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:
Dec. 22, 1992
Filed:
Sep. 16, 1991
Applicant:
Inventors:
Corey D Petersen, Pleasanton, CA (US);
Paul S Cheung, Woodbridge, CA (US);
Assignee:
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Primary Examiner:
Int. Cl.
CPC ...
H03L / ;
U.S. Cl.
CPC ...
331 / ; 331 17 ; 331 25 ; 375120 ;
Abstract
A constant loop gain phase lock loop for recovering a clock from non-uniformly spaced data pulses utilizes a programmable current source and charge pump whereby the current into the charge pump is proportional to the number of VCO clock periods between data pulses. As the time between pulses increases the current charging the pump increases and when the time between pulses decreases the current charging the pump decreases to maintain a constant loop gain independent of the data pattern.