Semiconductor device and pll circuit

A semiconductor device comprising a phase locked loop circuit, wherein the phase locked loop circuit comprises:

• a proportional path provided in a first power supply system and configured to output an analog proportional signal according to a detection signal, the detection signal indicating a phase difference between a reference signal and a signal obtained by feeding back an output signal of the phase locked loop circuit;
• an integral path provided in a second power supply system and configured to output an analog integral signal according to the detection signal, a voltage of the second power supply system being lower than that of the first power supply system;
• a current-controlled oscillator driver provided in the first power supply system and configured to output control current according to the analog proportional signal from the proportional path and the analog integral signal from the integral path;
• a current-controlled oscillator provided in the second power supply system and configured to output an output signal generated by performing an oscillation operation according to the control current;
• and
• a phase frequency detector provided in the second power supply system and configured to detect a phase difference between the reference signal and the signal obtained by feeding back the output signal and then output a result of the detection as the detection signal.