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:
Jan. 16, 1996
Filed:
Jan. 25, 1994
John E Gersbach, Burlington, VT (US);
Masayuki Hayashi, Williston, VT (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A ring oscillator circuit which provides an output signal having a substantially constant, fifty (50%) percent duty cycle. The circuit includes a plurality of cascaded inverting stages, each of which has an input circuit for detecting an output voltage of a preceding inverting stage. One inverting stage provides a voltage to an output node. A clamping circuit, coupled to the output node, provides current to the output node whenever the instantaneous voltage output at the output node departs from a threshold voltage of a subsequent logic circuit. The current is such as to clamp the average voltage output to the threshold voltage. The plurality of cascaded inverting stages is coupled to power supply voltage across capacitor configured transistors. The ring oscillator circuit can be employed within a voltage controlled oscillator.