Method and apparatus for providing a start-up control voltage
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United States of America Patent
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Jun 18, 2002
Grant Date -
N/A
app pub date -
Jun 27, 2000
filing date -
Jun 27, 2000
priority date (Note) -
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Importance
Abstract
A startup control voltage preset method and apparatus to reduce phase locked loop lock acquisition time at startup. In one embodiment, the disclosed apparatus includes a phase locked loop circuit including a startup circuit that is activated at startup. The startup circuit is coupled to force a control input of a voltage control oscillator of the phase lock loop circuit across a loop filter to a voltage at or near a target nominal operating voltage. In one embodiment, the target nominal operating voltage corresponds to a target operating frequency of the phase locked loop circuit. In one embodiment, the startup circuit is coupled to be activated for a predetermined time at startup. In one embodiment, the startup circuit is coupled to be activated at startup until the control input voltage of the voltage controlled oscillator is at or near a reference voltage.
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