Including Class D Amplifier Patents (Class 330/251)
  • Patent number: 10256779
    Abstract: An amplifier includes a first transistor coupled to a first voltage source node and a second transistor coupled to a second voltage source node. The first and second transistors also couple together at an intermediate node. The amplifier further includes a third transistor coupled to the intermediate node and a fourth transistor coupled to the third transistor at a positive output node of the amplifier. Further, the amplifier includes a fifth transistor coupled to the intermediate node and a sixth transistor coupled to the fifth transistor at a negative output node of the amplifier.
    Type: Grant
    Filed: October 11, 2017
    Date of Patent: April 9, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Sudhir Polarouthu, Jasjot Singh Chadha, Rejin Raveendranath Kanjavalappil
  • Patent number: 10243533
    Abstract: Aspects are directed to an amplifier circuit including a signal processing circuit and a calibration circuit. In certain specific embodiments, the signal processing circuit includes a signal combiner and a closed-loop feedback path, and the signal processing circuit is designed to provide a loop transfer function for a derived signal partly representing contributions from an audio input signal, a control or pilot signal having a target frequency range, and a calibration signal. The signal combiner is designed to combine aspects of the control or pilot signal and aspects of the audio input signal, and the calibration circuit is designed to adjust an effective gain of the derived signal in response to whether a unity-gain frequency of a signal in the closed-loop feedback path, as provided via the loop transfer function, is higher or lower than the target frequency range.
    Type: Grant
    Filed: February 8, 2018
    Date of Patent: March 26, 2019
    Assignee: NXP B.V.
    Inventors: Marco Berkhout, Fred Mostert, Massimo Ciacci, Mattheus Johan Koerts, Martin Kessel
  • Patent number: 10236846
    Abstract: A power amplifier using an equivalent transformer is provided. The power amplifier includes amplifiers and T lines having first terminals connected to the amplifiers and second terminals connected to output sides. Accordingly, powers are combined using the equivalent transformer in the power amplifier, such that an insertion loss can be reduced and thus degradation of output power efficiency can be prevented.
    Type: Grant
    Filed: February 12, 2018
    Date of Patent: March 19, 2019
    Assignee: KOREA ELECTRONICS TECHNOLOGY INSTITUTE
    Inventors: Ki Jin Kim, Kwang Ho Ahan
  • Patent number: 10224877
    Abstract: Resistor mismatch may be digitally compensated based on a known resistor mismatch, power supply information, and/or other operating parameters of the amplifier. The digital compensation may be applied to the digital input signal before conversion for processing and amplification in the analog domain. An amplifier with digital compensation for resistor mismatch may be used in a class-D amplifier with a closed loop and feedforward feedback. A class-D or other amplifier with digital compensation may be integrated with electronic devices such as mobile phones.
    Type: Grant
    Filed: April 28, 2017
    Date of Patent: March 5, 2019
    Assignee: Cirrus Logic, Inc.
    Inventors: Lei Zhu, Xin Zhao, John L. Melanson
  • Patent number: 10206037
    Abstract: A class-D amplifier includes measurement of speaker current via the low-side drive transistors of the amplifier. In one embodiment, a class-D amplifier includes two high-side transistors, two low-side transistors, a first sense resistor, a second sense resistor, and a sigma delta analog to digital converter (?? ADC). The two high-side transistors and two low-side transistors are connected as a bridge to drive a bridge tied speaker. The first sense resistor is connected between a first of the low-side transistors and a low-side reference voltage. The second sense resistor is connected between a second of the low-side transistors and the low-side reference voltage. The ?? ADC is coupled to the bridge to measure voltage across the first sense resistor and the second sense resistor.
    Type: Grant
    Filed: December 30, 2016
    Date of Patent: February 12, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Mohit Chawla
  • Patent number: 10193459
    Abstract: The present invention relates to a bi-directional DC-DC converter comprising: a first terminal, a second terminal, a transformer circuit, a first high voltage side coupled to said first terminal, and a second low voltage side coupled to said second terminal; wherein said first high voltage side and said second low voltage side are coupled to each other by means of said transformer circuit, and said first high voltage side comprises a resonant tank circuit coupled between a first bridge circuit of said first high voltage side and a high voltage side of said transformer circuit. Furthermore, the invention also relates to a system comprising at least two such bi-directional DC-DC converters.
