Patents Examined by Hieu P Nguyen
  • Patent number: 10396718
    Abstract: Provided is a bias control circuit that includes: a reference voltage circuit that generates a reference voltage; a resistor; a temperature dependent current generating circuit that generates a temperature dependent current, which changes depending on temperature, on the basis of the reference voltage and that supplies the temperature dependent current to one end of the resistor; a reference voltage buffer circuit that applies the reference voltage to the other end of the resistor; a constant current generating circuit that generates a constant current, which is for driving the reference voltage buffer circuit, on the basis of the reference voltage and that supplies the constant current to the other end of the resistor; and a bias generating circuit that generates a bias voltage or a bias current for a power amplification circuit on the basis of the voltage at the one end of the resistor.
    Type: Grant
    Filed: January 15, 2018
    Date of Patent: August 27, 2019
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Yoshiaki Harasawa, Fuminori Morisawa
  • Patent number: 10389315
    Abstract: A receiver amplifier and also a receiver equalizer is provided for a three-level signaling system. The receiver amplifier includes a single current source that drives a current into node shared by three transistors arranged in parallel. A trio of input signals corresponds to the three transistors on a one-to-one basis. Each input signal drives the gate of its corresponding transistor. In addition, each transistor produces a corresponding output voltage at a terminal coupled to a resistor. The receiver equalizer includes three transistors and three corresponding equalizing pairs of a resistor and a capacitor. A terminal for the capacitor and for the resistor in each equalizing pair connects to a terminal of the corresponding transistor.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: August 20, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Chulkyu Lee, Shih-Wei Chou, Ying Duan
  • Patent number: 10389309
    Abstract: An amplifier arrangement comprises N amplifier stages comprising a main amplifier stage and a plurality of peaking amplifier stages. A transmission line comprises a varying impedance for transforming a load impedance to a higher impedance at the main amplifier stage, wherein the plurality of peaking amplifiers are coupled at intermediate locations to the transmission line. The amplifier arrangement is configured such that at least two of the peaking amplifiers are collectively driven with time delayed versions of substantially the same signal. The amplifier arrangement may be configured to operate with N?2 or fewer transition points in a Doherty mode of operation. As such, the amplifier arrangement may comprise more amplifier stages than are necessarily required in a Doherty amplifier arrangement having the same number of transition points.
    Type: Grant
    Filed: October 6, 2014
    Date of Patent: August 20, 2019
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventor: Richard Hellberg
  • Patent number: 10381990
    Abstract: In a preferred embodiment, the gain expansion in low power mode of a single chain PA is minimized by dynamically adjusting the output impedance of the bias circuit of each gain stage for each mode of operation. Instead of switching in a series attenuator or switching in additional feedback in the first gain stage of a single-chain PA to limit the gain at the increased quiescent current level, this embodiment achieves linear performance by adjusting the quiescent current in each stage to the minimum level that meets the target gain and then increasing the output resistance of the bias circuit of each gain stage in low power mode (LPM) to provide the appropriate level of negative feedback at the base of each amplifying HBT to linearize the gain versus power response.
    Type: Grant
    Filed: February 14, 2018
    Date of Patent: August 13, 2019
    Assignee: Skyworks Solutions, Inc.
    Inventor: Wade C. Allen
  • Patent number: 10374561
    Abstract: Provided is an amplification circuit that amplifies an input signal and outputs an amplified signal. The amplification circuit includes: an amplification element that outputs the amplified signal from an output terminal thereof; an inductor having one end to which a power supply voltage is supplied and another end that is connected to the output terminal of the amplification element; a variable resistor that is connected in parallel with the inductor; and a resistance value adjusting circuit that adjusts a resistance value of the variable resistor in accordance with the temperature.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: August 6, 2019
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Makoto Tabei, Daisuke Watanabe
  • Patent number: 10374557
    Abstract: A power amplifier apparatus, includes an envelope tracking (ET) current bias circuit configured to generate a first ET bias current by calculating a direct current DC, based on a reference voltage, and an ET current, based on an ET voltage, according to an envelope of an input signal; and a power amplifier circuit having a bipolar junction transistor supplied with the first ET bias current and a power voltage to amplify the input signal, wherein an average current of the first ET bias current is controlled to be substantially constant.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: August 6, 2019
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Byeong Hak Jo, Jong Ok Ha, Jeong Hoon Kim, Youn Suk Kim
  • Patent number: 10361662
    Abstract: Disclosed is a low noise amplifier including a current bleeding circuit. The low noise amplifier includes a common gate amplifier, a common source amplifier of which a gate is connected to a source of the common gate amplifier, a symmetric load connected to an output end of the common gate amplifier and an output end of the common source amplifier, and a current bleeding circuit of which one end is connected to the output end of the common source amplifier and another end is connected to the symmetric load, and including an active element and a load corresponding to the symmetric load.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: July 23, 2019
    Assignee: KNU-INDUSTRY COOPERATION FOUNDATION
    Inventor: Ku Duck Kwon
  • Patent number: 10361672
    Abstract: An audio reproduction apparatus is shown and includes an amplifier with a power amplification stage having transistors in a push-pull arrangement. A bias generator biases the transistors with a standing current. A processor receives a data stream comprising digital samples of an analog audio signal and analyzes the peak level of each group. It then determines the appropriate standing currents to maintain Class A operation of the power amplification stage given the peak levels of each of the groups. A digital to analog converter produces an analog input signal for the input stage of the amplifier from the data stream. A feedforward path between the processor and the bias generator allows the standing current to be adjusted prior to the arrival of the analog input signal in the power amplification stage.
