Patents by Inventor Guoqing FU

Guoqing FU has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Radio frequency (RF) amplifier bias circuit
    Patent number: 11509269
    Abstract: An amplifier circuit includes an amplifier configured to receive a radio frequency (RF) input signal from an input node, a bias circuit comprising a reference transistor coupled between a reference current source and ground, and a bias transistor coupled to the reference transistor and configured to generate a main bias current to bias the amplifier, an input power sense circuit coupled to the input node, and an additional transistor coupled to the input power sense circuit and to the bias transistor, the additional transistor configured to generate an additional bias current to bias the amplifier, the additional bias current responsive to a power level of the RF input signal.
    Type: Grant
    Filed: August 17, 2020
    Date of Patent: November 22, 2022
    Assignee: QUALCOMM Incorporated
    Inventors: Jisun Ryu, Yan Kit Gary Hau, Guoqing Fu, Xinwei Wang, Xiangdong Zhang, Chenliang Du
  • Stability improvement circuit for radio frequency (RF) power amplifiers
    Patent number: 11323079
    Abstract: Certain aspects of the present disclosure are directed to an amplifier. The amplifier may include a transistor coupled to an output of the amplifier, and a resonator coupled between the output of the amplifier and a reference potential node, a resonant frequency of the resonator being set to be at a subharmonic of a fundamental frequency of the amplifier, and an impedance of the resonator being greater than a load impedance of the amplifier at the fundamental frequency of the amplifier.
    Type: Grant
    Filed: February 28, 2020
    Date of Patent: May 3, 2022
    Assignee: QUALCOMM Incorporated
    Inventors: Jing-Hwa Chen, Junzhi Yu, Yan Kit Gary Hau, Guoqing Fu, Xinwei Wang, Xiangdong Zhang
  • RADIO FREQUENCY (RF) AMPLIFIER BIAS CIRCUIT
    Publication number: 20220052656
    Abstract: An amplifier circuit includes an amplifier configured to receive a radio frequency (RF) input signal from an input node, a bias circuit comprising a reference transistor coupled between a reference current source and ground, and a bias transistor coupled to the reference transistor and configured to generate a main bias current to bias the amplifier, an input power sense circuit coupled to the input node, and an additional transistor coupled to the input power sense circuit and to the bias transistor, the additional transistor configured to generate an additional bias current to bias the amplifier, the additional bias current responsive to a power level of the RF input signal.
    Type: Application
    Filed: August 17, 2020
    Publication date: February 17, 2022
    Inventors: Jisun RYU, Yan Kit Gary HAU, Guoqing FU, Xinwei WANG, Xiangdong ZHANG, Chenliang DU
  • STABILITY IMPROVEMENT CIRCUIT FOR RADIO FREQUENCY (RF) POWER AMPLIFIERS
    Publication number: 20210273615
    Abstract: Certain aspects of the present disclosure are directed to an amplifier. The amplifier may include a transistor coupled to an output of the amplifier, and a resonator coupled between the output of the amplifier and a reference potential node, a resonant frequency of the resonator being set to be at a subharmonic of a fundamental frequency of the amplifier, and an impedance of the resonator being greater than a load impedance of the amplifier at the fundamental frequency of the amplifier.
    Type: Application
    Filed: February 28, 2020
    Publication date: September 2, 2021
    Inventors: Jing-Hwa CHEN, Junzhi YU, Yan Kit Gary HAU, Guoqing FU, Xinwei WANG, Xiangdong ZHANG