    Type: Grant
    Filed: December 1, 2017
    Date of Patent: January 29, 2019
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Grover Victor Torrico-Bascopé, Fernando Ruiz Gomez, Cicero Da Silveira Postiglione
  • Patent number: 10164588
    Abstract: An audio amplifier circuit for driving an electro-acoustic transducer, which is bridged transless (BTL)-connected to the audio amplifier circuit, in a filterless manner, including: a class D amplifier including a high side transistor and a low side transistor; a high side driver configured to drive the high side transistor; and a low side driver configured to drive the low side transistor, as a pair, wherein the low side driver is configured so that a time for turning off the low side transistor by the low side driver is longer than that for turning off the high side transistor by the high side driver.
    Type: Grant
    Filed: April 25, 2016
    Date of Patent: December 25, 2018
    Assignee: ROHM CO., LTD.
    Inventors: Hideki Munenaga, Hideo Araki
  • Patent number: 10141234
    Abstract: Various embodiments disclose a method for fabricating vertical transistors. In one embodiment, a structure is formed comprising at least a first substrate, an insulator layer on the substrate, a first doped layer on the insulator layer, at least one fin structure in contact with the doped layer, a dielectric layer surrounding a portion of the fin structure, a gate layer on the dielectric layer, a second doped layer in contact with the fin structure, a first contact area in contact with the second doped layer, and at least a first interconnect in contact with the first contact area. The structure is flipped bonded to a second substrate. The first substrate and the insulator layer are removed to expose the first doped layer. A second contact area is formed in contact with the first doped layer. At least a second interconnect is formed in contact with the second contact area.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: November 27, 2018
    Assignee: International Business Machines Corporation
    Inventors: Kangguo Cheng, Xin Miao, Wenyu Xu, Chen Zhang
  • Patent number: 10135408
    Abstract: Aspects of this disclosure relate to efficient power amplifiers, such as class-F power amplifiers. A power amplifier transistor can provide an amplified RF signal. A termination can be coupled to an output of the power amplifier transistor and configured to provide a short circuit at a second harmonic. In some instances, the termination circuit can provide an open circuit at a third harmonic. A resonant circuit can be coupled to the output terminal of the power amplifier transistor and configured to provide an open circuit at the third harmonic. In certain embodiments, an input termination circuit coupled to an input terminal of the power amplifier transistor can provide a short circuit at the second harmonic. The power amplifiers of this disclosure can be implemented, for example, in envelope tracking applications.
    Type: Grant
    Filed: October 17, 2016
    Date of Patent: November 20, 2018
    Assignee: Skyworks Solutions, Inc.
    Inventors: Haibo Cao, Andy Cheng Pang Wu, Yu-Jui Lin, Joel Richard King
  • Patent number: 10110180
    Abstract: Systems and method for improving operation of a radio frequency system are provided. One embodiment includes a switching power amplifier that outputs an amplified analog electrical signal based on an input electrical signal and voltage of an envelope voltage supply rail. The switching power amplifier includes a first transistor with a gate that receives the input electrical signal, a source electrically coupled to the envelope voltage supply rail, and a drain electrically coupled to an output of the switching power amplifier; a second transistor with a gate that receives the input electrical signal, a source electrically coupled to ground, and a drain electrically coupled to the output; and a third transistor with a gate that receives the input electrical signal, a drain electrically coupled to the envelope voltage supply rail, and a source electrically coupled to an output of another switching power amplifier.
    Type: Grant
    Filed: January 9, 2017
    Date of Patent: October 23, 2018
    Assignee: Apple Inc.
    Inventors: Ehsan Adabi, Albert C. Jerng
  • Patent number: 10110120
    Abstract: A boost DC-DC power converter comprising a semiconductor switch arrangement comprising a plurality of series connected semiconductor switches. A first capacitor is connected between a first intermediate node of a first leg of the semiconductor switch arrangement and a second intermediate node of a second leg of the semiconductor switch arrangement. A control circuit is coupled to respective control terminals of the plurality of semiconductor switches. A load sensor is configured to detect a load current and/or a load voltage of a load circuit connectable to at least a first DC output voltage of the DC-DC power converter. The control circuit being further configured to adjusting one or more operational parameters of the boost DC-DC power converter based on the detected load current and/or load voltage.