    Type: Grant
    Filed: June 4, 2018
    Date of Patent: July 23, 2019
    Assignee: Entotem Limited
    Inventor: Andrew Paul George Randall
  • Patent number: 10355645
    Abstract: A power amplifier includes an amplifying circuit configured to amplify an input signal and comprising transistors, which may be disposed in parallel with one another and divided into a first group of transistors and a second group of transistors. The power amplifier also includes a bias circuit configured to supply bias power to one of the transistors of the first group and the transistors of the second group.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: July 16, 2019
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Hyeon Seok Hwang, Jong Soo Lee, Seung Chul Pyo
  • Patent number: 10348249
    Abstract: A method can be used to measure a load driven by a switching amplifier having a differential input, an LC output demodulator filter and a feedback network between the amplifier output and the differential input. The amplifier is AC driven in a differential and in a common mode by applying a common. The feedback network provides feedback towards the differential input from downstream the LC demodulator filter by computing the impedance of the load as a function of the differential mode output current and the common mode output current. The feedback network provides feedback towards the differential input from upstream the LC demodulator filter by measuring the impedance value of the inductor of the LC demodulator filter, and computing the impedance of the load as a function of the differential mode output current, the common mode output current and the impedance value of the inductor of the LC demodulator filter.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: July 9, 2019
    Assignee: STMicroelectronics S.r.l.
    Inventor: Giovanni Gonano
  • Patent number: 10348250
    Abstract: The noise power of an amplifier or buffer can increase towards the unity gain crossover frequency of the amplifier. The inventor realized that many applications do not require the full bandwidth capability of the amplifier all of the time and hence step could be taken to reduce the bandwidth at the output of the amplifier and hence the noise power can be reduced when appropriate, taking other operating requirements into consideration.
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: July 9, 2019
    Assignee: Analog Devices Global Unlimited Company
    Inventor: Dennis A. Dempsey
  • Patent number: 10348261
    Abstract: Disclosed is a differential transimpedance amplifier. The differential transimpedance amplifier includes a common gate amplifier configured to receive an electrical signal from an input node, and a common source amplifier configured to have a feedback resistor and receive the electrical signal form the input node, wherein an output signal of the common gate amplifier and an output signal of the common source amplifier form a differential signal pair.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: July 9, 2019
    Assignee: EWHA UNIVERSITY-INDUSTRY COLLABORATION FOUNDATION
    Inventor: Sung Min Park
  • Patent number: 10333471
    Abstract: A scalable periphery tunable matching power amplifier is presented. Varying power levels can be accommodated by selectively activating or deactivating unit cells of which the scalable periphery tunable matching power amplifier is comprised. Tunable matching allows individual unit cells to see a constant output impedance, reducing need for transforming a low impedance up to a system impedance and attendant power loss. The scalable periphery tunable matching power amplifier can also be tuned for different operating conditions such as different frequencies of operation or different modes.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: June 25, 2019
    Assignee: pSemi Corporation
    Inventors: Dan Willaim Nobbe, David Halchin, Jeffrey A. Dykstra, Michael P. Gaynor, David Kovac, Kelly Michael Mekechuk, Gary Frederick Kaatz, Chris Olson
  • Patent number: 10326414
    Abstract: Systems and methods are provided for dynamically biasing power amplifiers. A power amplifier (PA) that amplifies an input signal may be controlled based on processing of the input signal. The controlling may include adjusting biasing applied to the power amplifier (PA). The processing of the input signal may include applying clipping to the input signal and determining one or more parameters of the input signal. The biasing applied to the power amplifier (PA) may be adjusted based on the one or more parameters of the input signal. The clipping may be configured such that signals applied to positive and negative sides of the power amplifier (PA) are not differential.
