Patents by Inventor Vincent Wing Sing Tso

Vincent Wing Sing Tso 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).

  • Loop filter capacitor multiplication in a charge pump circuit
    Patent number: 6744292
    Abstract: A charge pump circuit with a small loop filter capacitor is disclosed in the invention. This is accomplished by providing multiple currents which add to the desired current, I. A switching circuit switches one of the currents through the capacitor, while directing a combination of the multiple currents through the resistors. In this way, a smaller current is provided through the capacitor, allowing the capacitor to be much smaller in size.
    Type: Grant
    Filed: October 25, 2002
    Date of Patent: June 1, 2004
    Assignee: Exar Corporation
    Inventors: Shin Chung Chen, Vincent Wing Sing Tso
  • LOOP FILTER CAPACITOR MULTIPLICATION IN A CHARGE PUMP CIRCUIT
    Publication number: 20040080359
    Abstract: A charge pump circuit with a small loop filter capacitor is disclosed in the invention. This is accomplished by providing multiple currents which add to the desired current, I. A switching circuit switches one of the currents through the capacitor, while directing a combination of the multiple currents through the resistors. In this way, a smaller current is provided through the capacitor, allowing the capacitor to be much smaller in size.
    Type: Application
    Filed: October 25, 2002
    Publication date: April 29, 2004
    Applicant: Exar Corporation
    Inventors: Shin Chung Chen, Vincent Wing Sing Tso
  • Programmable highly temperature and supply independent oscillator
    Patent number: 6157270
    Abstract: An oscillator circuit generates an output frequency that is substantially independent of power supply and temperature variations. The oscillator circuit can be implemented using conventional complementary metal-oxide-semiconductor technology. The oscillator circuit is suitable for use as an internal oscillator for generating a stable reference frequency in telecommunication receiver modules.
    Type: Grant
    Filed: December 28, 1998
    Date of Patent: December 5, 2000
    Assignee: Exar Corporation
    Inventor: Vincent Wing Sing Tso