    Type: Grant
    Filed: May 4, 2017
    Date of Patent: October 23, 2018
    Assignee: Infineon Technologies Austria AG
    Inventor: Mikkel Høyerby
  • Patent number: 10090771
    Abstract: A power amplifier device includes first and second pairs of semiconductor switches, transformers, and a zero-crossing detection circuit for detecting a zero voltage crossing of an analog input signal. The switches of the first pair receive a respective positive and negative component of the input signal. The transformers store energy from the positive and negative components, respectively. Each transformer releases accumulated energy when the respective switch of the first pair turns off The switches of the second pair have opposite switching states and are connected between a respective transformer and a load, e.g., a transducer, speak, or motor. Each switch receives released energy from the respective transformer. A switching state of each switch of the second pair changes in response to a detected zero voltage crossing of the input signal to transfer the released energy to the load. A system includes the device and the load.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: October 2, 2018
    Assignee: Sparton Corporation
    Inventors: Don Laturell, James Pleterski
  • Patent number: 10090813
    Abstract: A power amplifier includes an input amplifier, a comparator, a switching circuit, an output filter and a feedback filter. The input amplifier receives an input signal of the power amplifier at a positive input of the input amplifier and an output signal of the feedback filter at a negative input of the input amplifier. The input amplifier has a capacitive feedback from an output of the input amplifier to the negative input of the input amplifier. The comparator receives the output signal of the input amplifier at a positive input of the comparator and the output signal of the feedback filter at a negative input of the comparator. The comparator provides a control signal based on a comparison between signal levels of the signals at the positive and the negative inputs of the comparator.
    Type: Grant
    Filed: May 20, 2016
    Date of Patent: October 2, 2018
    Assignee: BOLECANO HOLDING AB
    Inventor: Patrik Boström
  • Patent number: 10085089
    Abstract: Systems and methods according to one or more embodiments are provided for sensing a current at an output of a switching amplifier. In one example, a system includes a first transistor switch coupled to a load configured to conduct a current in the load responsive to a first pulse width modulated control signal and a second transistor switch coupled to the load configured to conduct the current in the load responsive to a second pulse width modulated control signal. The system further includes a sample and hold circuit coupled between the load and a current sensing circuit configured to sample a voltage at the second transistor switch for a pre-determined sample time period in response to a midpoint of a second pulse width modulated control signal time period, and configured to provide the sampled voltage to the current sensing circuit.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: September 25, 2018
    Assignee: SYNAPTICS INCORPORATED
    Inventors: Dan Shen, Lorenzo Crespi, Davide Cartasegna
  • Patent number: 10063147
    Abstract: The present invention relates to a multiple output boost DC-DC power converter generating two, three or more separate DC output voltages, and to a multi-level power inverter and an alternating current generator both employing the multiple output boost DC-DC power converter.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: August 28, 2018
    Assignee: Infineon Technologies Austria AG
    Inventor: Mikkel Høyerby
  • Patent number: 10038416
    Abstract: A self-oscillating class D amplifier includes an integration circuit configured to integrate an input signal and output a result of the integration as an integrated signal, a comparator configured to receive the integrated signal at an inverting input terminal and output a pulse width modulation signal by comparing voltages of a non-inverting input terminal being grounded and the inverting input terminal, a switching circuit configured to power-amplify the pulse width modulation signal output from the comparator, a low-pass filter configured to extract an amplified output signal from the power-amplified pulse width modulation signal, a first feedback circuit configured to feed back the output signal of the low-pass filter to the inverting input terminal of the comparator, and a second feedback circuit configured to feed back the output signal of the low-pass filter to the integration circuit.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: July 31, 2018
    Assignee: YAMAHA CORPORATION
    Inventors: Takeshi Togawa, Masao Noro
  • Patent number: 10018658
    Abstract: A circuit includes a final stage that includes an H-bridge comprising first and second half-bridges. A read circuit is configured to read a load current supplied by a class-D audio-amplifier to a load. The read circuit is configured for estimating the load current by reading a current at an output by the first or second half-bridge by measuring a drain-to-source voltage during an ON period of a power transistor of the H-bridge. A sensing circuit is configured to detect a first drain-to-source voltage from a transistor of the first half-bridge and a second drain-to-source voltage from a corresponding transistor of the second half-bridge. The sensing circuit is also configured to compute a difference between the first drain-to-source voltage and the second drain-to-source voltage and to perform an averaging operation on the difference to obtain a sense voltage value to be supplied to an analog-to-digital converter.
    Type: Grant
    Filed: July 16, 2016
    Date of Patent: July 10, 2018
    Assignee: STMicroelectronics S.r.l.
