Patents Examined by Henry Choe
  • Patent number: 10320350
    Abstract: In accordance with an embodiment, a radio frequency (RF) amplifier circuit includes a switchable capacitance circuit having a first terminal configured to be coupled to an input matching inductor. The switchable capacitance circuit is configured to provide a short circuit between the first and second terminals in a first state, and provide a first capacitive impedance between the first and second terminals in a second state. The RF amplifier also includes a low noise amplifier (LNA) having an input terminal coupled to the second terminal of the switchable capacitance circuit; and a bypass switch coupled to an output of the LNA, the second terminal of the switchable capacitance circuit, and an output of the RF amplifier circuit. The bypass switch is configured to select the output of LNA in the first state, and select the second terminal of the switchable capacitance circuit in the second state.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: June 11, 2019
    Assignee: INFINEON TECHNOLOGIES AG
    Inventors: Thomas Leitner, Daniel Schroegendorfer, Hans-Dieter Wohlmuth
  • Patent number: 10320349
    Abstract: Beamforming channels of a satellite are calibrated using a low power, spread spectrum calibration signal. The power of the calibration signal is below the noise level of a user signal in an active channel, allowing channels to be calibrated while active. When calibrating the transmit side circuitry, a two-stage calibration can be used, first calibrating the output hybrid matrix, then calibrating the whole of the transmit side. To improve performance, the dwell time spend calibrating a channel can be based on the power of the user signal in the channel. A transmit probe can be used to inject a calibration signal into the receive antennae and a receive probe can be used to extract the calibration signal from the transmit antennae. To reduce frequency of calibrations, the calibrations can be based on path-to-path differences. These techniques are also applied to multiport amplifiers (MPAs).
    Type: Grant
    Filed: March 20, 2018
    Date of Patent: June 11, 2019
    Assignee: Space Systems/Loral, LLC
    Inventors: Farid Elwailly, James Knecht, David Grybos
  • Patent number: 10320333
    Abstract: A radio frequency (RF) power combining amplifier circuit has a circuit input and a circuit output. A first amplifier is connected to the circuit input and to a first bias input. A first output matching network is connected to an output of the first amplifier and to the circuit output. A second amplifier is connected to the circuit input and to a second bias input. A second output matching network is connected to an output of the second amplifier, and to the circuit output. A voltage level of an input signal applied to the circuit input, together with the respective first bias input and the second bias input, selectively activates the first amplifier and the second amplifier.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: June 11, 2019
    Assignee: Skyworks Solutions, Inc.
    Inventor: Qiang Li
  • Patent number: 10312868
    Abstract: A fully differential amplifier includes a first feedback resistance, a second feedback resistance, a first input resistance and a second input resistance. A first ratio of the first feedback resistance to the first input resistance is equalized with that of a reference ratio of a pair of reference resistances. Similarly a second ratio of the second feedback resistance to the second input resistance is also equalized with that of the reference ratio. Such equalization operations may be performed during a calibration phase prior to normal operation of the fully differential amplifier. Accordingly, when a common mode voltage present on each of the first output terminal and the second output terminal varies during normal operation, contribution of an erroneous differential signal component across the pair of differential output terminals is prevented.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: June 4, 2019
    Assignee: AURA SEMICONDUCTOR PVT. LTD
    Inventors: Arnold J D'Souza, Shyam Somayajula
  • Patent number: 10305431
    Abstract: An apparatus includes a first amplifier having a first feedback resistance and an output configured to be coupled to a first input of a second amplifier having a second feedback resistance. The apparatus includes a third amplifier coupled to an input of the first amplifier and having an output configured to be coupled to a second input of the second amplifier.
    Type: Grant
    Filed: October 2, 2017
    Date of Patent: May 28, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Joung Won Park, Namsoo Kim
  • Patent number: 10298182
    Abstract: A radio frequency amplifier comprises a transistor, a transformer and a variable capacitor. The transistor has an input terminal, an output terminal and a control terminal. The transformer has a first coil conductor and a second coil conductor. The first coil conductor magnetically couples to the second coil conductor. The second coil conductor connects to the control terminal. The first coil conductor connects to the input terminal. The variable capacitor connects in parallel with the second coil conductor. An integrated circuit using the radio frequency amplifier is also introduced.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: May 21, 2019
    Assignee: NATIONAL CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Chia-Jen Liang, Yen-Cheng Kuan, Ching-Wen Chiang, Hung-Ting Chou
  • Patent number: 10291192
    Abstract: Apparatus and associated methods relate to a peaking module fabricated on a semiconductor substrate including a follower circuit driving a series peaking circuit-branch, the module configured to extend the bandwidth of a track-and-hold circuit. In an illustrative example, the series peaking circuit-branch may include an inductive element. One or more tracks on a metal interconnect above the semiconductor substrate may form the inductive element, for example. In some examples, one or more peaking modules may be combined creating a customized frequency response. In some examples, one or more combined peaking modules may be adjusted by a controller providing dynamic frequency response customization during operation. The follower circuits may employ constant current biasing and/or constant-gm biasing to provide substantial immunity to process, temperature and voltage variations, for example.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: May 14, 2019
    Assignee: XILINX, INC.
