Modulator-demodulator-type Amplifier Patents (Class 330/10)
  • Patent number: 10256780
    Abstract: A power conversion system comprising an amplifier input for receiving an analog input signal and an amplifier output for providing a switching output signal is disclosed. The system is applicable for use in high definition switching audio amplification. The power conversion system further comprises a clipper for clipping the analog input signal having a predefined range limited by a clipping level, a pulse modulator and a switching power stage. The system further has a feedback path to the clipper including a duty cycle measuring unit and a clip level filter which generates a clip level signal and where the clipping level of the clipper is controlled by the clip level signal. Hereby it is e.g. possible to clip an analog input signal with good precision and reliability in a switching power conversion system.
    Type: Grant
    Filed: March 8, 2016
    Date of Patent: April 9, 2019
    Assignee: ICEpower a/s
    Inventor: Kennet Skov Anderson
  • Patent number: 10256777
    Abstract: Certain aspects of the present disclosure provide amplifiers. Certain aspects of the present disclosure provide methods and apparatus for protecting an such amplifiers, for example an audio amplifier, or a delta-sigma modulator from saturation. One example amplifier generally includes an output stage comprising a plurality of transistors; and a feedback network having an input coupled to an output of the output stage and comprising a plurality of integrators connected in series. At least one of the plurality of integrators generally includes an operational amplifier having an input and an output, a first resistive element coupled to the input of the operational amplifier, a capacitive element coupled between the input and the output of the operational amplifier; and a first switch coupled between the input and the output of the operational amplifier. For certain aspects, the amplifier may be a class-D amplifier or a direct digital feedback amplifier (DDFA).
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: April 9, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: William Cope, Julian Aschieri, Tomer Saraf
  • Patent number: 10256236
    Abstract: A switch circuit includes a first MOS transistor and a second MOS transistor of a same conductivity type connected in parallel between a first terminal and a second terminal of the switch circuit, the first and second MOS transistors having respective gate terminals coupled to the control terminal to receive a control signal to turn the first and second MOS transistors on or off. The first MOS transistor is characterized by a first reverse gate-to-drain capacitance (Crss) and the second MOS transistor is characterized by a second Crss that is greater than the first Crss.
    Type: Grant
    Filed: August 2, 2018
    Date of Patent: April 9, 2019
    Assignee: ALPHA AND OMEGA SEMICONDUCTOR INCORPORATED
    Inventors: Ji Pan, Sik Lui
  • Patent number: 10250194
    Abstract: An envelope tracking scheme can be used, such as to modulate a supply node of a power amplifier circuit to improve efficiency. For example, a magnitude or amplitude envelope of a signal to be modulated can be scaled and used to drive a node, such as a drain, of the power amplifier circuit. An envelope tracking signal can be generated such as having a bandwidth that is compressed as compared to a full-bandwidth envelope signal. A peak-value “look ahead” technique can be used, for example, so that amplitude compression or clipping of the transmit signal is suppressed when the bandwidth-compressed envelope tracking signal is used to modulate a supply node of the power amplifier used to amplify the transmit signal.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: April 2, 2019
    Assignee: Analog Devices Global
    Inventors: Patrick Pratt, Joseph Bradford Brannon, Ronald Dale Turner
  • Patent number: 10243360
    Abstract: A power supply apparatus may include an electronic control unit. The electronic control unit may be configured to set target timing of switching of each of the switch. The electronic control unit may be configured to set the target timing in one cycle of a first carrier wave in accordance with first timing and in one cycle of a second carrier wave in accordance with second timing. The first timing may be two of timing in the one cycle of the first carrier wave that are defined by a first target duty ratio and the first carrier wave. The second timing may be two of timing in the one cycle of the second carrier wave that are defined by a second target duty ratio and the second carrier wave. The second carrier wave may be in the same cycle as the first carrier wave.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: March 26, 2019
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hidetsugu Hamada, Toshiya Hashimoto
  • Patent number: 10236831
    Abstract: Envelope trackers providing compensation for power amplifier output load variation are provided herein. In certain configurations, a radio frequency (RF) system includes a power amplifier that amplifies an RF signal, an output detector coupled to an output of the power amplifier and that generates an output detection signal, an input detector coupled to an input of the power amplifier and that generates an input detection signal, and an envelope tracker that generates a power amplifier supply voltage for the power amplifier based on an envelope of the RF signal. The envelope tracker compensates the power amplifier for output load variation based on the output detection signal and the input detection signal.
    Type: Grant
    Filed: May 2, 2018
    Date of Patent: March 19, 2019
    Assignee: Skyworks Solutions, Inc.
    Inventors: Sabah Khesbak, Serge Francois Drogi
  • Patent number: 10224883
    Abstract: Various embodiments are directed to apparatuses and methods to generate a first signal representing modulation data and a second signal representing an amplitude of the modulation data, the first signal and the second signal to depend on an output signal and vary a power supply voltage to a gain stage in proportion to the amplitude of the modulation data.
