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:
Feb. 10, 1987
Filed:
Sep. 27, 1985
Applicant:
Inventor:
Stephen W Hobrecht, Los Altos, CA (US);
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
331111 ; 331143 ;
Abstract
An IC oscillator is disclosed using a small capacitor to determine the fundamental frequency. The capacitor is small enough to permit an on chip capacitor to be used. The capacitor is charged and discharged at the same rate between voltage limits established in the circuit. A single voltage controlled current source controls the charge and discharge currents equally so as to provide a relative low voltage-controlled frequency. The circuit can operate at very low charging currents so that a wide range of control is available. The circuit is configured to produce a very low radiation level.