| 摘要 |
In case of switching a frequency of an output signal of a voltage control oscillator, an arithmetic unit outputs to a variable frequency divider such a frequency divisor that the voltage control oscillator outputs a signal having a predetermined frequency ranging between frequencies before and after switching and thereafter the frequency divisor to be output to the variable frequency divider is changed to such a frequency divisor that the voltage control oscillator outputs a signal having the frequency after switching when the frequency of the output signal from the voltage control oscillator detected by a counter and a register reaches a frequency previously stored in a memory circuit.
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