    Inventors: Edoardo Botti, Marco Raimondi
  • Patent number: 10015608
    Abstract: In one general aspect, a method can include calculating, at a calibration temperature of a speaker, a calibration parameter through a coil of the speaker in response to a first test signal, and can include sending a second test signal through the coil of the speaker. The method can also include measuring a parameter through the coil of the speaker based on the second test signal, and calculating a temperature change of the coil of the speaker based on the parameter and based on the calibration parameter at the calibration temperature.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: July 3, 2018
    Assignee: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Philip Crawley, William D. Llewellyn, Majid Shushtarian, Earl D. Schreyer
  • Patent number: 10014827
    Abstract: A power-adjustable RF (radio frequency) output circuit is disclosed, which includes a RF frequency source transformer, wherein: one output end of the RF frequency source transformer is connected with a gate of a power amplifier module, another output end of the RF frequency source transformer is connected with a gate bias voltage control circuit; a source of the power amplifier module is connected with ground; the gate of the power amplifier module is connected with a resistor which is connected with ground, a drain of the power amplifier module is connected with a fixed voltage DC (direct current) power supply and also connected with a RF filtering network for outputting a RF power through the RF filtering network.
    Type: Grant
    Filed: May 10, 2017
    Date of Patent: July 3, 2018
    Assignee: Beijing BBEF Science & Technology Co., Ltd.
    Inventors: Xuewen Liu, Guangjian Li, Zhenyu Yuan, Nianxi Xue, Weize Li
  • Patent number: 10006976
    Abstract: According to one embodiment, a radio frequency coil unit includes cables, radio frequency coil elements and balun circuits. The cables correspond to channels. The radio frequency coil elements are directly or indirectly connected to the cables. The balun circuits suppress an influence of an unbalanced current flowing into partial radio frequency coil elements out of the radio frequency coil elements. A part of the cables pass through at least one of the balun circuits in contact with or in non-contact with at least one of the balun circuits.
    Type: Grant
    Filed: February 25, 2015
    Date of Patent: June 26, 2018
    Assignee: TOSHIBA MEDICAL SYSTEMS CORPORATION
    Inventors: Takahiro Ishihara, Sadanori Tomiha
  • Patent number: 9979354
    Abstract: The present invention relates in one aspect to a class D audio amplifier with improved output driver topology supporting multi-level output signals such as 3-level, 4-level or 5-level pulse width or pulse density modulated output signals for application to a loudspeaker load. The present class D audio amplifiers are particularly well-suited for high-volume consumer audio applications and solutions.
    Type: Grant
    Filed: November 4, 2016
    Date of Patent: May 22, 2018
    Assignee: Merus Audio ApS
    Inventor: Mikkel Høyerby
  • Patent number: 9973157
    Abstract: An apparatus and method are disclosed for providing output signal swings that are greater than the supply voltage in a class-D amplifier. The amplifier circuit boosts the voltage across the amplifier load, such as a loudspeaker, by using capacitors to “charge pump” the voltage across the load and thus increase the voltage temporarily. This is done by using two or more output bridges rather than one, and connecting the bridges through the capacitors. For signals of less than the supply voltage, only an inner bridge, similar to a full bridge of the prior art, operates. For signals above the supply voltage, an outer bridge charges capacitors, which are then used to ‘boost’ the voltage on the bridge output for the short period of the Class-D switching period. Thus, only relatively small value boosting capacitors are needed, as they do not need to supply charge for very long.
    Type: Grant
    Filed: September 10, 2016
    Date of Patent: May 15, 2018
    Assignee: ESS Technology, Inc.
    Inventors: Peter John Frith, Yongsheng Xu, A. Martin Mallinson, Robert Lynn Blair
  • Patent number: 9970963
    Abstract: A temperature compensated current measurement device comprises a Rogowski coil having a terminating impedance arranged to adjust the attenuation of the coil to balance changes in coil sensitivity so that the output voltage indicative of measured current remains substantially unchanged, the terminating impedance having different values above and below a threshold frequency.
    Type: Grant
    Filed: February 1, 2013
    Date of Patent: May 15, 2018
    Assignee: Power Electronic Measurements Limited
    Inventors: William Frederick Ray, Christopher Rene Hewson, Joanne Marie Aberdeen
  • Patent number: 9955257
    Abstract: The present disclosure relates to a class-D audio amplifier. When the class-D audio amplifier is powered on, an auxiliary power amplifier and an auxiliary feedback circuit constitute an auxiliary close loop so that a control loop is established in advance. The auxiliary close loop is disconnected after various circuit modules reach their steady operation points, and the class-D audio amplifier operates at a normal state. A soft start circuit is provided for suppressing noise which occurs when the class-D audio amplifier is powered on. Thus, the class-D audio amplifier suppresses POP noise at an output terminal when the class-D audio amplifier is powered on.
    Type: Grant
    Filed: August 18, 2016
    Date of Patent: April 24, 2018
    Assignee: SILERGY SEMICONDUCTOR TECHNOLOGY (HANGZHOU) LTD.
