Patents by Inventor Tianzuo Xi

Tianzuo Xi 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).

  • Load-line switching for push-pull power amplifiers
    Patent number: 11671061
    Abstract: An amplifier system including a push-pull power amplifier having an input to receive a radio frequency (RF) input signal and an output, the push-pull power amplifier being configured to amplify the RF input signal and provide at the output an RF output signal that is an amplified version of the RF input signal, a switchable shunt capacitance switchably connected between a load-line connected to the output of the push-pull power amplifier and a reference potential, and a switch configured to selectively connect the switchable shunt capacitance to the reference potential and disconnect the switchable shunt capacitance from the reference potential to vary an impedance of load-line.
    Type: Grant
    Filed: September 25, 2019
    Date of Patent: June 6, 2023
    Assignee: SKYWORKS SOLUTIONS, INC.
    Inventors: Netsanet Gebeyehu, Tianzuo Xi, Sukchan Kang, Nan Ni
  • LOAD-LINE SWITCHING FOR PUSH-PULL POWER AMPLIFIERS
    Publication number: 20200099348
    Abstract: An amplifier system including a push-pull power amplifier having an input to receive a radio frequency (RF) input signal and an output, the push-pull power amplifier being configured to amplify the RF input signal and provide at the output an RF output signal that is an amplified version of the RF input signal, a switchable shunt capacitance switchably connected between a load-line connected to the output of the push-pull power amplifier and a reference potential, and a switch configured to selectively connect the switchable shunt capacitance to the reference potential and disconnect the switchable shunt capacitance from the reference potential to vary an impedance of load-line.
    Type: Application
    Filed: September 25, 2019
    Publication date: March 26, 2020
    Inventors: Netsanet Gebeyehu, Tianzuo Xi, Sukchan Kang, Nan Ni
  • Systems and methods providing a matching circuit that bypasses a parasitic impedance
    Patent number: 10491172
    Abstract: A circuit including a radio frequency (RF) amplifier including a transistor configured to receive an RF signal at its control terminal, a capacitor coupled to a first terminal of the transistor, an inductor coupled to a second terminal of the transistor, wherein the capacitor and inductor form a loop from the first terminal to the second terminal, wherein the loop bypasses a parasitic inductance between the second terminal and ground.
    Type: Grant
    Filed: November 11, 2016
    Date of Patent: November 26, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Tianzuo Xi, Haichuan Kang, ZhenQi Chen, Zhenying Luo, Xiangdong Zhang, Xinwei Wang, Yanjie Sun, Yan Kit Gary Hau, Jing-Hwa Chen
  • Systems and Methods Providing a Matching Circuit that Bypasses a Parasitic Impedance
    Publication number: 20180048270
    Abstract: A circuit including a radio frequency (RF) amplifier including a transistor configured to receive an RF signal at its control terminal, a capacitor coupled to a first terminal of the transistor, an inductor coupled to a second terminal of the transistor, wherein the capacitor and inductor form a loop from the first terminal to the second terminal, wherein the loop bypasses a parasitic inductance between the second terminal and ground.
    Type: Application
    Filed: November 11, 2016
    Publication date: February 15, 2018
    Inventors: Tianzuo Xi, Haichuan Kang, ZhenQi Chen, Zhenying Luo, Xiangdong Zhang, Xinwei Wang, Yanjie Sun, Yan Kit Gary Hau, Jing-Hwa Chen
  • Non-linear capacitance based parametric mixer
    Patent number: 9455753
    Abstract: A method and apparatus for frequency conversion. The apparatus includes a mixer configured to provide an output signal with a converted frequency, a local oscillator, and a non-linear transmission structure operably connected to the mixer and the local oscillator. The non-linear transmission structure is configured to cancel at least a portion of non-linearity of the mixer from the output signal and to modify a gain of the output signal. The local oscillator may provide a local oscillator signal to the non-linear transmission structure. The non-linear transmission structure may also be configured to modify the local oscillator signal to cancel at least the portion of the non-linearity of the mixer and to modify the gain of the output signal, and provide the modified local oscillator signal to the mixer.
    Type: Grant
    Filed: April 2, 2015
    Date of Patent: September 27, 2016
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Tianzuo Xi, Daquan Huang
  • Non-Linear Capacitance Based Parametric Mixer
    Publication number: 20150326257
    Abstract: A method and apparatus for frequency conversion. The apparatus includes a mixer configured to provide an output signal with a converted frequency, a local oscillator, and a non-linear transmission structure operably connected to the mixer and the local oscillator. The non-linear transmission structure is configured to cancel at least a portion of non-linearity of the mixer from the output signal and to modify a gain of the output signal. The local oscillator may provide a local oscillator signal to the non-linear transmission structure. The non-linear transmission structure may also be configured to modify the local oscillator signal to cancel at least the portion of the non-linearity of the mixer and to modify the gain of the output signal, and provide the modified local oscillator signal to the mixer.
    Type: Application
    Filed: April 2, 2015
    Publication date: November 12, 2015
    Inventors: Tianzuo Xi, Daquan Huang