| 摘要 |
PROBLEM TO BE SOLVED: To reduce a VCO (Voltage Controlled Oscillator) phase noise caused by variance of a constant current, and stabilize the output of the VCO. SOLUTION: A semiconductor integrated circuit device 300 includes: a voltage control oscillator 301 which controls a bias current or an oscillation frequency, and outputs an output signal; a phase synchronization circuit 302 which outputs a frequency control signal based on the output signal output by the voltage controlled oscillator 301; a peak position detection circuit 303 which detects a peak position of the frequency control signal output from the phase synchronization circuit 302; and a bias control circuit 304 which generates a bias current based on the peak position detected by the peak position detection circuit 303, and outputs the bias current. The voltage controlled oscillator 301 controls the bias current or the oscillation frequency which is output from the bias control circuit 304, and outputs the output signal based on the frequency control signal output by the phase synchronization circuit 302. COPYRIGHT: (C)2009,JPO&INPIT
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