Patents by Inventor Cheng-chung Shih

Cheng-chung Shih 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).

  • Ratio independent cyclic A/D and D/A conversion using a reciprocating reference approach
    Patent number: 4622536
    Abstract: An algorithmic analog-to-digital and digital-to-analog converter 10 combines the techniques of switched capacitor cyclic conversion by using first and second amplifiers 31, 32 with capacitors C.sub.1, C.sub.1 ', C.sub.2, C.sub.2 ', C.sub.3, C.sub.3 ', C.sub.4, C.sub.4 ', C.sub.5, C.sub.5 ' communicating with the inputs of said amplifiers 31, 32 and between the inputs and outputs of said amplifiers 31, 32, and the techniques of reference voltage refreshing. The performance of the converter 10 is capacitor ratio-independent. Because of the ratio-independent aspect, very small component values can be used, and as a result, the die area required for the circuitry can be quite small.
    Type: Grant
    Filed: September 28, 1984
    Date of Patent: November 11, 1986
    Assignee: Regents of the University of California
    Inventors: Cheng-Chung Shih, Paul R. Gray