    Type: Grant
    Filed: July 26, 2017
    Date of Patent: March 5, 2019
    Assignee: INTEL CORPORATION
    Inventors: Nicholas P. Cowley, Isaac Ali, William L. Barber
  • Patent number: 10193505
    Abstract: In accordance with embodiments of the present disclosure, a system may have a configurable control loop technology, wherein the system comprises a first mode control loop, a second mode control loop and a reconfigurable pulse width modulator (PWM) configured to generate an output signal from an input signal. The reconfigurable PWM may include a digital PWM and an analog PWM and may be configured such that when the first mode control loop is activated, the reconfigurable PWM utilizes the analog PWM to generate the output signal from the input signal and when the second mode control loop is activated, the reconfigurable PWM utilizes the digital PWM to generate the output signal from the input signal and the digital PWM receives its input from a digital proportional integral derivative controller.
    Type: Grant
    Filed: July 27, 2017
    Date of Patent: January 29, 2019
    Assignee: Cirrus Logic, Inc.
    Inventors: Emmanuel Marchais, Lingli Zhang, Eric J. King, Christian Larsen
  • Patent number: 10186970
    Abstract: An AC capable power amplifier arrangement is realized that includes a buck converter with a power inductor, two buck switches, and alternately a buck-boost converter using four switches, each driving an output polarity steering set of four switches. The polarity steering switches convey the converter output current to output terminals that connect to a load with a capacitor connected in parallel. A differential receiver is connected to the output terminals to provide negative feedback. A mixer receives an input voltage signal, an output of the differential receiver, and output from a triangle wave generator. A set of two comparators for buck amplifier conversion, or four comparators for buck-boost amplifier conversion, each receives an output of the mixer. Each of the comparators produces a respective output for driving the converter switches through simple steering logic interfaces between the comparators, the converter components and a polarity steering output stage.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: January 22, 2019
    Assignee: Panasonic Automotive Systems Company of America, Division of Panasonic Corporation of North America
    Inventors: Richard Dennis Fay, Jerry Alan Rathje
  • Patent number: 10177718
    Abstract: This application relates to audio amplifier circuitry (100). An amplifier module (103) is located in a signal path between an input (101) and an output (102). A detection module (106) is configured to detect a characteristic of a load (104) electrically coupled, in use, to the output. A distortion setting controller (107) is provided for selecting one of a plurality of stored distortion settings {pi} based on the detected characteristic of the load; and a pre-distortion module (105) is configured to apply a first transfer function to a signal in the signal path prior to said amplifier module. The first transfer function is based on the selected distortion setting and for at least one of the stored distortion settings the corresponding first transfer function comprises a non-linear distortion function.
    Type: Grant
    Filed: December 29, 2017
    Date of Patent: January 8, 2019
    Assignee: Cirrus Logic, Inc.
    Inventors: John Paul Lesso, Emmanuel Philippe Christian Hardy
  • Patent number: 10171049
    Abstract: Methods and apparatus for Class-D amplifier circuits with improved power efficiency. The circuit has an output stage with at least first and second switches and a modulator that receives an input signal to be amplified, SIN, and a first clock signal fSW. The modulator controls the duty cycles of the first and second switches, within a switching cycle based on the input signal, wherein the switching cycle has a switching frequency based on the first clock signal. A frequency controller controls the frequency of the first clock signal in response to an indication of the amplitude of the input signal so as to provide a first switching frequency at a first input signal amplitude and a second, lower, switching frequency at a second, lower, input signal amplitude. A lower switching frequency can be tolerated at low signal amplitudes and varying the switching frequency in this way thus maintains stability whilst reducing switching power losses.
    Type: Grant
    Filed: October 6, 2017
    Date of Patent: January 1, 2019
    Assignee: Cirrus Logic, Inc.
    Inventors: John P. Lesso, Toru Ido
  • Patent number: 10164577
    Abstract: Circuits and methods for achieving high linearity, high efficiency power amplifiers, including digital predistortion (DPD) and pulse cancellation in switched-state RF power amplifier systems are described.
    Type: Grant
    Filed: August 27, 2015
    Date of Patent: December 25, 2018
    Assignee: ETA DEVICES, INC.
    Inventors: Mark A. Briffa, Joel L. Dawson, John E. DeRoo, Krenar Komoni, David J. Perreault, Oguzhan Uyar
  • Patent number: 10164590
    Abstract: An improved Class-D amplifier may include a digital PWM modulator that receives a digital audio signal and that provides a PWM signal as an input to an analog PWM modulator of the Class-D amplifier. A digital PWM modulator may be configured to receive a digital signal and to generate a first PWM signal based on the digital signal. A digital PWM driver may be coupled to the digital PWM modulator. The digital PWM driver may be configured to receive the first PWM signal and to generate a reference PWM signal based on the first PWM signal. An analog PWM modulator may be coupled to the digital PWM driver. The analog PWM modulator may be configured to receive the reference PWM signal and to generate an output PWM signal based on the reference PWM signal.
