Dennis Ting Lo

US Patent:

59492643, Sep 7, 1999

Filed:

Nov 29, 1996

Appl. No.:

8/758529

Inventors:

Dennis C. Lo - Foster City CA

International Classification:

H03L 7089

US Classification:

327157

Abstract:

A digital phase detector and charge pump circuit system reset circuit and method resets a digital phase detector according to the charge outputs between the charge pump circuits and a following loop filter. The sensing circuitry emulates portions of the circuitry of the digital phase detector and charge pump circuit system and minimizes deadband time. Current mirror portions of the charge pump circuit alternate between p-channel and n-channel devices to regularize output voltage levels produced by the charge pump circuit system.