VCO GAIN TRACKING FOR MODULATION GAIN SETTING CALIBRATION

WIPO Patent Application WO2004042924

A3

Voltage controlled oscillator (VCO) gain tracking is used for programming modulation gain settings to minimize modulation distortion in a low bandwidth phase locked loop of a mobile station (10). A synthesizer (20) generates a tuning voltage (Vt) for controlling a frequency of a voltage controlled oscillator (VCO) modulated radio frequency signal. A controller (22) outputs a modulation data signal and includes an analog to digital converter (72) for receiving the tuning voltage from the synthesizer (20) on a VCO feedback loop (70), a gain control lookup table (LUT) (76) for storing modulation gain setting calibration data for respective mobile station sub-bands, and a gain setting digital to analog converter (DAC) (78) for outputting a modulation gain control signal to the synthesizer (20). The modulation gain setting calibration data is calibrated using a one-time or continuous calibration methodology during, respectively, a background or normal mode of mobile station operation.

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BLACK GREGORY
SCHWARTZ DANIEL B
TRAYLOR KEVIN

PCT/US2003/035172

July 15, 2004

October 31, 2003

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MOTOROLA INC (US)

H01Q3/26; H01Q11/12; H03C3/09; H03L7/197; H04B1/04; H04B1/06; H04B1/18; H04B7/00; H03L; (IPC1-7): H04B1/18

US5983077A	1999-11-09
US6441690B1	2002-08-27
US6549078B1	2003-04-15

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