Method and apparatus for controlling a voltage controlled oscillator
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United States of America Patent
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Nov 2, 2004
Grant Date -
Oct 28, 2004
app pub date -
Apr 22, 2003
filing date -
Apr 22, 2003
priority date (Note) -
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Abstract
A rectifier (306) rectifies (402) an output signal of a VCO (302) to produce an envelope signal proportional to an amplitude of the output signal. An integrator (308) integrates (404) the envelope signal to produce a comparison signal, such that, in response to a change in the envelope signal, during a first mode of operation of the VCO, the comparison signal is allowed to change at a first rate, and, during a second mode of operation of the VCO, the comparison signal is allowed to change at a second rate different from the first rate. A comparator (310) compares (406) the comparison signal with a reference signal (316) to produce a bias signal, and controls (408) a gain of the VCO with the bias signal.
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