Communication semiconductor integrated circuit with...

Details Communication semiconductor integrated circuit with... Communication semiconductor integrated circuit with...

2006-03-14

2006-03-14

Nguyen, Minh (Department: 2816)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C332S127000

Reexamination Certificate

active

07012470

ABSTRACT:
The present invention provides a communication semiconductor integrated circuit wherein a first control voltage for a voltage-controlled oscillator circuit is controlled based on a feedback signal sent from a PLL loop to generate a carrier frequency signal used as a carrier, and under the generation of the carrier frequency signal, a second control voltage for the voltage-controlled oscillator circuit is controlled based on the output of a DA converter circuit for DA-converting a code generated based on transmit data to thereby frequency-modulate an oscillation signal. The communication semiconductor integrated circuit is provided with a frequency adjustment/control circuit which measures the frequency of an oscillation output of the voltage-controlled oscillator circuit and adjusts a reference current value of the DA converter circuit according to the difference between the measured value and a target value to thereby correct the frequency.

REFERENCES:
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patent: 5834987 (1998-11-01), Dent
patent: 5983077 (1999-11-01), Dent
patent: 6515553 (2003-02-01), Filiol et al.
patent: 6774740 (2004-08-01), Groe
patent: 7-46123 (1995-02-01), None

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