Compensation for oscillator tuning gain variations in frequency synthesizers
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United States of America Patent
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Apr 20, 2004
Grant Date -
Dec 18, 2003
app pub date -
Jun 14, 2002
filing date -
Jun 14, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A system is provided for compensating for tuning gain variations in a phase lock loop. Compensation is performed by a calibration system that estimates the tuning gain of the oscillator and then adjusts the charge pump current value by a ratio of the nominal tuning gain to the measured tun gain. The tuning gain measurement is performed by measuring the change in the voltage controlled oscillator's tuning control voltage when the phase lock loop is locked to two different frequencies, which are separated by a fixed, predetermined amount. The two frequencies may be above or below the final output frequency of the VCO, or the second frequency may be the final frequency in order to reduce calibration time and settling time.
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