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. 25, 1989
Filed:
Mar. 18, 1988
Applicant:
Inventors:
John N Wells, St. Albans, GB;
Neil E Thomas, St. Albans, GB;
Assignee:
Marconi Instruments Limited, Longacres, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ;
U.S. Cl.
CPC ...
328133 ; 328109 ; 307514 ; 307262 ; 307479 ;
Abstract
A phase comparator accepts two streams of digital pulses, one being a reference signal and the other a test signal, and generates an output signal indicative of the phase difference. The phase comparator can be implemented as a four-state device or higher, and thus exhibits a wide phase capture range, i.e. multiples of 360.degree., and can provide a stable, predictable and linear output signal when the two input signals are in lock. It is therefore very suitable for use in a phase locked loop in which temporary wide variations in phase can occur.