The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 08, 1998
Filed:
Aug. 22, 1996
Applicant:
Inventor:
John Eric Ruetz, San Bruno, CA (US);
Assignee:
IC Works, Inc., San Jose, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03L / ;
U.S. Cl.
CPC ...
327159 ; 327 48 ; 327 49 ; 327161 ; 327163 ; 331 / ; 331 25 ;
Abstract
A phase frequency detection circuit and method in a phase lock loop circuit uses delay circuits to limit the period of expression of up and down signals which adjust the output frequency of a voltage controlled oscillator. The pulse frequency detection circuit includes cross-linked latches to drive logic gates which produce output signals for adjusting the output frequency of a voltage controlled oscillator and delay circuitry connected to the outputs of particular logic gates for selective nullification of up and down control signals to a voltage controlled oscillator.