    Type: Grant
    Filed: March 2, 2018
    Date of Patent: December 25, 2018
    Assignee: Cirrus Logic, Inc.
    Inventors: Lingli Zhang, Yongjie Cheng, Lei Zhu, Christian Larsen, John L. Melanson
  • Patent number: 10158331
    Abstract: A power amplifying apparatus includes a control circuit generating a bias voltage and generating a control signal using a battery voltage and a reference voltage, and a power amplifying circuit boosting the battery voltage according to the control signal to provide an operating voltage, and operating according to the bias voltage and the operating voltage to amplify an input signal, wherein the power amplifying circuit detects the operating voltage and provides a detection voltage to the control circuit, and the control circuit controls the control signal according to the detection voltage.
    Type: Grant
    Filed: October 26, 2017
    Date of Patent: December 18, 2018
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Byeong Hak Jo, Jeong Hoon Kim, Hyun Paek, Jong Ok Ha
  • Patent number: 10148235
    Abstract: The invention relates to a compensator device for compensating signal dependent delay variations, including dead time and reverse recovery time, causing un-linearity in a Class-D amplifier where the compensator device comprises: a first input terminal for receiving an input pulse width modulated input PWM signal comprising pulses with falling flanks corresponding to a falling level transition and rising flanks corresponding to a rising level transition; and a second input terminal configured to receive the signal provided at an output switching node of a Class-D amplifier; an output terminal for providing a compensated output signal; and controllable delay means configured to receive and delay the pulse modulated input signal, thereby providing a delayed version of the input signal to said output terminal of the compensator device.
    Type: Grant
    Filed: June 1, 2016
    Date of Patent: December 4, 2018
    Assignee: ICEPOWER A/S
    Inventors: Kennet Skov Andersen, Eskil Jørgensen
  • Patent number: 10136238
    Abstract: An audio system and method using indoor response estimation are disclosed. An acoustic feature prediction method of the audio system may include generating a detection signal based on an input signal and a modulation code; generating an acoustic signal based on the detection signal and outputting the acoustic signal to a plurality of speakers; measuring acoustic signals output from the speakers where the speakers are installed; and predicting acoustic features related to the speakers based on the measured acoustic signals and the modulation code.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: November 20, 2018
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jeong Il Seo, Tae Jin Park, Jae Hyoun Yoo, Yong Ju Lee, Jung Woo Choi
  • Patent number: 10122324
    Abstract: A multi-phase amplifier circuit includes an amplification circuit configured to generate a plurality of phase signals and to provide the plurality of phase signals to a plurality of inductors. An inductive coupling between a first pair of inductors differs from an inductive coupling between a second pair of inductors by a first coupling difference. The amplification circuit is configured to provide two phase signals comprising a first phase difference of less than 180° to the first pair of inductors and two further phase signals comprising the first phase difference to the second pair of inductors. An inductive coupling between a third pair of inductors differs from an inductive coupling between a fourth pair of inductors by a second coupling difference. The amplification circuit is configured to provide two phase signals comprising a second phase difference of 180° to the third pair of inductors and two further phase signals comprising the second phase difference to the fourth pair of inductors.
    Type: Grant
    Filed: November 17, 2016
    Date of Patent: November 6, 2018
    Assignee: Intel IP Corporation
    Inventors: Christian Kranz, Stephan Henzler
  • Patent number: 10117035
    Abstract: An electronic system, in some embodiments, comprises: a power source; a load coupled to the power source; an analog-to-digital converter, coupled to the power source and the load, that samples a fluctuating voltage supplied by the power source and generates a digital representation of said fluctuating voltage; control logic, coupled to the analog-to-digital converter, that generates an amplitude correction signal based on said digital representation of the fluctuating voltage and on a target voltage; correction logic, coupled to the control logic, that uses the amplitude correction signal and an audio signal to generate a switch control signal; and an output driver, coupled to the correction logic, that controls coupling between the power source and the load based on the switch control signal.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: October 30, 2018
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Ivo Leonardus Coenen, Alexander Heubi
  • Patent number: 10116215
    Abstract: A switching power stage for producing an output voltage to a load may include a power converter and a controller. The power converter may include a power inductor and plurality of switches arranged to sequentially operate in a plurality of switch configurations. The controller may be configured to, based on a measured parameter associated with the switching power stage, select a selected operational mode of the power converter from a plurality of operational modes, and sequentially apply switch configurations from the plurality of switch configurations to selectively activate or deactivate each of the plurality of switches in order to transfer electrical energy from an input source of the power converter to the load in accordance with the selected operational mode.
