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:
Jul. 18, 1989
Filed:
Apr. 15, 1987
Applicant:
Inventor:
Roger D Thornton, St. Marys, OH (US);
Assignee:
Westinghouse Electric Corp., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ; H03D / ;
U.S. Cl.
CPC ...
328133 ; 328155 ; 375120 ; 307262 ;
Abstract
A phase detecting circuit for use in phase-locked loops is provided with a pair of bistable circuits such as type D flip-flops. One of the circuits is clocked by a reference input signal and reset by the Q output of the other circuit. The other circuit is clocked by a second data signal and reset by the NOT Q output of the first circuit. The average value of the voltage appearing on the NOT Q output of the first circuit is proportional to the phase difference between the reference data signal and the second data signal.