Patents by Inventor Benny T. Ma

Benny T. Ma 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).

  • CMOS driver circuit having reduced switching noise
    Patent number: 5241221
    Abstract: In a driver circuit, high- and low-impedance drive means (26 and 28 respectively) operate in parallel to effect a desired output transition. Adaptive control means 32 respond to a threshold value of the output signal (VO) and turn off the low-impedance drive means in the course of the output transition. The low initial output impedance of the driver circuit effects rapid charging of a line capacitance CL, while toward the end of the output transition the higher output impedance of the driver circuit more closely matches the input impedance ZL of a load circuit. This higher impedance dampens ringing and thereby reduces induced supply line noise which is conventionally associated with high-speed driver circuits.
    Type: Grant
    Filed: November 16, 1992
    Date of Patent: August 31, 1993
    Assignee: North American Philips Corp., Signetics Div.
    Inventors: Thomas D. Fletcher, Edward A. Burton, Benny T. Ma