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:
Apr. 19, 1983
Filed:
Jan. 19, 1981
Applicant:
Inventors:
Michael J Underhill, Horsham, GB;
Nigel J Walters, Horsham, GB;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03L / ;
U.S. Cl.
CPC ...
331 / ; 331 16 ; 331 25 ; 307271 ;
Abstract
In a phase lock loop frequency synthesizer, a successive addition rate multiplier provides a correction signal for eliminating ripple in a frequency control signal applied to a variable frequency oscillator which produces the output frequency of the synthesizer. Ripple elimination is improved by means of a feedback loop by which any residual ripple is detected and the correction signal is automatically adjusted.