VCO WITH LOW POWER, HIGH SPEED AND LOW JITTER
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United States of America Patent
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Issued Date -
Sep 3, 2015
app pub date -
Feb 28, 2014
filing date -
Feb 28, 2014
priority date (Note) -
Abandoned
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Importance
Abstract
A VCO circuit having low jitter and low PSS (power supply sensitivity). The VCO circuit includes a first ring oscillator stage, a second ring oscillator stage coupled to the first ring oscillator stage, and a VCO input coupled to both the first ring oscillator stage and the second ring oscillator stage for receiving a control voltage. Each of the first ring oscillator stage and the second ring oscillator stage further includes a CMOS inverter with a plurality of cross coupled transistors to implement oscillation of the VCO circuit, wherein each of the first ring oscillator stage and the second ring oscillator stage comprises a unity gain amplifier.
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