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. 11, 1989
Filed:
Aug. 17, 1987
Applicant:
Inventors:
Earl T Cohen, Berkeley, CA (US);
John A Swensen, Berkeley, CA (US);
Assignee:
Cyclotomics, Inc., Berkeley, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
328155 ; 331 / ; 307511 ;
Abstract
A digital phase lock loop includes a variable precision modular counter which adjusts the output phase by changing the counter modulus by an amount proportional to the current modulus of the counter to preserve the effectiveness of each such change over a wide range of moduli, thereby increasing the effective bandwidth of the digital phase lock loop. The digital phase lock loop is characterized by an exponential duty cycle phase adjustment which avoids spurious oscillations due to either overdamping or resonance, thus increasing loop stability.