Voltage controlled oscillator runaway prevention
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United States of America Patent
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Jul 12, 2016
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N/A
app pub date -
Jan 11, 2016
filing date -
Jan 11, 2016
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Abstract
A feedback module for preventing voltage controlled oscillator (VCO) runaway in a phase locked loop (PLL) circuit can include a first, a second, and a third input to receive a first output signal from a PLL circuit, a reference signal, and a first control signal. The feedback module may also include a feedback circuit to generate a second control signal, the second control signal being coupled to an input of the PLL circuit, wherein the feedback circuit generates the second control signal by comparing a number of cycles of the first output signal to a first threshold, and a number of cycles of the reference signal to a second threshold.
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