    Inventors: Ronan Casey, Chi Fung Poon, Ilias Chlis, Junho Cho
  • Patent number: 10291184
    Abstract: A tracker circuit configured to provide a variable supply voltage to a power amplifier (PA) circuit is disclosed. The tracker circuit comprises a predefined state machine circuit comprising a plurality of states mapped in accordance with transitions associated with a predefined mapping scheme. In some embodiments, the plurality of states of the state machine circuit identify one or more operational modes associated with the tracker circuit, wherein the one or more operational modes comprises one or more voltage levels respectively associated therewith. In some embodiments, the one or more operational modes comprises at least two active operational modes. In some embodiments, a transition between the one or more operational modes of the tracker circuit is dictated by a decoding of a digital selection signal received from a digital communication interface associated therewith.
    Type: Grant
    Filed: January 10, 2018
    Date of Patent: May 14, 2019
    Assignee: Intel IP Corporation
    Inventors: Ilan Sutskover, Eran Segev, Stephan Henzler, Alexander Belitzer
  • Patent number: 10284148
    Abstract: An RF amplifier is described including an input, an output, a parallel arrangement of a first branch and at least one further branch, each branch comprising a bipolar transistor in a degenerative emitter configuration having a base coupled to the input, a collector coupled to a common collector node, and an emitter degeneration impedance arranged between the emitter and a common rail. The common collector node is coupled to the output, the base of the first branch bipolar transistor is biased at a first bias voltage and the base of the at least one further branch bipolar transistor is biased at a bias voltage offset from the first bias voltage. In operation of the RF amplifier a IM3 distortion current output by the first branch bipolar transistor is in antiphase to a IM3 distortion current output by the at least one further branch bipolar transistor.
    Type: Grant
    Filed: January 8, 2018
    Date of Patent: May 7, 2019
    Assignee: NXP B.V.
    Inventors: Marco D'Avino, Mark Pieter van der Heijden, Michel Wilhelmus Arnoldus Groenewegen, Leonardus Cornelis Nicolaas de Vreede
  • Patent number: 10277169
    Abstract: In one embodiment an amplifier circuit is disclosed. The amplifier circuit comprises an amplifying device configured to amplify a radiofrequency signal, the amplifying device having an output dynamic range; a supply modulator configured to modulate a supply voltage supplied to the amplifying device when an output of the amplifying device is within a first region of the output dynamic range; a tuneable matching network coupled to an output of the amplifying device; and a load controller configured to control the tuneable matching network, when the output of the amplifying device is within a second region of the output dynamic range, and thereby modulate the load to which the output of the amplifying device is applied.
    Type: Grant
    Filed: May 27, 2015
    Date of Patent: April 30, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Konstantinos Mimis, Gavin Watkins
  • Patent number: 10277170
    Abstract: A radio frequency amplifier comprises a transistor, a transformer and a variable capacitor. The transistor has an input terminal, an output terminal and a control terminal. The transformer has a first coil conductor and a second coil conductor. The first coil conductor magnetically couples to the second coil conductor. The second coil conductor connects to the control terminal. The first coil conductor connects to the input terminal. The variable capacitor connects in parallel with the second coil conductor. The radio frequency amplifier is configured to be an input or output stage of an integrated circuit. An integrated circuit using the radio frequency amplifier is also introduced.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: April 30, 2019
    Assignee: NATIONAL CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Chia-Jen Liang, Yen-Cheng Kuan, Ching-Wen Chiang, Hung-Ting Chou
  • Patent number: 10277173
    Abstract: Certain aspects of the present disclosure provide methods and apparatus for amplifying signals with an amplification circuit. The amplification circuit generally includes a first transistor, an input path coupled between an input node of the amplification circuit and a control input of the first transistor, and a feedforward path coupled between the input node and a feedforward node. In certain aspects, the amplification circuit may also include a first resistive device coupled between the feedforward node and the control input of the first transistor, a biasing circuit coupled to the feedforward node, and a low-impedance path coupled to the feedforward node.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: April 30, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Joonhoi Hur, Paul Draxler
  • Patent number: 10277168
    Abstract: Systems, methods and apparatus for efficient power control and/or compensation with respect to a varying supply voltage of an RF amplifier for amplification of a constant envelope RF signal are described. A reduction in a size of a pass device of an LDO regulator is obtained by removing the pass device of the LDO regulator from a main current conduction path of the RF amplifier. Power control and/or compensation is provided by varying one or more gate voltages to cascoded transistors of a transistor stack of the RF amplifier according to a power control voltage. Various configurations for controlling the gate voltages are presented by way of a smaller size LDO regulator or by completely removing the LDO regulator. In a case where a supply voltage to the transistor stack varies, such as in a case of a battery, a compensation circuit is used to adjust the power control voltage in view of a variation of the supply voltage, and therefore null a corresponding drift/variation in output power of the RF amplifier.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: April 30, 2019
    Assignee: pSemi Corporation
    Inventor: David Kovac
  • Patent number: 10270397
    Abstract: The embodiments described herein provide wideband highly asymmetrical power efficient amplifier device that include a compact input power distribution network with input termination circuit. The input termination circuit is configured to provide control of the power distribution at the amplifier input. In one embodiment, the input termination circuit is configured to generate and reflect a frequency dependent portion of an input signal back toward the amplifier device inputs. This input reflection controls the input power distribution and shape of time domain input signal in a way that can affect amplifier device efficiency and linearity.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: April 23, 2019
    Assignee: NXP USA, Inc.
