequency (RF) signal correspond to an amplitude bandwidth exceeding a voltage modulation bandwidth limitation of the ET system. The ET system compresses the amplitude bandwidth to match the voltage modulation bandwidth of the ET system. More specifically, the ET system compresses a predefined voltage waveform, which tracks time-variant amplitudes of a digital form of the RF signal, to generate a modified voltage waveform at a reduced bandwidth. To ensure that signal distortion(s) resulted from the bandwidth compression can be corrected, the ET system nonlinearly modifies predefined amplitude(s) of the predefined voltage waveform to generate modified amplitude(s) of the modified voltage waveform that is never less than the predefined amplitude(s) of the predefined voltage waveform. As such, the ET system can amplify the RF signal with improved linearity and efficiency, without degrading spectral performance of the RF signal.
    Type: Grant
    Filed: February 5, 2018
    Date of Patent: June 9, 2020
    Assignee: Qorvo US, Inc.
    Inventors: Nadim Khlat, Andrew F. Folkmann
  • Patent number: 10659009
    Abstract: Embodiments of methods and systems for attenuator phase compensation are described. In an embodiment, a method for attenuator phase compensation involves determining a phase compensation value for an attenuator based on an attenuation configuration of the attenuator and performing phase compensation according to the phase compensation value to maintain a constant phase response.
    Type: Grant
    Filed: August 1, 2016
    Date of Patent: May 19, 2020
    Assignee: NXP B.V.
    Inventors: Gernot Hueber, Ian Thomas Macnamara
  • Patent number: 10659091
    Abstract: A digitally-controlled power amplifier (DPA) includes a radio frequency digital-to-analog converter (RF-DAC) constructed from nonlinearly weighted PA segments, a multiphase RF drive signal generator that drives the PA segments, and overdrive voltage control circuitry. The nonlinear weighting of the PA segments intrinsically compensates for amplitude-code-word dependent amplitude distortion (ACW-AM distortion) involved in the operation of the RF-DAC and the multiphase RF drive signal generator facilitates ACW-dependent phase distortion (ACW-PM distortion) reduction, thus obviating the need for complicated and efficiency-degrading digital predistortion. The overdrive voltage control circuitry is used to fine tune the RF output of the DPA and compensate for other non-idealities and external influences such as process, voltage, temperature (PVT), frequency and/or load impedance variations.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: May 19, 2020
    Assignee: Technische Universiteit Delft
    Inventors: Mohsen Hashemi, Leonardus Cornelis Nicolaas de Vreede
  • Patent number: 10637415
    Abstract: A linearity improving system and a linearity improving method are provided. The linearity improving system includes a coupler, a downconverter and a transformer. The coupler is configured to couple a part of an input RF signal. The downconverter coupled to the coupler converts the input RF signal to a fundamental frequency and outputs a modulation signal. The transformer coupled to the downconverter adjusts a phase and a power of the modulation signal. After the input RF signal and the modulation signal being adjusted are inputted to an amplifier, the amplifier outputs an output RF signal.
    Type: Grant
    Filed: December 24, 2018
    Date of Patent: April 28, 2020
    Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Yu-Cheng Liu, Chih-Chun Shen
  • Patent number: 10637712
    Abstract: Included are a first signal exchanger for exchanging a TXI signal and a TXQ signal output from a transmission baseband unit to signal paths and a TX control unit for controlling generation of the TXI signal and the TXQ signal in the transmission baseband unit on the basis of a measurement result of a reception baseband unit before and after exchange of the signals by the first signal exchanger. As a result, a transceiver only needs to have a single local signal generating unit mounted thereon as a local signal generating unit that is an analog circuit.
    Type: Grant
    Filed: December 19, 2016
    Date of Patent: April 28, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hideyuki Nakamizo, Kenichi Tajima
  • Patent number: 10615754
    Abstract: A method is provided. The method, comprises: power amplifying, with at least two parallel power amplifiers, at least two pre-distorted signals each corresponding to a unique transmit band, wherein each power amplifier operates in a unique transmit band; and pre-distorting, with a single pre-distortion system, at least two signals in different transmit bands, where the pre-distortion of each of the at least two signals is based upon a portion of a corresponding power amplified, pre-distorted signal, and where the pre-distortion diminishes certain IMD products in the corresponding power amplified, pre-distorted signal.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: April 7, 2020
    Assignee: CommScope Technologies LLC
    Inventors: Patrick Braun, Joerg Stefanik, Mohammed Dokni, Peter Schmid, Rainer Friedrich
  • Patent number: 10594270
    Abstract: A supply modulator for a polar power amplifier and method for operating the same are disclosed. An apparatus includes an amplifier having an input for receiving a phase modulated (PM) signal. A modulator is arranged to receive an amplitude modulated (AM) signal and provide a supply voltage to the amplifier, the supply voltage varying based on the AM signal. A detector circuit may detect the supply voltage exceeding a first threshold or falling below a second threshold. The detector circuit includes a current source arranged to provide a bias current to the modulator. When the supply voltage exceeds the first threshold, the detector causes an increase in the bias current provided to the modulator. Similarly, when the supply voltage falls below a second threshold, the detector causes an increase of the bias current supplied to the modulator.
