High speed, power supply independent CMOS voltage controlled ring oscillator with level shifting circuit
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United States of America Patent
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Dec 29, 1992
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N/A
app pub date -
Feb 28, 1992
filing date -
Feb 28, 1992
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Abstract
A high speed voltage controlled oscillator (VCO) providing for low sensitivity to the noise on the integrated circuit's (IC) power supply. The VCO circuit creates a supply voltage for a ring oscillator independent of the IC's power supply thereby controlling the frequency of operation independent of variations on the IC's power supply. A high speed CMOS level shifting circuit provides for converting outputs of the VCO with low logic level and varying frequencies to a signal with a full CMOS logic level and low duty cycle distortion.
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