Semiconductor device, radio communication terminal, and method for controlling semiconductor device

摘要

A semiconductor device according to the present invention includes a PLL circuit, in which the PLL circuit includes: a phase difference detection unit that detects a phase difference between a reference signal and a division signal; a filter that outputs a control signal according to a detection result of the phase difference detection unit; an oscillation unit that outputs an oscillation signal of a frequency according to the control signal; a division unit that divides the oscillation signal to output it as the division signal; a noise intensity detection unit that detects a noise intensity of a predetermined frequency component included in the control signal; and a phase difference adjustment unit that adjusts a phase difference between the reference signal and the division signal based on the noise intensity detected by the noise intensity detection unit.

主权项

1. A semiconductor device comprising a PLL circuit,
wherein the PLL circuit includes: (a) a phase difference detection unit that detects a phase difference between a reference signal and a division signal; (b) a filter that outputs a control signal according to a detection result of the phase difference detection unit; (c) an oscillation unit that outputs an oscillation signal of a frequency according to the control signal; (d) a division unit that divides the oscillation signal to output it as the division signal; (e) a noise intensity detection unit that detects a noise intensity of a predetermined frequency component included in the control signal; and (f) a phase difference adjustment unit that adjusts a phase difference between the reference signal and the division signal based on the noise intensity detected by the noise intensity detection unit.