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. 19, 1994
Filed:
Jul. 16, 1992
Applicant:
Inventors:
Dennis R Worden, Pleasanton, CA (US);
Michael A Brown, San Jose, CA (US);
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L / ;
U.S. Cl.
CPC ...
331 / ; 331-8 ; 331 11 ; 331 14 ; 331 16 ;
Abstract
An autoranging phase-lock-loop circuit compares an oscillator signal output from a range programmable voltage controlled oscillator, which generates the oscillator frequency within one of a plurality of operating ranges, to a reference signal and commands the voltage controlled oscillator to step to a next operating range if the voltage controlled oscillator cannot lock onto the reference signal within a prescribed time.