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:
Aug. 14, 1984
Filed:
Sep. 27, 1982
Applicant:
Inventor:
John G Hogeboom, Nepean, CA;
Assignee:
Northern Telecom Limited, Montreal, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ;
U.S. Cl.
CPC ...
331111 ; 331143 ; 3311 / ; 331D / ;
Abstract
An oscillator including an amplifier which is formed by CMOS inverters and has a positive feedback path from an output to an input of the amplifier. The positive feedback path includes a capacitor which is alternately charged and discharged by switched constant current devices controlled by the amplifier and connected to the amplifier input. The amplifier includes a second capacitor in a negative feedback path to limit voltage swings at the amplifier input. The constant charging and discharging currents can be produced by current mirrors which are controlled to control the oscillation frequency.