Patents by Inventor QICHAO SHAO

QICHAO SHAO 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).

  • Amplifier with common mode detection
    Patent number: 11012044
    Abstract: An analog discrete current mode negative feedback amplifier circuit for use with a micro-fused strain gauge is disclosed. The amplifier circuit includes a Wheatstone bridge coupled to a first power supply and a second power supply. The first power supply and the second power supply can be configured such that the periodically alternate between two voltage levels. The Wheatstone bridge can be coupled to a negative feedback amplifier circuit with common mode detection. The amplifier circuit can comprise a differential amplifier with a negative feedback configuration coupled to a common mode amplifier. In addition, the output of each of the amplifiers can be coupled to a common-mode amplifier. In a pressure sensing application, the output of the common mode amplifier serves to output the temperature while the differential amplifiers serve to output the pressure.
    Type: Grant
    Filed: September 19, 2018
    Date of Patent: May 18, 2021
    Assignee: SENSATA TECHNOLOGIES, INC.
    Inventors: Srinivasan Venkatraman, William J. Walsh, Kousuke Nakamura, Qichao Shao
  • AMPLIFIER WITH COMMON MODE DETECTION
    Publication number: 20200091884
    Abstract: An analog discrete current mode negative feedback amplifier circuit for use with a micro-fused strain gauge is disclosed. The amplifier circuit includes a Wheatstone bridge coupled to a first power supply and a second power supply. The first power supply and the second power supply can be configured such that the periodically alternate between two voltage levels. The Wheatstone bridge can be coupled to a negative feedback amplifier circuit with common mode detection. The amplifier circuit can comprise a differential amplifier with a negative feedback configuration coupled to a common mode amplifier. In addition, the output of each of the amplifiers can be coupled to a common-mode amplifier. In a pressure sensing application, the output of the common mode amplifier serves to output the temperature while the differential amplifiers serve to output the pressure.
    Type: Application
    Filed: September 19, 2018
    Publication date: March 19, 2020
    Inventors: SRINIVASAN VENKATRAMAN, WILLIAM J. WALSH, KOUSUKE NAKAMURA, QICHAO SHAO