BROADBAND MODULATION PLL, AND MODULATION FACTOR ADJUSTING METHOD THEREFOR

WIPO Patent Application WO/2005/020428

A1

A broadband modulation PLL having an excellent modulation accuracy is provided at a low cost. A PLL part includes a VCO (21), a frequency divider (22), a phase comparator (23) and a loop filter (24). A frequency division ratio producing part (29) is used to adjust the frequency division ratio of the frequency divider (22), while a control signal producing part (30) is used to adjust the controlled voltage of the VCO (21). The VCO (21) has two control terminals, one of which receives a control signal from the control signal producing part (30). During a modulation factor adjustment, a calibration data (f_c1) is inputted to the frequency division ratio producing part (29), while a calibration data (f_c2) is inputted to the control signal producing part (30). A demodulator (31) demodulates an output signal from the VCO (21) when those respective calibration data are inputted. A modulation factor adjusting means (32) outputs, based on the modulated signal, a modulation factor adjustment signal to the control signal producing part (30).

HIRANO SHUNSUKE
OCHI TAKETOSHI

PCT/JP2004/010679

March 03, 2005

July 21, 2004

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MATSUSHITA ELECTRIC IND CO LTD (JP)
HIRANO SHUNSUKE
OCHI TAKETOSHI

H03C3/00; H03C3/09; H03L7/099; H03L7/18; H03L7/197; (IPC1-7): H03C3/00; H03L7/18

JPH1168719A	1999-03-09
US6211747B1	2001-04-03
JPH114201A	1999-01-06
JP2000307666A	2000-11-02

Oguri, Shohei (ARK Mori Building 12-32 Akasaka 1-chom, Minato-ku Tokyo 13, JP)

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