    Type: Grant
    Filed: February 3, 2015
    Date of Patent: October 30, 2018
    Assignee: Cirrus Logic, Inc.
    Inventors: Eric Swanson, John L. Melanson, John C. Tucker, Eric J. King
  • Patent number: 10110181
    Abstract: A fixed frequency class-D audio amplifier includes the L-C output filter in a high order feedback loop. An audio amplifier integrated circuit includes an output driver, an output terminal, a first input terminal, a second order filter, and a summing amplifier. The output driver is configured to drive a speaker coil through an L-C filter. The output terminal is to couple the output driver to an input side of the L-C filter. The first input terminal is to couple an output side of the L-C filter to the integrated circuit. The second order filter includes a first filter stage, and a second filter stage coupled to an output of the first filter stage. The summing amplifier includes a first input coupled to the first input terminal, and a second input coupled to an output of the second filter stage.
    Type: Grant
    Filed: February 2, 2017
    Date of Patent: October 23, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Søren Bang Poulsen, Kim Nordtorp Madsen
  • Patent number: 10103140
    Abstract: A switch circuit includes a first MOS transistor and a second MOS transistor of a same conductivity type connected in parallel between a first terminal and a second terminal of the switch circuit, the first and second MOS transistors having respective gate terminals coupled to the control terminal to receive a control signal to turn the first and second MOS transistors on or off. The first MOS transistor is characterized by a first reverse gate-to-drain capacitance (Crss) and the second MOS transistor is characterized by a second Crss that is greater than the first Crss.
    Type: Grant
    Filed: October 14, 2016
    Date of Patent: October 16, 2018
    Assignee: ALPHA AND OMEGA SEMICONDUCTOR INCORPORATED
    Inventors: Ji Pan, Sik Lui
  • Patent number: 10097137
    Abstract: In one embodiment a transmitter is disclosed.
    Type: Grant
    Filed: August 29, 2014
    Date of Patent: October 9, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Gavin Watkins, Konstantinos Mimis
  • Patent number: 10088592
    Abstract: Inductive clamps for use in utility locate operations for inductively coupling current signals from a transmitter to a hidden or buried conductor are disclosed.
    Type: Grant
    Filed: April 11, 2017
    Date of Patent: October 2, 2018
    Assignee: SEESCAN, INC.
    Inventors: Mark S. Olsson, Hunter Brown, Stephanie M. Bench, Justin W. Taylor, Jan Soukup
  • Patent number: 10084414
    Abstract: Circuits and methods for switched mode operational amplifiers are provided. In some embodiments, circuits are provided, the circuits comprising: an amplifier having an output; a first pulse width modulator (PWM) having an input coupled to the output of the amplifier and using a first periodic reference signal waveform; and a second PWM having an input coupled to the output of the amplifier and using a second periodic reference signal waveform, wherein the second periodic reference signal waveform is 180 degrees out of phase from the first periodic reference signal waveform. In some embodiments, circuits are provided, the circuits comprising: an amplifier having an output; and a plurality of pulse width modulators (PWMs) each having an input coupled to the output of the amplifier and using a corresponding unique one of a plurality of periodic reference signal waveforms, wherein the plurality of periodic reference signal waveforms are shifted in phase.
    Type: Grant
    Filed: September 15, 2014
    Date of Patent: September 25, 2018
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Baradwaj Vigraham, Jayanth Kuppambatti, Peter R. Kinget
  • Patent number: 10080192
    Abstract: Apparatus and methods for envelope tracking systems are disclosed herein. In certain implementations, an envelope tracking system for generating a power amplifier supply voltage for a power amplifier is provided. The envelope tracking system includes a DC-to-DC converter that generates a regulated voltage from a battery voltage and controls a voltage of the regulated voltage using a low frequency feedback signal. The envelope tracking system further includes an error amplifier that generates an output current using an envelope signal and a high frequency feedback signal. The low frequency feedback signal is based on a low frequency component of the power amplifier supply voltage and the high frequency feedback signal is based on a high frequency component of the power amplifier supply voltage. The error amplifier generates the power amplifier supply voltage by adjusting the magnitude of the regulated voltage using the output current.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: September 18, 2018
    Assignee: Skyworks Solutions, Inc.
