PLL CIRCUIT, AND RADIO COMMUNICATION DEVICE EQUIPPED THEREWITH

摘要

In an ADPLL circuit 100, on the basis of a gain of a digitally controlled oscillator 10 estimated when a loop gain of a certain value is set in the loop filter 18 and on the basis of a device parameter of the digitally controlled oscillator 10, the DCO gain. estimation unit 20 estimates a gain of the digitally controlled oscillator 10 when a loop gain of another value is set in the loop filter 18,