    Type: Grant
    Filed: September 11, 2017
    Date of Patent: June 18, 2019
    Assignee: MAXLINEAR, INC.
    Inventors: Rahul Bhatia, Timothy Gallagher, Raja Pullela, Sridhar Ramesh
  • Patent number: 10326419
    Abstract: A power amplification circuit includes a first transistor, which includes a source coupled to a first power supply and receives an input signal at a gate of the first transistor, a capacitor, which includes a first terminal and a second terminal, the first terminal being coupled to a drain of the first transistor, and a transformer, which is coupled between the second terminal and the gate of the first transistor, transforms a first signal input from the second terminal, and outputs a second signal having a phase different from a phase of the first signal to the gate of the first transistor. The first transistor outputs an output signal from the drain of the first transistor.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: June 18, 2019
    Assignee: PANASONIC CORPORATION
    Inventor: Takayuki Abe
  • Patent number: 10326406
    Abstract: An amplifier device includes an amplifying unit, a bias module and an impedance unit. A first end of the amplifying unit electronically connects to a voltage source. A second end of the amplifying unit receives an input signal. The first end of the amplifying unit outputs an output signal amplified by the amplifying unit. A third end of the amplifying unit connects to a first reference potential. The bias module electrically connects to the second end of the amplifying unit for providing a bias voltage to the amplifying unit. An impedance unit is electrically connects to the bias module. An impedance value of the impedance unit is variable. The bias module adjusts the amplifier's linearity according to a frequency value of the input signal, a voltage value of the voltage source or a temperature value of the amplifier device. The impedance is adjusted according to the above-mentioned values.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: June 18, 2019
    Assignee: RichWave Technology Corp.
    Inventors: Chih-Sheng Chen, Hong-Jia Lo
  • Patent number: 10320341
    Abstract: An amplifier for a receiver circuit is disclosed. The amplifier has an input node (Vin) and an output node (Vout). It comprises a tunable tank circuit connected to the output node (Vout), a feedback circuit path connected between the output node (Vout) and the input node (Vin), and a tunable capacitor connected between an internal node of the feedback circuit path and a reference-voltage node. A receiver circuit and a communication apparatus is disclosed as well.
    Type: Grant
    Filed: May 2, 2016
    Date of Patent: June 11, 2019
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (publ)
    Inventor: Fenghao Mu
  • Patent number: 10320343
    Abstract: An audio amplifier includes an output stage including a first toroidal transformer with a first pair of secondary windings that are coupled in parallel across an output terminal. The output stage further includes a second toroidal transformer with a second pair of secondary windings that are connected in a series combination that is coupled across the output terminal.
    Type: Grant
    Filed: March 8, 2018
    Date of Patent: June 11, 2019
    Assignee: REAL ANALOG, LLC
    Inventor: Rudolph J. Liedtke
  • Patent number: 10320338
    Abstract: A differential amplifier comprises a first differential circuitry structure including a first part comprising at least one branch of transistors and a second part comprising at least one branch of transistors, and a second circuitry structure. The second circuitry structure has a first non-linear device and a second non-linear device. The non-linear devices each comprise a transistor having a control node connected to a differential output terminals of the differential amplifier. A common center node of the non-linear devices is connected to a control node of one of the transistors of each branch of the first part having a differential output terminal. Amplifier applications, communication devices and network nodes are also disclosed.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: June 11, 2019
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Henrik Sjöland, Mohammed Abdulaziz, Waqas Ahmad
  • Patent number: 10320342
    Abstract: A bi-directional RF signal amplifier includes a RF input port and surge suppression circuitry downstream of the RF input port. First and second communications paths lead from the surge suppression circuitry to first and second RF output ports. The second communications path is considered non-interruptible and can support both downstream and upstream RF communications even in the absence of power being supplied to the RF signal amplifier. The surge suppression circuitry includes a data line connected to the RF input port. A first circuit path is electrically connected between the data line and ground. A gas discharge tube (GDT), within the first circuit path, acts as an open circuit when a voltage across the GDT is less than a predetermined value and acts as a short circuit when the voltage across the GDT exceeds the predetermined voltage. An electronic device is placed in series with the GDT within the first circuit path.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: June 11, 2019
    Assignee: CommScope, Inc. of North Carolina
    Inventor: Shi Man Li