Charge pump circuit and pll circuit using the same

Abstract

A charge pump circuit (), and a PLL circuit using the charge pump circuit, has a glitch compensation circuit () to compensate for a slow glitch which occurs along charging/discharging of electric charges in a parasitic capacitance. The glitch compensation circuit () includes a comparator (), a latch circuit (), a capacitor (C) and transistors (Q, Q) serving as a charge/discharge device. The comparator () compares potentials and applies a logic output signal to the latch circuit (), and the latch circuit () in response to output of the comparator, instructs the charge/discharge device to perform a charge or discharge operation to charge or discharge the capacitor so as to allow a potential at a second output terminal to come close to a potential at a first output terminal or a potential at a designated node in a loop filter of the PLL circuit.