Power supply noise insensitive charge pump, loop filter, VCO control, and VCO
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United States of America Patent
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Jun 2, 2009
Grant Date -
Aug 30, 2007
app pub date -
Feb 23, 2006
filing date -
Feb 23, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An oscillating circuit includes a charge pump, a loop filter and a voltage controlled oscillator. The charge pump and the loop filter generates a differential voltage signal. The loop filter is responsive to the differential voltage signal and generates a filtered differential voltage control signal that is proportional to the differential voltage signal. The voltage controlled oscillator is responsive to the filtered differential voltage control signal and generates a periodic signal that has a frequency that corresponds to the filtered differential voltage control signal.
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