| 摘要 |
A phase locked circuit includes a locked loop circuit having a phase comparator, a voltage controlled oscillator, and a variable frequency divider which divides a clock signal f<SUB>vco </SUB>output from the voltage controlled oscillator by n and outputs it. Additionally, the phase locked circuit includes a band pass filter part which is coupled to an output side of the voltage controlled oscillator via a switching part. A frequency division ratio setting signal to be input into the variable frequency divider is input as a switching signal into the switching part so as to switch a frequency of the clock signal f<SUB>vco </SUB>output from the voltage controlled oscillator. As synchronizing with switching of the frequency, the switching part switches a plurality of band pass filters provided to the band pass filter part and couples to the voltage controlled oscillator.
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