    Inventor: Igor Blednov
  • Patent number: 10270406
    Abstract: A power amplifier includes a main amplifier, an auxiliary amplifier, and a control circuit. The main amplifier is configured to amplify input power, and the auxiliary amplifier is configured to amplify the input power when the input power exceeds a certain level. The control circuit, which is provided between a source of the main amplifier and a ground, is configured to control a source potential of the main amplifier so as to increase the source potential when the input power reaches at least a certain value.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: April 23, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Masato Nishimori, Tatsuya Hirose, Ikuo Soga, Masayuki Hosoda, Tadahiro Imada
  • Patent number: 10270402
    Abstract: A system may include a radio frequency (RF) amplifier device that includes an input impedance matching network and first and second baseband decoupling circuits, which may remove intermodulation distortion products from signal energy input to the RF amplifier device at baseband frequencies. The input impedance matching network may act as a band-pass or low-pass filter. A gate bias voltage may be applied to the gate of a transistor in the RF amplifier device through one of the baseband decoupling circuits or, alternatively, at an input node of the RF amplifier device.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: April 23, 2019
    Assignee: NXP USA, Inc.
    Inventors: Damon G. Holmes, Jeffrey Kevin Jones, Ning Zhu, Jeffrey Spencer Roberts
  • Patent number: 10263568
    Abstract: A linearized power amplifier apparatus includes a number of amplifying stages to amplify a radio-frequency (RF) signal, and a feedback loop including a feedback circuit coupled between an output port of a last amplifying stage and an input port of a first amplifying stage. The feedback loop has a loop gain frequency response that peaks at a frequency approximately equal to a frequency of the RF signal. The feedback loop can provide a linear combination of a feedback signal and the RF signal to the input port of the first amplifying stage.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: April 16, 2019
    Assignee: Avaga Technologies International Sales PTE. Limited
    Inventor: Jeffrey Norwood Harrison
  • Patent number: 10243525
    Abstract: A power amplifier includes a carrier amplifier that operates from when an input signal is small, a peak amplifier that starts to operate when the input signal becomes large, a phase adjusting circuit that adjusts phases of an output of the carrier amplifier and an output of the peak amplifier, an impedance transforming line that transforms a load of the carrier amplifier when the input signal is small, and has a characteristic impedance close to an optimum load impedance of the carrier amplifier, and a circuit that is arranged between the output of the carrier amplifier and the impedance transforming line and reduces an output capacitance of the carrier amplifier.
    Type: Grant
    Filed: June 15, 2015
    Date of Patent: March 26, 2019
    Assignee: Hitachi Kokusai Electric Inc.
    Inventor: Toshiyuki Nagasaku
  • Patent number: 10236836
    Abstract: Methods and devices for tuning a configurable amplifier of a multi-band RF front-end stage based on a setting of a band switch are described. A lookup table provided with the configurable amplifier is used to map configuration control data of the band switch to configuration control data of the configurable amplifier. The configurable amplifier can be part of a transmit path or a receive path of the multi-band RF front-end stage.
    Type: Grant
    Filed: December 1, 2017
    Date of Patent: March 19, 2019
    Assignee: pSemi Corporation
    Inventors: Joseph Golat, David Kovac, Tero Tapio Ranta
  • Patent number: 10236844
    Abstract: According to an embodiment, an active inductor has a first conductivity type MOS transistor with a source that is connected to an electrical power source supply line and a drain that is connected to an output terminal. It has a capacitance between a gate of the first conductivity type MOS transistor and the electrical power source supply line. It has a diode element that is connected between a drain and a gate of the first conductivity type transistor. It has an electric current source that supplies a bias electric current in a forward direction to the diode element.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: March 19, 2019
    Assignee: Toshiba Memory Corporation
    Inventors: Yuta Tsubouchi, Junji Wadatsumi