Frequency modulator using PLL

Details Frequency modulator using PLL Frequency modulator using PLL

2007-02-15

2010-02-23

Kinkead, Arnold (Department: 2817)

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

C332S117000, C381S003000, C381S004000, C381S016000, C375S376000, C455S260000

Reexamination Certificate

active

07667553

ABSTRACT:
In a frequency modulator, a VCO oscillates at a frequency according to a voltage applied to an input terminal. A divider divides an output signal of the VCO. A phase comparator compares the output of the divider with a reference clock signal and outputs a voltage corresponding to a phase difference. A loop filter is provided on a path leading from an output terminal of the phase comparator to the input terminal of the VCO, and the loop filter removes a high-frequency component of an output voltage of the phase comparator. A terminal for inputting a modulation signal is provided in the loop filter, separately from a terminal connected with the path leading from the output terminal of the phase comparator to the input terminal of the VCO.

REFERENCES:
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Japanese Office Action for Japanese Patent Application No. 2006-038090 mailed Jul. 7, 2009 with English translation.

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