Including Class D Amplifier Patents (Class 330/251)
  • Patent number: 10674280
    Abstract: A hearable has an audio amplifier circuit coupled to a speaker as a load. The amplifier circuit has current source drive, which attenuates electromagnetically coupled noise of the speaker. In other instances, the amplifier circuit has a first amplifier mode and a second amplifier mode, wherein in the first amplifier mode the amplifier circuit becomes configured to drive the speaker as a voltage source, and in the second amplifier mode the amplifier circuit becomes configured to drive the speaker as a current source. Control logic varies the amplifier circuit between i) the first amplifier mode for larger amplitudes of the audio signal, and ii) the second amplifier mode for smaller amplitudes of the audio signal. Other aspects are also described and claimed.
    Type: Grant
    Filed: September 27, 2018
    Date of Patent: June 2, 2020
    Assignee: APPLE INC.
    Inventors: Michael B Nussbaum, Roderick B Hogan, Todd K Moyer
  • Patent number: 10666300
    Abstract: Described herein are systems configured for inter-band carrier aggregation. Systems include a multiplexing circuit having a switching network and diplexers wherein the switching network is configured to share inductors between multiple paths of the multiplexing circuit. The filters can be designed so that when operated simultaneously (e.g., during multi-band operation) the same inductance can be used allowing the switching network to switch in a particular inductance into the path. The described systems can include an inductance that is coupled to an output port so that when operating in single-band mode, the different paths share the same inductance. Relative to other solutions, the described systems can improve performance (e.g., reduce insertion loss), reduce the number of components in the associated module, reduce manufacturing costs, and the like.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: May 26, 2020
    Assignee: SKYWORKS SOLUTIONS, INC.
    Inventors: Stephane Richard Marie Wloczysiak, Phi Nguyen Dang
  • Patent number: 10637405
    Abstract: A radio frequency (RF) amplifier circuit includes an amplifier device and a first baseband bias circuit. The amplifier device includes a first input configured to receive a first signal to be amplified and a first output configured to output a first amplified signal. The first baseband bias circuit includes an input coupled to the first output of the amplifier device. The first baseband bias circuit includes a first envelope decoupling circuit and a first harmonic decoupling circuit. The first envelope decoupling circuit includes a first bulk capacitor and a first distributed inductor configured to resonate in a baseband frequency range. The first harmonic decoupling circuit includes a second bulk capacitor and a second distributed inductor configured to resonate at a harmonic frequency of the frequency of the first signal received at the input of the amplifier device.
    Type: Grant
    Filed: August 14, 2018
    Date of Patent: April 28, 2020
    Assignee: NXP USA, Inc.
    Inventors: Arturo Roiz, Justin Nelson Annes, Terry L. Thomas
  • Patent number: 10637409
    Abstract: A power amplifier circuit includes a power amplifier that amplifies an input signal and outputs the amplified signal from an output terminal thereof, a first filter circuit that has a frequency characteristic that attenuates an Nth-order harmonic of the amplified signal, N that is an integer greater than or equal to 2, and a second filter circuit that has a frequency characteristic that attenuates the Nth-order harmonic of the amplified signal. The first filter circuit includes a first capacitor and a first inductor. The first capacitor and the first inductor are connected in series between the output terminal and ground. The second filter circuit includes a second capacitor and a second inductor. The second capacitor and the second inductor are connected in series between the output terminal and ground.
    Type: Grant
    Filed: August 27, 2018
    Date of Patent: April 28, 2020
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Takashi Yamada, Yuuri Honda, Satoshi Tanaka
  • Patent number: 10622943
    Abstract: An oscillator, including a resonance circuit, a cross coupled current source circuit, and a positive feedback circuit coupled between the current source circuit and the resonance circuit, where the resonance circuit is configured to generate a differential oscillation signal having a first oscillation frequency, the positive feedback circuit is configured to receive the differential oscillation signal, and amplify a gain of the differential oscillation signal to obtain a differential output oscillation signal, and the current source circuit is configured to provide an adjustable bias current for the resonance circuit and the positive feedback circuit.
    Type: Grant
    Filed: December 26, 2018
    Date of Patent: April 14, 2020
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Kai Shi, Lei Lu, Lei Xie
  • Patent number: 10615888
    Abstract: Disclosed is a passive intermodulation (PIM) test system having a pulsed signal generator configured to generate and apply a pulsed stimulus signal to a device under test. The PIM test system is further configured to measure a power of at least one PIM product generated by a PIM source in the device under test using the pulsed stimulus signal. Also disclosed in a method for evaluating PIM in a device under test, the method includes using a pulsed stimulus signal to measure a power of at least one PIM product generated by a PIM source in the device under test.