    Inventors: Florinel G. Balteanu, David Steven Ripley, Sabah Khesbak, Jeffrey Gordon Strahler, Roman Zbigniew Arkiszewski, Yevgeniy A. Tkachenko
  • Patent number: 10075136
    Abstract: The present invention discloses a power amplifier capable of adaptively operating in one of an energy efficient mode and a high output power mode. An embodiment of the power amplifier includes a first transistor, a second transistor, a first bias element, a second bias element, a third bias element and a plurality of switches. In the energy efficient mode, by the control over the on/off states of the switches, an inverter type power amplifier is realized with the first transistor, the second transistor, the second bias element and the third bias element. In the high output power mode, by the control over the on/off states of the switches, a common source amplifier or a common emitter amplifier is realized with the second transistor and the first bias element.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: September 11, 2018
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventors: Chien-I Chou, Ka-Un Chan
  • Patent number: 10070218
    Abstract: The present invention discloses a class D amplifier chip with duty ratio limiting functions and the device thereof, a class D amplifier chip includes triangle wave modules, PWM modulation modules, duty ratio detection modules and logic control modules, the input differential audio signals and triangle wave signals generated by the triangle wave module are converted into low voltage pulsed PWM signals through the PWM modulation module, then gets driving processed and generates high voltage pulses; the duty ratio detection module real-time detects the duty ratio of PWM signals, when the logic control module decides the duty ratio of the PWM signals is larger than the preset maximum value, the PWM module is controlled to stop working, equals to close the audio output of the class D amplifier device; which limits the amplitude of the output audio signals, avoids burning the speaker due to an overlarge amplitude.
    Type: Grant
    Filed: September 22, 2014
    Date of Patent: September 4, 2018
    Assignee: SHENZHEN SKYWORTH-RGB ELECTRONIC CO., LTD.
    Inventors: Shijun Zuo, Zhichang Yang, Bingjie Wu
  • Patent number: 10069467
    Abstract: An apparatus for quantized linear amplification with nonlinear amplifiers that performs a linear amplification of variable-envelope single carrier (SC) or multi-carrier (MC) bandpass signals, based on sampled and quantized versions of its complex envelope, where the quantizer generates Nb bits that are mapped into Nm?Nb polar components, in which the quantized symbol can be decomposed, that are modulated as Nm constant or quasi constant envelope signals and where each one is amplified by a nonlinear amplifier.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: September 4, 2018
    Inventors: Paulo Carvalho, Marko Beko, Rui Dinis, Joao Guerreiro, Pedro Viegas
  • Patent number: 10050646
    Abstract: The present invention describes an amplifier adjusting device for an amplifier element which is adjustable as a function of amplification factor and is coupled to a frequency domain selecting element for adjusting at least to frequency domains. The amplifier adjusting device includes a memory in which at least two amplification factors may be stored, the at least two amplification factors being assigned to the two at least two frequency domains, an amplification factor adjusting element configured to select, depending on a current frequency domain, a corresponding amplification factor from the memory in order to adjust the adjustable amplifier element, and an amplification factor estimator configured to correct, based on an analysis of a signal amplified by means of the adjustable amplifier element in accordance with the selected amplification factor, the selected amplification factor and store the corrected amplification factor in the memory.
    Type: Grant
    Filed: June 8, 2017
    Date of Patent: August 14, 2018
    Assignee: Innovationszentrum fuer Telekommunikationstechnik GmbH IZT
    Inventor: Rainer Perthold
  • Patent number: 10044326
    Abstract: A method (300) of generating a pulse width modulation (PWM) signal for an analog amplifier, the amplifier arranged to receive an amplifier input signal having a magnitude, is disclosed. The method comprises receiving (302) a modulator input signal, which is associated with the amplifier input signal; and using (304) the modulator input signal to modulate a carrier to produce the PWM signal, wherein the carrier's frequency varies in dependence on the magnitude of the amplifier input signal. A related pulse width modulator is also disclosed.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: August 7, 2018
    Assignee: Nanyang Technological University
    Inventors: Joseph Sylvester Chang, Tong Ge, Linfei Guo
  • Patent number: 10044383
    Abstract: A technique that reduces or eliminates trading-off power amplifier efficiency and costly external filtering in amplitude and phase modulated sinusoidal signal generation uses multi-phase outphasing and a multi-phase switching mode power amplifier to generate the amplitude and phase modulated sinusoidal signals. The technique combines multiple clock phases with sinusoidally weighted circuits of the switching mode power amplifier to improve amplitude and phase modulated sinusoidal signal generation.
    Type: Grant
    Filed: December 30, 2016
    Date of Patent: August 7, 2018
    Assignee: Silicon Laboratories Inc.
    Inventors: Aaron J. Caffee, Brian G. Drost, Alessandro Piovaccari, Aslamali A. Rafi
  • Patent number: 10038411
    Abstract: A Class D amplifier is described herein that includes an outer loop, an inner loop, and a notch filter. The notch filter can be located between an output of the outer loop and an input of the inner loop. Alternatively or in addition, the notch filter can be located within the outer loop of the Class D amplifier. Ripple content can initially be present at an input to the inner loop of the Class D amplifier, causing nonlinearity in the inner loop and distortion in the audio output signal. The notch filter can filter the ripple content at the input to the inner loop, thereby reducing the nonlinearity present in the inner loop and the distortion in the audio output signal.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: July 31, 2018
    Assignee: RGB Systems, Inc.
