Charge pump circuit, e.g. for digital phase locked loop, has output stage, voltage follower stage, changeover input coupled to output stage for changing between charge pumping, voltage following modes

摘要

The charge pump circuit has at least one control signal input (3), a signal output (6) for outputting an electrical charge quantity depending on the control signal, an output stage with at least one transistor (21), a voltage follower stage coupled to the output stage and a changeover input (41) for changing between a charge pumping mode and a voltage following mode coupled to the output stage.