Patents by Inventor Horng-Der Chang

Horng-Der Chang 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).

  • Phase-locked loop having adjustable delay elements
    Patent number: 6160456
    Abstract: A phase-locked loop which achieves the effect of frequency expansion is disclosed. An adjustable delay element is incorporated in a conventional phase-locked loop in order that one of the output clock signals of a divided-by-N counter and a divided-by-M counter leads (lags behind) the other. This in turn causes a phase frequency detector to alternately generate `up` and `dn` signals, thereby frequency expansion is achieved.
    Type: Grant
    Filed: June 14, 1999
    Date of Patent: December 12, 2000
    Assignee: REALTEK Semiconductor Corp.
    Inventor: Horng-Der Chang