    Inventor: Eric Mendenhall
  • Patent number: 10033420
    Abstract: Provided is a wireless communication receiver including an antenna for receiving an RF signal; a first mixer, coupled to the antenna, for performing frequency conversion on the RF signal from the antenna by mixing the RF signal with a local oscillator signal to provide a first intermediate frequency (IF) signal; and a first filter, coupled to the first mixer, configured to pass a predetermined band of frequencies of the first IF signal and to generate a first channel signal. The first filter includes a negative feedback loop coupled to the first mixer for performing negative feedback loop control on the first IF signal; and a positive capacitive feedback loop coupled to the first mixer for performing positive capacitive feedback loop control on the first IF signal, the negative feedback loop and the positive capacitive feedback loop being coupled in parallel.
    Type: Grant
    Filed: March 27, 2017
    Date of Patent: July 24, 2018
    Assignee: MEDIATEK INC.
    Inventors: Yuan-Ching Lien, Eric Klumperink, Bram Nauta
  • Patent number: 10033552
    Abstract: Embodiments of the invention are generally directed driving data of multiple protocols through a single set of pins. An embodiment of an apparatus includes a transmitter connected to two pads on an IC the transmitter including a differential driver to transmit a differential signal, wherein the differential driver has a first branch and a second branch, each branch of the differential driver including a protection device connected to one of the pads; and a common mode driver to transmit a common mode signal, the common mode driver having a first branch and a second branch, each of the branches of the common mode driver including a protection device connected to one of the pads. The first and second switch devices are not turned on simultaneously, based on data to be transmitted, one of the switch devices being turned on and the other being turned off.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: July 24, 2018
    Assignee: Lattice Semiconductor Corporation
    Inventors: Vinayak Agrawal, Namrta Sharma, Nagaraj Chekka, Srikanth Gondi
  • Patent number: 10027294
    Abstract: A class-D amplifier includes a loop filter, a pulse-width modulation (PWM) circuit, an output circuit, and a common-mode control circuit. The loop filter receives an input signal of the class-D amplifier to generate a filtered signal. The PWM circuit converts a non-PWM signal into a PWM signal, wherein the non-PWM signal is derived from at least the filtered signal. The output circuit generates an output signal of the class-D amplifier according to the PWM signal. The common-mode control circuit monitors a common-mode level of the output signal to generate a common-mode control signal for PWM common-mode control.
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: July 17, 2018
    Assignee: MEDIATEK INC.
    Inventors: Wen-Chieh Wang, Yu-Hsin Lin
  • Patent number: 10020778
    Abstract: An amplifier may include a first stage configured to receive an input signal at an amplifier input and generate an intermediate signal which is a function of the input signal, and a final output stage configured to generate an output signal which is a function of the intermediate signal at an amplifier output, and a signal feedback network coupled between the amplifier output and input. The final output stage may be switchable among a plurality of modes including at least a first mode in which the final output stage generates the output signal as a modulated output signal which is a function of the intermediate signal, and a second mode in which the final output stage generates the output signal as an unmodulated output signal which is a function of the intermediate signal. Control circuitry may reduce audio artifacts associated with switching between modes.
    Type: Grant
    Filed: July 17, 2017
    Date of Patent: July 10, 2018
    Assignee: Cirrus Logic, Inc.
    Inventors: Ku He, Tejasvi Das, John L. Melanson
  • Patent number: 10009125
    Abstract: [Problem] To provide a monitoring system capable of monitoring, without stopping operations for a long period of time, a change of the characteristics of an apparatus to be subjected to characteristic measurement, to which high frequency signals are inputted. [Solution] A signal to be monitored and a reference signal are inputted to an input unit 11, and the input unit inputs one of the inputted signals to an apparatus 15 to be subjected to characteristic measurement. On the basis of an output signal of the apparatus 15 and the reference signal in the cases where the reference signal is inputted to the apparatus, an input/output characteristic calculation unit 12 calculates the input/output characteristics of the apparatus 15.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: June 26, 2018
    Assignee: NEC CORPORATION
    Inventor: Kazunori Ishikawa
  • Patent number: 9997925
    Abstract: A power supplying method is adapted to supply power to any one of external electronic devices with voltage-stabilized capacitors of different specifications. The power supplying method includes: generating a periodic signal; periodically turning on and off a load-switch circuit by the periodic signal to enable the load-switch circuit to periodically charge and discharge the voltage-stabilized capacitor; generating an enable signal following the periodic signal; continuously turning on the load-switch circuit by the enable signal to enable the load-switch circuit to supply the power to the external electronic device according to a flag signal; and detecting the amount of a current supplied to the external electronic device by the load-switch circuit to determine a level of the flag signal. During periodically charging and discharging the voltage-stabilized capacitor, the amount of the current supplied to the external electronic device is gradually decreased.
