| 摘要 |
A voltage controlled oscillator includes: a voltage controlled oscillation circuit (1), an oscillation frequency thereof being controlled by a control voltage signal; a PLL circuit (2) that generates a control voltage signal to be input to the voltage controlled oscillation circuit (1); a multiplier circuit (3) that multiplies an oscillation signal output from the voltage controlled oscillation circuit (1); and a band-pass filter and trap circuit (4) that sets a pass band for passing a signal with a predetermined multiplication number of multiplication signals output from the multiplier circuit (3) and a trap frequency equal to the frequency of the oscillation signal input to the multiplier circuit (3), and varies the pass band and the trap frequency in synchronization with the control voltage signal.
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