    Inventors: Huaping Zhu, Hejinsheng Cao, Qichang Wu, Zhenguo Sun
  • Patent number: 9948350
    Abstract: Circuitry includes a first RF power amplifier, a second RF power amplifier, a third RF power amplifier, a first bias signal generator, and a second bias signal generator. The first RF power amplifier and the second RF power amplifier are each configured to amplify RF signals for transmission in a first carrier network. The third RF power amplifier is configured to amplify RF signals for transmission in a second carrier network. In a first mode, the first bias signal generator provides a bias signal to the first RF power amplifier and the second bias signal generator provides a bias signal to the second RF power amplifier. In a second mode, the first bias signal generator and the second bias signal generator each provide a portion of a bias signal to the third RF power amplifier.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: April 17, 2018
    Assignee: Qorvo US, Inc.
    Inventors: Jean-Frederic Chiron, Nadim Khlat
  • Patent number: 9929704
    Abstract: An amplifier includes an amplifier circuit comprising a switch, the switch configured to provide an output signal responsive to an input signal, the output signal comprising a first output signal at a fundamental frequency and a second signal at a second harmonic of the fundamental frequency, the input signal configured to control the switch according to a nominal 25% off, 75% on cycle, a filter circuit configured to control an impedance presented to the amplifier circuit and a load circuit, at least a part of which is configured to combine with the filter circuit to form an impedance transformation circuit configured to be resonant at the second harmonic of the fundamental frequency.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: March 27, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Gabriel Isaac Mayo, Charles Edward Wheatley, Phuong Huynh
  • Patent number: 9921254
    Abstract: A circuit for measuring a bandwidth of an amplifier includes a switch-capacitor circuit and a controller. The switch-capacitor circuit is coupled to an output and an input of the amplifier. The switch-capacitor circuit is switchable between a sampling mode and an amplification mode. The controller is coupled to the switch-capacitor circuit and the output of the amplifier. The controller is configured to switch the switch-capacitor circuit between the sampling mode and the amplification mode, control the amplification mode to have various durations, and determine the bandwidth of the amplifier based on the various durations of the amplification mode and corresponding voltages at the output of the amplifier.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: March 20, 2018
    Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD.
    Inventors: Yung-Chow Peng, Chih-Chiang Chang, Wen-Shen Chou, Brady Yang
  • Patent number: 9906196
    Abstract: A switching power stage for producing a load voltage may include a first processing path having a first output, a second processing path having a second output, a first plurality of switches comprising at least a first switch coupled between the first output and a first load terminal and a second switch coupled between the first output and the second load terminal, a second plurality of switches comprising at least a third switch coupled between the second output and the first load terminal and a fourth switch coupled between the second output and the second load terminal, and a controller configured to control switches in order to generate the load voltage as a function of an input signal such that one of the first switch and the second switch operates in a linear region of operation and one of the third switch and the fourth switch operates in a saturated region of operation for a predominance of a dynamic rage of the load voltage.
    Type: Grant
    Filed: September 20, 2016
    Date of Patent: February 27, 2018
    Assignee: Cirrus Logic, Inc.
    Inventors: Zhaohui He, Eric J. King, Siddharth Maru, John L. Melanson
  • Patent number: 9885765
    Abstract: The present invention provides an apparatus and a method for amplifying a radio-frequency signal and an MRI system comprising the apparatus.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: February 6, 2018
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Keqiu Zeng, Yong Liu, Tao Wang
  • Patent number: 9887670
    Abstract: A power supply circuit (10) includes: a linear amplifier (11) for generating a linear amplification signal based on an input signal; a first switching amplifier (12) for generating a first switching amplification signal of a first frequency band based on the linear amplification signal; a second switching amplifier (13) for generating a second switching amplification signal of a second frequency band based on the first switching amplification signal; and a power supply unit (14) for supplying a combined signal in which the linear amplification signal and the first and second switching amplification signals are combined to an external circuit as a power supply. It is therefore possible to improve the power efficiency.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: February 6, 2018
    Assignee: NEC CORPORATION
    Inventor: Kiyohiko Takahashi
  • Patent number: 9880920
    Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for providing a user with feedback regarding power consumption in a battery-operated electronic device. In one aspect, a method performed by data processing apparatus includes identifying, using the data processing apparatus, usage of a hardware component of a battery-operated electronic device that includes the data processing apparatus, attributing the usage of the hardware component to the hardware component or to a software application that uses the hardware component, recording, using the data processing apparatus, a power consumption resulting from the usage, and presenting power consumption feedback to a user using the data processing apparatus. The power consumption feedback identifies the hardware component or the software application of the electronic device and the power consumption resulting from the usage.