    Type: Grant
    Filed: July 14, 2016
    Date of Patent: June 12, 2018
    Assignee: GETAC TECHNOLOGY CORPORATION
    Inventor: Huang-Wen Su
  • Patent number: 9998241
    Abstract: Apparatus and methods are provided to calibrate a closed-loop envelop tracking system for a power amplifier of a wireless transmitter using standardized modulation signals. In one novel aspect, a closed-loop adaptive method is used to track changes in PA nonlinearity due to environmental or circuitry changes during operating condition using standardized modulation signals. In one embodiment, the PA supply voltage compensation lookup table (LUT) and/or the phase compensation LUT is updated during normal operation to sustain good linearity and efficiency performance. In another novel aspect, the PA target response is adjusted in response to changes in PA-related system configuration, such as changes in PA bias settings, and/or indicators measured from the transmitter such as changes in impedance or temperature changes for the RF module or the PA module. The PA supply voltage compensation LUT and/or the phase LUT is updated accordingly upon adjustment of the PA target response.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: June 12, 2018
    Assignee: MEDIATEK INC.
    Inventors: Chiou-Wei Tsai, Chia-Sheng Peng, Sheng-Hong Yan
  • Patent number: 9991852
    Abstract: A close-down pop reduction system and a method for close-down pop reduction in an audio amplifier assembly are disclosed. The switching power conversion system comprises a forward path having a compensator and a switching power stage and a signal path from an output of a comparator in the switching power stage to a sequence control unit. The signal path includes a close-down timing circuit configured to provide a timing signal. The sequence control unit is configured to eliminate the input signal, increase the switch frequency of the close-down pop reduction system and disable the switching power stage at a moment in time within a PWM pulse of the switching power stage. Hereby, it is e.g. possible to minimize the audible pop during close-down of audio amplifier assemblies.
    Type: Grant
    Filed: November 2, 2015
    Date of Patent: June 5, 2018
    Assignee: ICEpower a/s
    Inventor: Kennet Skov Andersen
  • Patent number: 9973151
    Abstract: A method can be used to measure a load driven by a switching amplifier having a differential input, an LC output demodulator filter and a feedback network between the amplifier output and the differential input. The amplifier is AC driven in a differential and in a common mode by applying a common. The feedback network provides feedback towards the differential input from downstream the LC demodulator filter by computing the impedance of the load as a function of the differential mode output current and the common mode output current. The feedback network provides feedback towards the differential input from upstream the LC demodulator filter by measuring the impedance value of the inductor of the LC demodulator filter, and computing the impedance of the load as a function of the differential mode output current, the common mode output current and the impedance value of the inductor of the LC demodulator filter.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: May 15, 2018
    Assignee: STMicroelectronics S.r.l.
    Inventor: Giovanni Gonano
  • Patent number: 9955254
    Abstract: In accordance with embodiments of the present disclosure, a method may include receiving a digital input signal at a first integrated circuit from a second integrated circuit, receiving a supply voltage at the first integrated circuit from the second integrated circuit, generating an analog output signal from the digital input signal, predicting a distortion of the analog output signal based on the digital input signal and the supply voltage, and controlling a gain applied to at least one of the digital input signal and the analog output signal based on the predicting.
    Type: Grant
    Filed: November 25, 2015
    Date of Patent: April 24, 2018
    Assignee: Cirrus Logic, Inc.
    Inventors: Tejasvi Das, John L. Melanson
  • Patent number: 9941799
    Abstract: A cascade power system includes a non-isolated buck converter in cascade with an isolated Class-E resonant circuit, where the Class-E resonant circuit operates at high frequency, for example 4 Mhz. Further, the non-isolated buck converter is configured as a current source coupled to the Class-E resonant circuit which provides a buck converter output voltage as input to the Class-E resonant circuit. The Class-E resonant circuit includes capacitive isolation for the cascade power system output.
    Type: Grant
    Filed: August 7, 2015
    Date of Patent: April 10, 2018
    Assignee: Flextronics AP, LLC
    Inventors: Mark Telefus, Peter Ramos Yeo, Aldimarl Mantilla Navarro, Bahman Sharifipour
  • Patent number: 9935570
    Abstract: Electronic device (1), capable of operating a DC motor, including an H bridge with an upper left-hand switch (R1), an upper right-hand switch (R2), a lower left-hand switch (R3) and a lower right-hand switch (R4), the second terminal (R1b) of the upper left-hand switch being connected to the second terminal (R3b) of the lower left-hand switch, and the second terminal (R2b) of the upper right-hand switch being connected to the second terminal of the lower right-hand switch, wherein the device is modified by cutting the link between the second terminal of the upper left-hand switch and the second terminal of the lower left-hand switch, and by cutting the link between the second terminal of the upper right-hand switch and the second terminal of the lower right-hand switch.
