Patents by Inventor Xiaohu Fang

Xiaohu Fang 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).

  • Doherty power amplifier circuit
    Patent number: 11601095
    Abstract: A Doherty power amplifier circuit having a main power amplification device, an auxiliary power amplification device arranged in parallel with the main power amplification device, and a load modulation circuit comprising a harmonic injection circuit connected with respective outputs of the main power amplification device and the auxiliary power amplification device. The harmonic injection circuit is arranged to transfer harmonic components generated at the main power amplification device to the auxiliary power amplification device and harmonic components generated at the auxiliary power amplification device to the main power amplification device, when both the main and auxiliary power amplification devices are operating, for modulating the respective outputs of the main power amplification device and the auxiliary power amplification device.
    Type: Grant
    Filed: October 1, 2020
    Date of Patent: March 7, 2023
    Assignee: City University of Hong Kong
    Inventors: Wingshing Chan, Xinyu Zhou, Shaoyong Zheng, Xiaohu Fang, Derek Ho
  • DOHERTY POWER AMPLIFIER CIRCUIT
    Publication number: 20210021238
    Abstract: A Doherty power amplifier circuit having a main power amplification device, an auxiliary power amplification device arranged in parallel with the main power amplification device, and a load modulation circuit comprising a harmonic injection circuit connected with respective outputs of the main power amplification device and the auxiliary power amplification device. The harmonic injection circuit is arranged to transfer harmonic components generated at the main power amplification device to the auxiliary power amplification device and harmonic components generated at the auxiliary power amplification device to the main power amplification device, when both o the main and auxiliary power amplification devices are operating, for modulating the respective outputs of the main power amplification device and the auxiliary power amplification device.
    Type: Application
    Filed: October 1, 2020
    Publication date: January 21, 2021
    Inventors: Wingshing Chan, Xinyu Zhou, Shaoyong Zheng, Xiaohu Fang, Derek Ho
  • Doherty power amplifier circuit
    Patent number: 10833634
    Abstract: A Doherty power amplifier circuit having a main power amplification device, an auxiliary power amplification device arranged in parallel with the main power amplification device, and a load modulation circuit comprising a harmonic injection circuit connected with respective outputs of the main power amplification device and the auxiliary power amplification device. The harmonic injection circuit is arranged to transfer harmonic components generated at the main power amplification device to the auxiliary power amplification device and harmonic components generated at the auxiliary power amplification device to the main power amplification device, when both the main and auxiliary power amplification devices are operating, for modulating the respective outputs of the main power amplification device and the auxiliary power amplification device.
    Type: Grant
    Filed: April 4, 2018
    Date of Patent: November 10, 2020
    Assignee: City University of Hong Kong
    Inventors: Wingshing Chan, Xinyu Zhou, Shaoyong Zheng, Xiaohu Fang, Derek Ho
  • DOHERTY POWER AMPLIFIER CIRCUIT
    Publication number: 20190312552
    Abstract: A Doherty power amplifier circuit having a main power amplification device, an auxiliary power amplification device arranged in parallel with the main power amplification device, and a load modulation circuit comprising a harmonic injection circuit connected with respective outputs of the main power amplification device and the auxiliary power amplification device. The harmonic injection circuit is arranged to transfer harmonic components generated at the main power amplification device to the auxiliary power amplification device and harmonic components generated at the auxiliary power amplification device to the main power amplification device, when both the main and auxiliary power amplification devices are operating, for modulating the respective outputs of the main power amplification device and the auxiliary power amplification device.
    Type: Application
    Filed: April 4, 2018
    Publication date: October 10, 2019
    Inventors: Wingshing Chan, Xinyu Zhou, Shaoyong Zheng, Xiaohu Fang, Derek Ho