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. 13, 2004
Filed:
Jul. 22, 2002
Xijian Lin, Fremont, CA (US);
Elantec Semiconductor, Inc., Milpitas, CA (US);
Abstract
An improved relaxation oscillator circuit is provided using conventional CMOS device shunted with a current source ( and ) at each load of two cross-coupled gain stages. The improved oscillator uses a clamp voltage reference ( ), to control the voltage swing across the charging/discharging capacitor ( ). The improvements provide improved speed to power ratio, increased frequency tuning range, and less process and temperature variation effects. A transistor ( ) and current source ( ) replicate output transistors ( ) and current sources ( ). An amplifier ( ) receives a clamp voltage reference ( ) and current from the transistor ( ) and current source ( ) and functions to provide necessary drive currents to the gates of transistors ( ) which drive the outputs (VOR, VOL).