Ring voltage controlled oscillator (VCO) startup helper circuit
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United States of America Patent
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Sep 7, 2021
Grant Date -
Mar 4, 2021
app pub date -
Mar 31, 2020
filing date -
Aug 28, 2019
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Abstract
A ring voltage controlled oscillator (VCO) circuit is herein provided. According to one embodiment, a ring VCO circuit includes a plurality of stages connected in series, wherein each stage includes a first inverter, a second inverter, a third inverter and a fourth inverter, the first inverter connected in parallel with the third and fourth inverters and the second inverter connected in parallel with the third and fourth inverters, and a first biasing resistor connected to a first node and coupled to an input of the first inverter. The first biasing resistor includes a first switch configured to set the first biasing resistor to about zero voltage.
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