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:
May. 10, 1988
Filed:
Aug. 25, 1986
Applicant:
Inventors:
Tim D Isbell, San Jose, CA (US);
Walter R Davis, Sunnyvale, CA (US);
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03B / ; H03F / ;
U.S. Cl.
CPC ...
307498 ; 307529 ; 307494 ; 307357 ; 330260 ;
Abstract
A circuit for pulse width modulating the output of a voltage controlled oscillator without introducing any ocillator frequency or amplitude (slope) modulation. A summing circuit is combined with a comparator and provided with inputs that accommodate differential sum/difference inputs, an error input and a ramp input from the oscillator or other source. The ramp and error signals are combined differentially to pulse width modulate the comparator output and pulse width modulation can also be achieved by via the sum/difference inputs a differential relationship.