    Type: Grant
    Filed: June 14, 2016
    Date of Patent: April 7, 2020
    Assignee: BIRD TECHNOLOGIES GROUP INC.
    Inventors: Timothy L. Holt, Timothy M. O'Brien
  • Patent number: 10609477
    Abstract: A boosted audio amplifier system includes a first digital interpolation filter configured to oversample an audio input signal at a first oversampling rate and includes a signal level detector having an input coupled to receive the oversampled audio input signal and configured to produce an audio input level signal. The system further includes a programmable delay buffer having inputs coupled to receive the oversampled audio input signal and a first delay signal. The programmable delay buffer adds a first delay to the oversampled audio input signal to produce a delayed input signal. The system also includes a first processor having inputs coupled to receive a battery voltage level signal, the audio input level signal and the first delay signal. The first processor is configured to produce boost control signals to regulate a boost voltage.
    Type: Grant
    Filed: June 18, 2019
    Date of Patent: March 31, 2020
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Jasjot Singh Chadha, David Hernandez, Mukund Navada Kanyana, Rejin Kanjavalappil Raveendranath, Sahiti Priya C
  • Patent number: 10594313
    Abstract: Systems and methods for adaptive modulation of MOSFET driver key parameters for improved voltage regulator efficiency and reliability in a voltage regulator may include a power stage. The power stage may include a high side switch including a high side gate, a peak voltage detection circuit, and a high side driver strength modulator circuit. The high side driver strength modulator circuit may determine a high side driver strength level. The high side driver strength modulator circuit may also connect a subset of the set of high side gate drivers to the high side gate based on the high side driver strength level. The high side driver strength modulator circuit may also disconnect a remaining subset of the set of high side gate drivers from the high side gate.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: March 17, 2020
    Assignee: Dell Products L.P.
    Inventors: Kejiu Zhang, Shiguo Luo, Ralph H. Johnson
  • Patent number: 10587226
    Abstract: An amplifier device includes an input terminal, an output terminal, a first transistor having a control terminal and first and second current-carrying terminals, and a class-J circuit coupled between the second current-carrying terminal of the first transistor and the output terminal and configured to harmonically terminate the first transistor. The class-J circuit may include a first resonator, characterized by a first resonant frequency substantially equal to a second harmonic frequency. The first resonator may be coupled between the second current-carrying terminal and a voltage reference. A shunt inductor that is distinct from the first resonator may be coupled between the second current-carrying terminal and the voltage reference.
    Type: Grant
    Filed: March 20, 2018
    Date of Patent: March 10, 2020
    Assignee: NXP USA, Inc.
    Inventors: Maruf Ahmed, Margaret A. Szymanowski, Joseph Staudinger
  • Patent number: 10547275
    Abstract: A new method for amplifying signals having higher bandwidth, lower T.H.D., higher efficiency, smaller circuit size and lower costs in design, has been developed. A clipped signal is amplified to smaller pieces and each smaller part is amplified. Adding clipped amplified signals to each other, the main amplified signal is generated.
    Type: Grant
    Filed: December 29, 2017
    Date of Patent: January 28, 2020
    Inventor: Alireza Alemi
  • Patent number: 10498229
    Abstract: A method to soft start a charge pump circuit according to embodiments includes enabling switching for a plurality of power transistors, selecting a first switching control signal from a plurality of switching control signals for the selected plurality of power transistors, slowly ramping up a plurality of bootstrap supply voltages associated with the selected plurality of power transistors, driving a gate-to-source voltage of each power transistor of the selected plurality of power transistors at a first predefined level, and determining if the plurality of bootstrap supply voltages are less than a second predefined level. If the plurality of bootstrap supply voltages are less than the second predefined level, the method further includes toggling and thereby selecting a second switching control signal from the plurality of switching control signals for a second selected plurality of power transistors.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: December 3, 2019
    Assignee: Intersil Americas LLC
    Inventors: Eric Magne Solie, Mehul Shah, Bin Li, Paul K. Sferrazza
  • Patent number: 10476444
    Abstract: A system may include a plurality of playback paths comprising an open-loop playback path configured to drive an output load and a closed-loop playback path. The closed-loop playback path may include an outer feedback loop comprising one or more integrators, a quantizer, and an output driver for driving the output load, the outer feedback loop having an outer loop feedback gain and an inner feedback loop comprising the one or more integrators and the quantizer and excluding the output driver, wherein the inner feedback loop has a variable inner loop feedback gain which is adjustable to match the outer loop feedback gain.
