CMOS relaxation oscillator circuit with improved speed and reduced process temperature variations
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United States of America Patent
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-
Apr 13, 2004
Grant Date -
Jun 19, 2003
app pub date -
Jul 22, 2002
filing date -
Dec 14, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved relaxation oscillator circuit is provided using conventional CMOS device shunted with a current source (101 and 103) at each load of two cross-coupled gain stages. The improved oscillator uses a clamp voltage reference (134), to control the voltage swing across the charging/discharging capacitor (118). The improvements provide improved speed to power ratio, increased frequency tuning range, and less process and temperature variation effects. A transistor (130) and current source (138) replicate output transistors (110, 114) and current sources (101, 103). An amplifier (132) receives a clamp voltage reference (134) and current from the transistor (130) and current source (138) and functions to provide necessary drive currents to the gates of transistors (110, 114) which drive the outputs (VOR, VOL).
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