| 摘要 |
PROBLEM TO BE SOLVED: To provide PLL circuit and a frequency-dividing method which allow reduction of spurious noise level, containing in a generating output using a simple configuration. SOLUTION: This PLL circuit performs fractional dividing containing a phase comparator 20 outputting a phase difference signal, in correspondence with phase difference by comparing phases of two signals, a charge pump 21 generating in correspondence with phase difference signals ϕSP, ϕSR, and a low-pass filter 11 and a voltage control generator 12, and which is provided with a control circuit 23, a delay circuit 22 and a selection circuit 24 for modulating the phase difference signal supplied to the charge pump 21. |
