Patents by Inventor Kelvin Wen

Kelvin Wen 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).

  • Input clamping structure for sound quality improvement in car-radio class-AB power amplifier design
    Patent number: 9331644
    Abstract: A clamping circuit for a class AB amplifier includes a reference voltage circuit, four NPN Darlington transistors having inputs coupled to the reference voltage circuit, and outputs for providing four clamped voltages and a split NPN Darlington transistor having an input coupled to the reference voltage circuit, and four separate outputs for providing four AC ground voltages.
    Type: Grant
    Filed: January 19, 2015
    Date of Patent: May 3, 2016
    Assignee: STMICROELECTRONICS (SHENZHEN) R&D CO. LTD.
    Inventors: Mei Yang, YueHua Wang, Xaut Zhang, Kelvin Wen, XiangSheng Li
  • INPUT CLAMPING STRUCTURE FOR SOUND QUALITY IMPROVEMENT IN CAR-RADIO CLASS-AB POWER AMPLIFIER DESIGN
    Publication number: 20150137888
    Abstract: A clamping circuit for a class AB amplifier includes a reference voltage circuit, four NPN Darlington transistors having inputs coupled to the reference voltage circuit, and outputs for providing four clamped voltages and a split NPN Darlington transistor having an input coupled to the reference voltage circuit, and four separate outputs for providing four AC ground voltages.
    Type: Application
    Filed: January 19, 2015
    Publication date: May 21, 2015
    Inventors: Mei YANG, YueHua WANG, Xaut ZHANG, Kelvin WEN, XiangSheng LI
  • Input clamping structure for sound quality improvement in car-radio class-AB power amplifier design
    Patent number: 8970280
    Abstract: A clamping circuit for a class AB amplifier includes a reference voltage circuit, four NPN Darlington transistors having inputs coupled to the reference voltage circuit, and outputs for providing four clamped voltages, and a split NPN Darlington transistor having an input coupled to the reference voltage circuit, and four separate outputs for providing four AC ground voltages.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: March 3, 2015
    Assignee: STMicroelectronics (Shenzhen) R&D Co. Ltd.
    Inventors: Mei Yang, YueHua Wang, Xaut Zhang, Kelvin Wen, XiangSheng Li