    Type: Grant
    Filed: September 26, 2018
    Date of Patent: November 12, 2019
    Assignee: Cirrus Logic, Inc.
    Inventors: Tejasvi Das, Xin Zhao, Ku He, Nishant Jain, Lei Zhu, Xiaofan Fei
  • Patent number: 10461699
    Abstract: The present document describes a digital power amplifier configured to provide an amplified output signal at an output port based on an input signal. The power amplifier comprises a drive unit configured to generate a high side drive signal comprising a sequence of pulses for controlling the high side switch and a low side drive signal comprising a sequence of pulses for controlling the low side switch, respectively. The drive signals are generated such that the pulses of the high side drive signal are non-overlapping with regards to the pulses of the low side drive signal, and such that the sequence of pulses of the high side drive signal and the sequence of pulses of the low side drive signal have a reduced fraction of energy from higher order harmonics compared to a sequence of rectangular shaped pulses.
    Type: Grant
    Filed: January 3, 2019
    Date of Patent: October 29, 2019
    Assignee: Dialog Semiconductor B.V.
    Inventors: Mahbub Reja, Shobak Kythakyapuzha
  • Patent number: 10445540
    Abstract: Systems and methods for a distributed antenna network are provided. One system includes a plurality of antenna modules coupled via a communication line, with each antenna module configured to be switched between a through state and a connected state using radio-frequency identification (RFID) control signals. The system further includes a plurality of antennas, with each antenna connected to a corresponding antenna module. A controller is coupled to the communication line and configured to transmit RFID control signals to the plurality of antenna modules to selectively activate one of the antenna modules by switching the antenna module to the connected state to thereby activate an antenna connected to the antenna module in the connected state.
    Type: Grant
    Filed: December 17, 2018
    Date of Patent: October 15, 2019
    Assignee: INTERMEC, INC.
    Inventors: Rene Martinez, Pavel Nikitin, Stephen J. Kelly, Jason Harrigan
  • Patent number: 10447217
    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: January 31, 2018
    Date of Patent: October 15, 2019
    Assignee: Cirrus Logic, Inc.
    Inventors: Xin Zhao, Tejasvi Das, Xiaofan Fei, Alan Mark Morton
  • Patent number: 10404312
    Abstract: The present disclosure relates to a signal processing apparatus capable of reducing a circuit scale when transmitting and receiving a signal from an antenna. A first n-type MOS transistor amplifies a transmission signal to be transmitted from the antenna. A second n-type MOS transistor supplies a reception signal to be received from the antenna to a reception circuit. The first n-type MOS transistor and the second n-type MOS transistor are connected to the antenna in series. Furthermore, the reception circuit is connected to a contact between the first n-type MOS transistor and the second n-type MOS transistor. The present disclosure is capable of being applied to, for example, a radio transceiver.
    Type: Grant
    Filed: May 20, 2016
    Date of Patent: September 3, 2019
    Assignee: SONY CORPORATION
    Inventors: Naoto Yoshikawa, Shinya Tada
  • Patent number: 10397701
    Abstract: A system includes a class D amplifier and a current steering digital-to-analog converter (DAC) directly connected to the class D amplifier. The system also includes a common mode servo circuit coupled to a node interconnecting the current steering DAC to the class D amplifier. The common servo circuit amplifies a difference between a common mode signal determined from the node and a reference voltage and generates a feedback current to the node based on the amplified difference. A feed-forward common-mode compensation circuit is included to reduce an alternating current (AC) ripple from the class D amplifier. The feed-forward common-mode compensation circuit includes first and second resistors coupled to respective outputs of the class D amplifier. A current mirror is coupled to the first and second resistors and is configured to sink a current from the node to ground that approximates a common mode feedback current of the class D amplifier.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: August 27, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Lars Risbo, Ryan Erik Lind, Jasjot Singh Chadha
  • Patent number: 10320430
    Abstract: Described is an apparatus which comprises: a driver comprising a push-pull transmitter; a first circuitry to sense variation in a power supply; and a second circuitry coupled to the first circuitry and to the driver, the second circuitry to generate a code according to an output of the first circuitry, wherein the code is provided to the driver to adjust a performance parameter of the driver.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: June 11, 2019
    Assignee: Intel Corporation
    Inventor: Amit Kumar Srivastava
  • Patent number: 10320352
    Abstract: A class-D amplifier includes an output driver, a pulse width modulator, an integrator, and duty cycle control circuitry. The output driver is configured to drive a loudspeaker. The pulse width modulator is coupled to the output driver. The integrator is coupled to the pulse width modulator. The duty cycle control circuitry is coupled to the integrator. The duty cycle control circuitry is configured to monitor amplitude of output signal of the integrator, and change an average duty cycle of signal at an output of the output driver as a function of the amplitude.