    Type: Grant
    Filed: October 1, 2012
    Date of Patent: January 30, 2018
    Assignee: Google LLC
    Inventors: Dianne K. Hackborn, Daniel S. Rice, Amith Yamasani, Jason B. Parks, Evan Millar
  • Patent number: 9831839
    Abstract: A method for producing an output voltage to a load may include, in a power stage comprising power converter having a power inductor, a plurality of switches arranged to sequentially operate in a plurality of switch configurations, and an output for producing the output voltage comprising a first output terminal and a second output terminal, controlling the linear amplifier to transfer electrical energy from the input source of the power stage to the load in accordance with one or more least significant bits of a digital input signal, and controlling the power converter in accordance with bits of the digital input signal other than the one or more least significant bits to 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 the input source of the power stage to the load.
    Type: Grant
    Filed: March 7, 2017
    Date of Patent: November 28, 2017
    Assignee: Cirrus Logic, Inc.
    Inventors: Eric J. King, Christophe J. Amadi, John L. Melanson
  • Patent number: 9825616
    Abstract: A wave shaping circuit reduces slope magnitudes during increasing and decreasing voltage transitions. The wave shaping circuit includes a first switch that receives an input voltage having at least two voltage values where an input voltage transition between the at least two voltage values has a first slope magnitude; an inductor connected in series with the first switch; a second switch connected in a parallel arrangement with the first switch and the inductor; and a capacitor having a first end connected between the inductor and an output port and a second end connected to ground. When the input voltage begins the input voltage transition to a higher voltage value, the first switch turns on and the second switch turns off, such that the inductor limits current flow from the input voltage, decreasing a second slope magnitude of an output voltage transition to less than the first slope magnitude.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: November 21, 2017
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Michael Wendell Vice, Sungkil Hwang
  • Patent number: 9800235
    Abstract: A signal conditioner that includes a transition-detection module and a current-injection module. The transition-detection module is configured to receive a pair of differential signals from a data line and generate one or more comparator output signals and a transition-indication signal to indicate whether a transition has been detected on the differential signals. The current-injection module is configured to receive the comparator output signals and transition-indication signal from the transition-detection module, and generate appropriate currents for injection into the data line to boost edge rates of the differential signals when the transition-detection module detects a transition of the differential signals or remain high impedance when no transition occurs on the differential signals.
    Type: Grant
    Filed: May 29, 2015
    Date of Patent: October 24, 2017
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Yonghui Tang, M D Anwar Sadat, Hao Liu
  • Patent number: 9793807
    Abstract: A device and a method for power conversion to DC using zero-current and/or zero-voltage switching. Provides output voltage of any level and polarity. Operates with any input voltage, including DC and AC. Power loss is substantially eliminated. The conversion efficiency is independent of load consumption, from the idle to the maximum power. The EMI level is very low. Provides for input to output isolation without use of transformers.
    Type: Grant
    Filed: March 18, 2016
    Date of Patent: October 17, 2017
    Inventor: Boris Ablov
  • Patent number: 9794703
    Abstract: Presented herein are low-power active bone conduction devices that comprise an actuator that is subcutaneously implanted within a recipient so as to deliver mechanical output forces to hard tissue of the recipient. The low-power active bone conduction devices include an energy recovery circuit configured to extract non-used energy from the actuator and to store the non-used energy for subsequent use by the actuator. The low-power active bone conduction devices may also include a multi-bit sigma-delta converter that operates in accordance with a scaled sigma-delta quantization threshold value to convert received signals representative of sound into actuator drive signals.
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: October 17, 2017
    Assignee: Cochlear Limited
    Inventors: Werner Meskens, Wim Bervoets, Carl Van Himbeeck
  • Patent number: 9748907
    Abstract: An output impedance-matching network for an RF power amplifier die includes a harmonic-prevention circuit that functions like a short circuit at a fundamental frequency of the amplifier and an open circuit at a second harmonic frequency of the amplifier. In certain implementations, the harmonic-prevention circuit has one or more parallel, reactive (LC) legs that resonate at the fundamental frequency and a parallel, reactive (capacitive) leg that causes the harmonic-prevention circuit to resonate at the second harmonic frequency. The harmonic-prevention circuit improves power transfer and efficiency of the RF power amplifier.
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: August 29, 2017
    Assignee: NXP USA, INC.