    Type: Grant
    Filed: August 7, 2018
    Date of Patent: March 17, 2020
    Assignee: Apple Inc.
    Inventor: Utku Seckin
  • Patent number: 10587315
    Abstract: The present invention relates to a method for multiple-input multiple-output impairment pre-compensation comprising: receiving a multiple-input signal; generating a pre-distorted multiple-input signal from the received multiple-input signal; generating a multiple-output signal by feeding the pre-distorted multiple-input signal into a multiple-input and multiple-output transmitter; estimating impairments generated by the multiple-input and multiple-output transmitter; and adjusting the pre-distorted multiple-input signal to compensate for the estimated impairments. The present invention also relates to a pre-compensator for use with a multiple-input and multiple-output transmitter, comprising: a multiple-input for receiving a multiple-input signal; a matrix of pre-processing cells for generating a pre-distorted multiple-input signal from the received multiple-input signal; and a multiple-output for feeding the pre-distorted multiple-input signal to the multiple-input and multiple-output transmitter.
    Type: Grant
    Filed: April 10, 2017
    Date of Patent: March 10, 2020
    Inventor: Fadhel M Ghannouchi
  • Patent number: 10567148
    Abstract: Techniques are disclosed relating to use of digital predistortion in the context of full-duplex radio. In some embodiments, an apparatus includes one or more antennas and is configured to simultaneously transmit and receive wireless signals via at least partially overlapping frequency resources using the one or more antennas. In some embodiments, the apparatus includes receive chain circuitry that is configured to process both wireless signals transmitted by the apparatus via the one or more antennas and over-the-air wireless signals from one or more other computing devices. In some embodiments, the apparatus includes one or more processing elements configured to determine one or more digital predistortion parameters based on the wireless signals transmitted by the apparatus via the one or more antennas and processed by the receive chain circuitry and apply predistortion to transmitted wireless signals based on the one or more digital predistortion parameters.
    Type: Grant
    Filed: December 29, 2017
    Date of Patent: February 18, 2020
    Assignee: National Instruments Corporation
    Inventors: James Wesley McCoy, Takao Inoue, Jaeweon Kim
  • Patent number: 10568039
    Abstract: An electronic device supporting beamforming and a method of operating the electronic device are provided. The electronic device includes a first amplifier configured to amplify a first signal and a second amplifier for amplifying a second signal, a power control module configured to generate first power control information based at least on a first attribute of the first signal and generate second power control information based at least on the first power control information and a second attribute of the second signal, and at least one power supply module configured to control power supplied to the first amplifier based at least on the first power control information and control power supplied to the second amplifier based at least on the second power control information.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: February 18, 2020
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sungchul Park, Wonjoon Choi
  • Patent number: 10547481
    Abstract: Embodiments of the present disclosure provide a clipping method and an apparatus. The clipping apparatus is a base station, and the base station includes a baseband unit (BBU) and a remote radio unit (RRU). The BBU includes a first processor, and the RRU includes a second processor. The first processor is configured to: perform clipping after combining N input carriers, and output N carriers obtained after a first level of clipping; and the second processor is configured to: perform clipping after combining the N carriers obtained after the first level of clipping, and output N carriers obtained after a second level of clipping, where N is an integer greater than or equal to 2. The base station separately performs clipping at the BBU and the RRU, so that the base station can flexibly select, a baseband processing board or a baseband chip to deploy the first level of clipping.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: January 28, 2020
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Jianzhong Yao
  • Patent number: 10536120
    Abstract: The present invention, which relates to a multi-path communication device for sharing a feedback path for digital pre-distortion, includes: a DPD processing unit configured to output a plurality of pre-distorted signals by respectively pre-distorting a plurality of input signals, to output an nth control signal when an nth input signal is input, and to output an nth pre-distorted signal using an nth feedback signal input in response to the nth control signal; a power amplifying unit configured to amplify each of the plurality of pre-distorted signals and output a plurality of amplified signals; a signal combining unit configured to combine some of each of the plurality of amplified signals and output combined feedback signal; and a signal selection unit configured to select and output only the nth feedback signal from the combined feedback signal according to the input nth control signal, thereby preventing an increase in the size of a device and manufacturing cost thereof caused by a plurality of DPD feedbac
    Type: Grant
    Filed: March 28, 2016
    Date of Patent: January 14, 2020
    Assignee: SOLiD, INC.
    Inventors: Kwang Nam Seo, Do Yoon Kim, Hyoung Ho Kim