CHARGE PUMP AND ASSOCIATED PHASE-LOCKED LOOP AND CLOCK AND DATA RECOVERY

摘要

A charge pump (120, 220, 300, 800) includes a current source circuit (302, 802), a current sink circuit (304, 804) and a switch circuit. The switch circuit is coupled between the current source circuit (302, 802) and the current sink circuit (304, 804), and is arranged for generating a first current (Ir) at a first output terminal (N1) and generating a second current (Ic) at a second output terminal (N2) according to a first control signal (UP) and a second control signal (DN), wherein each of the first current (Ir) and the second current (Ic) is generated from the current source circuit (302, 802).