    Inventors: Wenming Li, Yunfei Wang, Qi Wu
  • Patent number: 9722544
    Abstract: Embodiments of the disclosure may include a method and apparatus for improving the efficiency and extending the operation time between recharges or replacement batteries of a portable audio delivery system. The audio delivery system may include a processor, an audio processing device, a speaker, and a rechargeable power source. The audio delivery system is generally configured to generate and/or receive an audio input signal and efficiently deliver an amplified, high quality audio output signal to a user. In some embodiments of the disclosure, the audio processing device of the audio delivery system may include a switch mode power supply (SMPS), a signal delay element, an envelope detector, and a switching signal amplifier.
    Type: Grant
    Filed: December 2, 2016
    Date of Patent: August 1, 2017
    Assignee: Logitech Europe S.A.
    Inventors: Alan Olson, Sean Chiu, Jianhua Pan, Constantine Mouzakis, Jeffrey Anderson, Patrick Nicolet
  • Patent number: 9705453
    Abstract: Circuits and devices related to multi-harmonic control of amplified signals. In some embodiments, an amplifier circuit assembly can include an amplifier configured to provide a signal at an output. The amplifier circuit assembly can further include a matching network configured to provide impedance matching for the signal having a fundamental frequency, a broadband harmonic trap configured to substantially trap a plurality of harmonics associated with the fundamental frequency, and a dipole network configured to tune reactances associated with the broadband harmonic trap. The matching network, the broadband harmonic trap and the dipole network can be implemented in series from the output of the amplifier.
    Type: Grant
    Filed: August 15, 2016
    Date of Patent: July 11, 2017
    Assignee: Skyworks Solutions, Inc.
    Inventor: Ramon Antonio Beltran Lizarraga
  • Patent number: 9692304
    Abstract: An integrated power stage device includes a switch node that is coupled to an output inductor. The integrated power stage device generates a monitor current that is a scaled version of the current through the output inductor. The integrated power stage device outputs a single-ended offset monitor current that is equal to the monitor current plus a DC offset current. A PWM controller senses the current through the output inductor by receiving a monitor voltage that is developed from the offset monitor current. The PWM controller generates a PWM signal in accordance with the sensed output inductor current to control a switching operation of a power switch of the integrated power stage device.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: June 27, 2017
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Jo Luo, Jon Gladish
  • Patent number: 9673853
    Abstract: Cascode power amplifier with voltage limiter. A power amplification system can include an input transistor having an input transistor gate configured to receive a radio-frequency (RF) signal, an input transistor source coupled to a ground voltage, and an input transistor drain. The power amplification can further include an output transistor having an output transistor drain configured to output an amplified version of the RF signal, an output transistor gate coupled to a bias voltage, and an output transistor source. The power amplification system can further include a high voltage limiter coupled between the output transistor drain and output transistor gate. The high voltage limiter can be configured to prevent a gate-drain voltage of the output transistor from exceeding a high voltage threshold.
    Type: Grant
    Filed: August 18, 2015
    Date of Patent: June 6, 2017
    Assignee: Skyworks Solutions, Inc.
    Inventor: Gregory A. Blum
  • Patent number: 9634776
    Abstract: A mobile communication device may use sensor data to identify the current device state based on sensor data, device parameter values and/or device usage data. The mobile communication device may then measure the impedance value of a characteristic circuit, such as the antenna or the power amplifier. Responsive to determining that the measured impedance value differs from a pre-defined base impedance value by more than a certain threshold value, the mobile communication device may retrieve, from a memory, a set of envelope tracking (ET) parameter values corresponding to the current state of the communication device and the measured impedance value. The mobile communication device may calculate, using the retrieved ET parameter values, a target supply voltage to be applied to the power amplifier.
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: April 25, 2017
    Assignee: Amazon Technologies, Inc.
    Inventors: Morris Yuanhsiang Hsu, Mudit Sunilkumar Khasgiwala, Peruvemba Ranganathan Sai Ananthanarayanan
  • Patent number: 9628033
    Abstract: A method for producing an output voltage to a load may include, in a power stage comprising power converter having a power inductor, a plurality of switches arranged to sequentially operate in a plurality of switch configurations, and an output for producing the output voltage comprising a first output terminal and a second output terminal, controlling the linear amplifier to transfer electrical energy from the input source of the power stage to the load in accordance with one or more least significant bits of a digital input signal, and controlling the power converter in accordance with bits of the digital input signal other than the one or more least significant bits to 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 the input source of the power stage to the load.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: April 18, 2017
    Assignee: Cirrus Logic, Inc.
