Patents by Inventor Lap W. Chow

Lap W. Chow 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).

  • Sample and hold circuit
    Patent number: 6323696
    Abstract: A sample and hold circuit that is coupled to a control voltage source and a signal source has a sampling bridge coupled in series between a first resonant tunneling diode. The bridge comprises a plurality of diodes. The sampling bridge couples an input voltage signal that is to be sampled to a holding capacitor when the sampling bridge is forward biased. The bridge substantially decouples the input voltage signal from the holding capacitor when the sampling bridge diodes are reversed biased. The resonant tunneling diodes when reversed biased allow the bridge to be isolated from the control voltage source to allow the holding capacitor to float at the sampled value of the input voltage.
    Type: Grant
    Filed: December 7, 1999
    Date of Patent: November 27, 2001
    Assignee: Hughes Electronics Corporation
    Inventors: Ronald M. Hickling, Joel N. Schulman, David H. Chow, Lap W. Chow, Hector J. De Los Santos