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:
Jun. 04, 1991
Filed:
Jul. 16, 1990
Applicant:
Inventors:
Wayne P Shepherd, Sunrise, FL (US);
Darrell E Davis, Sunrise, FL (US);
Wan F Tay, Coral Springs, FL (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03C / ; H03L / ;
U.S. Cl.
CPC ...
332128 ; 331 / ; 331 16 ; 331 25 ; 455112 ; 455119 ;
Abstract
A synthesizer circuit with spur compensation utilizes fractional division in the synthesizer loop. The fractional divider includes means for compensating the spurs when the fractional numerator N=0. The synthesizer includes means for selecting a reference divisor R such that a non zero value of fractional numerator is produced and such that the generated spurs fall below the side band noise limits of the synthesizer's voltage controlled oscillator.