    Inventors: Eric J. King, Christophe J. Amadi, John L. Melanson
  • Patent number: 9628040
    Abstract: This application relates to Class D amplifier circuits (200). A modulator (201) controls a Class D output stage (202) based on a modulator input signal (Dm) to generate an output signal (Vout) which is representative of an input signal (Din). An error block (205), which may comprise an ADC (207), generates an error signal (?) from the output signal and the input signal. In various embodiments the extent to which the error signal (?) contributes to the modulator input signal (Dm) is variable based on an indication of the amplitude of the input signal (Din). The error signal may be received at a first input (204) of a signal selector block (203). The input signal may be received at a second input (206) of the signal selector block (203).
    Type: Grant
    Filed: August 26, 2015
    Date of Patent: April 18, 2017
    Assignee: Cirrus Logic International Semiconductor Ltd.
    Inventors: John Paul Lesso, Toru Ido
  • Patent number: 9602070
    Abstract: The power amplifying device includes a first potential line to which a first potential is supplied, a second potential line to which a second potential that is lower than the first potential is supplied and a third potential line to which a third potential that is between the first potential and the second potential is supplied. The power amplifying device includes a first BTL amplifier unit. The power amplifying device includes a second BTL amplifier unit. The power amplifying device includes a third BTL amplifier unit. The power amplifying device includes a fourth BTL amplifier unit that has a seventh output amplifier and an eighth output amplifier.
    Type: Grant
    Filed: September 8, 2015
    Date of Patent: March 21, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hiroyuki Tsurumi
  • Patent number: 9590571
    Abstract: A single-stage buffer apparatus includes a first transistor, a second transistor, and a high pass filter network. The first transistor is configured to receive an input signal from a microphone. The second transistor is configured to operate as a cascode transistor. The high pass filter network is coupled to the first transistor and the second transistor. The second transistor electrically decouples the first transistor from an output of the single-stage buffer apparatus. A gate terminal of the second transistor is driven by the high-pass filter network, and the high-pass filter network is driven by the first transistor.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: March 7, 2017
    Assignee: Knowles Electronics, LLC
    Inventors: Michael Jennings, Craig Stein, Dean Badillo
  • Patent number: 9590665
    Abstract: A transmitter in a wireless communication system is provided. The transmitter includes a baseband signal processor for detecting an envelope signal, a supply modulator (SM) for producing power to be supplied to a power amplifier using the detected envelope signal, and the power amplifier for receiving voltage from the SM and for amplifying power of a transmit signal. The SM generates a compensation signal corresponding to switching noise generated via switching amplification, and adds the compensation signal and the switching noise. The amplifier of the wireless communication system can produce low switching noise, and the envelope tracking power amplifier can prevent reception degradation due to the noise of the supply modulator.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: March 7, 2017
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hyung-Sun Lim, Seung-Chul Lee, Thomas Byung-Hak Cho, Ji-Seon Paek, Jun-Seok Yang, Jun-Hee Jung
  • Patent number: 9553449
    Abstract: A power supply apparatus includes: a plurality of input ports configured to receive input of electric power from a plurality of power sources, respectively; a charge and discharge circuit configured to receive the input electric power to be charged and discharged so as to generate electric power to be supplied to a load circuit; a switching circuit configured to individually switch connections between the plurality of input ports and the charge and discharge circuit; and a control circuit configured to perform control so as to give different timing of the switch among the input ports.
    Type: Grant
    Filed: April 17, 2015
    Date of Patent: January 24, 2017
    Assignee: FUJITSU LIMITED
    Inventor: Yuji Tajiri
  • Patent number: 9548706
    Abstract: The power stage at the output of a high-frequency generates operates in class D and comprises a voltage supply and a common earth, a first and a second switch linked to the common earth and periodically switched on at a high frequency F; these switches are linked to two common-mode inductors connected in a Guanella balun. Each common-mode inductor comprises two inductive lines with strong mutual coupling.
    Type: Grant
    Filed: June 3, 2014
    Date of Patent: January 17, 2017
    Assignee: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
    Inventors: Thierry Thomas, Vincent Josselin
  • Patent number: 9520850
    Abstract: Techniques for providing multiple power supplies in electronic devices are disclosed. According to one aspect of the present invention, an appropriate power supply is provided only to accommodate a volume setting. In other words, there are at least two power supplies, one with a low voltage and the other with a high voltage. The high voltage power supply is only applied when there is a need to accommodate a volume setting. Thus the power consumption of the amplifiers is well controlled. As a result, the designs of the device and heat dissipation therein can be simplified and lowered in cost.
    Type: Grant
    Filed: September 17, 2014
    Date of Patent: December 13, 2016
    Assignee: Sonos, Inc.
    Inventors: James F. Lazar, Mark Polomski