Phase-locked loop start up circuit
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United States of America Patent
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Aug 18, 2015
Grant Date -
Sep 15, 2011
app pub date -
Mar 9, 2010
filing date -
Mar 9, 2010
priority date (Note) -
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Abstract
A phase-locked loop (PLL) circuit includes a voltage-controlled oscillator (VCO) having a VCO input for receiving a control voltage and a VCO output, a feedback loop between the VCO input and the VCO output, and a start-up circuit having a start-up circuit input and a start-up circuit output. The start-up circuit output is coupled to the VCO input and the start-up circuit input is coupled to the VCO output. The start-up circuit provides a voltage at its start-up circuit output during a start-up phase, which terminates after a predetermined number of feedback pulses are detected by the start-up circuit.
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