Patent ID: 7236063

Claim:
A wide band modulation PLL, comprising: a PLL part, including: a voltage controlled oscillator; a frequency divider that divides a frequency of an output signal of the voltage controlled oscillator; a phase comparator that outputs a signal based on a phase difference between a reference signal and the output signal of the frequency divider; and a loop filter that outputs an output to the voltage controlled oscillator so as to average the output of the phase comparator; a first modulation input part that inputs a first modulation signal to the voltage controlled oscillator based on inputted modulation data for modulating; and a second modulation input part that inputs a second modulation signal to a position different from the voltage controlled oscillator in the PLL part based on the modulation data, wherein the voltage controlled oscillator includes a first control terminal to which the first modulation signal is inputted and a second control terminal to which a signal based on the second modulation signal is inputted; and wherein the first modulation input part has a modulation sensitivity calculation unit that calculates a first modulation sensitivity in the first control terminal and a modulation factor adjustment unit that adjusts a modulation factor of the modulation data based on the calculated first modulation sensitivity and outputs the first modulation signal.