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:
Jan. 27, 1988
Applicant:
Inventors:
Assignee:
U.S. Philips Corp., New York, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
329111 ; 307514 ; 328140 ; 329145 ;
Abstract
A circuit arrangement for detecting whether the frequency of an input signal exceeds a predetermined frequency swing. The arrangement includes a detector circuit which supplies an error-indication signal if the phase shift between the input signal and a second signal, which second signal tracks the frequency of the input signal, exceeds limit values corresponding to such frequency swing. A delay circuit derives the second signal from the input signal by delaying the input signal a predetermined delay time which increases with the frequency of the input signal.