    Type: Grant
    Filed: November 24, 2014
    Date of Patent: April 3, 2018
    Assignees: CONTINENTAL AUTOMOTIVE FRANCE, CONTINENTAL AUTOMOTIVE GMBH
    Inventors: Jacques Rocher, Philippe Avian
  • Patent number: 9936282
    Abstract: The behavior of a NOS DAC and an analog filter may be emulated by electronic components of an integrated circuit (IC) by upsampling data and applying a digital filter to the upsampled data. For example, the IC may include a zero-order-hold circuit that upsamples data from a first input sample rate to a second, higher input rate. The upsampled data may be passed to an Asynchronous Sample Rate Converter (ASRC) that performs further upsampling (e.g., from 8*Fs-64*Fs). The upsampled data may be passed to a digital low pass filter. The digital low pass filter may emulate, for example, a response of a fifth order Butterworth analog filter to mimic the effect of analog processing. The IC may integrate the upsampling circuit, the low pass digital filter, a digital-to-analog converter (DAC) and an amplifier to provide an audio solution for playing high-fidelity music in a mobile device.
    Type: Grant
    Filed: April 14, 2016
    Date of Patent: April 3, 2018
    Assignee: Cirrus Logic, Inc.
    Inventors: Dylan Alexander Hester, Bala Vishnu Shankar Rao
  • Patent number: 9930446
    Abstract: The disclosure generally relates to acoustic transducers with stationary and moving coils, and methods for operating the acoustic transducers. Time varying signals are applied to the moving and stationary coils to control the movement of a diaphragm, which produces sound. The time varying signals are derived from a composite signal that is provided, via a pair of conductors, to the acoustic transducer. The time varying signals are derived based on various filter methods.
    Type: Grant
    Filed: January 9, 2015
    Date of Patent: March 27, 2018
    Assignee: Harman Becker Gepkocsirendszer Gyarto Korlatoll Felelossegu Tarsasag
    Inventors: John B. French, David Russell
  • Patent number: 9929696
    Abstract: A parallel amplifier and an offset capacitance voltage control loop are disclosed. The parallel amplifier has a parallel amplifier output, which is coupled to an envelope tracking power supply output via an offset capacitive element. The offset capacitive element has an offset capacitive voltage. The offset capacitance voltage control loop regulates the offset capacitive voltage, which is adjustable on a communications slot-to-communications slot basis.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: March 27, 2018
    Assignee: Qorvo US, Inc.
    Inventors: Nadim Khlat, Michael R. Kay, Manbir Singh Nag
  • Patent number: 9929703
    Abstract: An amplifier may include a first stage configured to receive an input signal at an amplifier input and generate an intermediate signal which is a function of the input signal, and a final output stage configured to generate an output signal which is a function of the intermediate signal at an amplifier output, and a signal feedback network coupled between the amplifier output and input. The final output stage may be switchable among a plurality of modes including at least a first mode in which the final output stage generates the output signal as a modulated output signal which is a function of the intermediate signal, and a second mode in which the final output stage generates the output signal as an unmodulated output signal which is a function of the intermediate signal. Structure of the feedback network and the first stage may remain static when switching between modes.
    Type: Grant
    Filed: September 27, 2016
    Date of Patent: March 27, 2018
    Assignee: Cirrus Logic, Inc.
    Inventors: Xin Zhao, Tejasvi Das, Xiaofan Fei, Alan Mark Morton
  • Patent number: 9929706
    Abstract: A switching amplifier includes a first half-bridge PWM modulator, a second half-bridge PWM modulator, and at least one amplifier stage configured to receive input signals. The switching amplifier also includes a PWM control stage configured to control switching of the first PWM modulator and of the second PWM modulator as a function of the input signals, by respective first PWM control signals and second PWM control signals. The amplifier stage and the PWM control stage have a fully differential structure.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: March 27, 2018
    Assignee: STMicroelectronics S.r.l.
    Inventors: Marco Raimondi, Edoardo Botti
  • Patent number: 9917557
    Abstract: A method for offset calibration may include decoupling a modulator input of a first path from a first stage output, coupling a second path output to the modulator input, applying a common-mode voltage to a second path input, receiving a calibration signal from the modulator output generated in response to the common-mode voltage, and modifying one or more parameters of the modulator to compensate for an offset between the first path and the second path indicated by the calibration signal.
    Type: Grant
    Filed: April 17, 2017
    Date of Patent: March 13, 2018
    Assignee: Cirrus Logic, Inc.
    Inventors: Lei Zhu, Xin Zhao, Tejasvi Das, Alan Mark Morton, Xiaofan Fei