METHOD AND APPARATUS FOR CONTROLLING A VOLTAGE CONTROLLED OSCILLATOR
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United States of America Patent
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Nov 30, 2004
Grant Date -
Dec 16, 2004
app pub date -
May 30, 2003
filing date -
May 30, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A level detector (110, 104) and corresponding method detects (602) whether an output signal level of a VCO (102) is within a window bounded by minimum and maximum thresholds. When the output signal level is not within the window, a loop-control element (108) closes (604) an AGC loop of the VCO and controls the gain of the VCO with a gain-control signal that tracks an AGC bias signal. When the output signal level is within the window, the loop-control element opens (606) the AGC loop and controls the gain with a fixed bias signal derived from the AGC bias signal at the time the AGC loop is opened.
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