    Type: Grant
    Filed: March 22, 2018
    Date of Patent: June 11, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Jianquan Liao, Xiuyuan Wang
  • Patent number: 10293174
    Abstract: Flexible subcutaneous implantable medical device (IMD), including an elongated and flexible body, a plurality of electronic components, at least one rechargeable battery, at least one antenna, at least one lead and at least one transition unit, the antenna for receiving and transmitting electromagnetic radiation and the lead for providing an electric shock, wherein the elongated and flexible body is structured from a plurality of units, wherein a first one of the plurality of units encapsulates the rechargeable battery, wherein each one of the other plurality of units respectively encapsulates a respective one of the plurality of electronic components, wherein the antenna is positioned in the transition unit, wherein the transition unit is covered with a biocompatible polymer, wherein the antenna receives electromagnetic radiation for recharging the rechargeable battery and wherein the antenna includes a copper coil having a generally cylindrical shape.
    Type: Grant
    Filed: June 7, 2017
    Date of Patent: May 21, 2019
    Assignee: NewPace Ltd.
    Inventors: Jack Amir, Moty Mocha, Gera Strommer, James Kelley, Avraham Broder
  • Patent number: 10298188
    Abstract: A class-D amplifier of an embodiment includes: a PWM modulator configured to output a PWM pulse based on an input signal; a first output transistor group, in which a connection point of complementarily operated two first output transistors is an output end; a second output transistor group, in which a connection point of complementarily operated two second output transistors is connected to the connection point of the first transistors; a driver circuit capable of driving the first output transistors and the second output transistors of the first and second output transistor groups, based on the PWM pulse from the PWM modulator; and a control circuit configured to generate a control signal for operating at least one of the first output transistor group and the second output transistor group.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: May 21, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Takafumi Kiyono
  • Patent number: 10289753
    Abstract: A method is provided for guiding locomotion speed in a human or other animal subject. The method comprises: estimating the subject's actual locomotion speed using one or more sensors to thereby obtain a measured speed; determining an error comprising a difference between a desired speed and the measured speed; and outputting, to the subject, a stimulus frequency signal wherein the stimulus frequency signal is based on the error in such a manner that when the subject ambulates in a manner that matches a frequency of the stimulus frequency signal, the subject's actual speed controllably tracks the desired speed.
    Type: Grant
    Filed: July 7, 2011
    Date of Patent: May 14, 2019
    Assignee: Simon Fraser University
    Inventors: Mark Snaterse, Sung Jae Chang, James Maxwell Donelan
  • Patent number: 10284155
    Abstract: A multi-level class D audio power amplifier for supplying an N-level drive signal to a loudspeaker. The multi-level class D audio power amplifier includes a switching matrix having controllable semiconductor switches where the switching matrix include at least (N?2) switch inputs, coupled to respective ones of (N?2) DC input voltage nodes, and at least 2*(N?2) switch outputs coupled to respective ones of 2*(N?2) intermediate nodes of a first output driver. A control circuit is configured to sequentially connect each of the (N?2) DC input voltages to a predetermined set of nodes of the 2*(N?2) intermediate nodes of the first output driver via the switching matrix in accordance with one or more of the 2*(N?1) modulated control signals of the first output driver. N is a positive integer larger than or equal to 3.
    Type: Grant
    Filed: December 28, 2015
    Date of Patent: May 7, 2019
    Assignee: Infineon Technologies Austria AG
    Inventor: Mikkel Høyerby
  • Patent number: 10270450
    Abstract: Methods and apparatus relate to a bidirectional differential interface having a voltage-mode transmit driver architecture formed of multiple selectively enabled slices for coarse output resistance impedance matching. In an illustrative example, the transmit driver may include a programmable resistance for fine-tuning to impedance match the output resistance for transmit operation. During receive operation, protective voltage may be proactively applied to gates of drive transistors, for example, to minimize voltage stresses applied by external signal sources. Some implementations may automatically float the sources of the drive transistors, for example, to prevent back-feeding externally driven signal currents during receive mode operations. The transmit driver may have programmable voltage swing on, for example, the upper and/or lower bounds to enhance compatibility. A programmable common mode voltage node may be selectively applied, for example, through common mode resistors for receive mode operations.
    Type: Grant
    Filed: August 23, 2018
    Date of Patent: April 23, 2019
    Assignee: XILINX, INC.
    Inventors: Shaojun Ma, Parag Upadhyaya, Didem Z. Turker Melek
  • 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: 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: 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: 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