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:
Apr. 07, 1981
Filed:
Jul. 16, 1979
Robert N Allgood, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An MOS oscillator is provided which has reduced sensitivity to power supply voltage variations and to threshold processing variations. A plurality of field effect transistors are connected in series to provide reference voltages to establish two trip points for a comparator. A second input of the comparator is connected to a capacitor whose charging and discharging is controlled by the output of the comparator. The plurality of series connected transistors form unsymmetrical active device dividers. The unsymmetrical configuration is chosen such that power supply variations and threshold variations cancel much of the charge current variation due to these variations. Matched current sources are used throughout the oscillator circuit.