Patent ID: 8330511

Claim:
An apparatus comprising: a current mirror circuit including a first leg and a second leg, wherein a first current flowing through the first leg from a charge pump output node to a ground node is mirrored to a second current flowing through the second leg to the ground node, wherein the current minor circuit is adapted to initiate the first current flowing through the first leg in response to a transition of a charge pump input signal, wherein a gate of a mirror transistor of the second leg is coupled to a bias node and to a gate of a mirror transistor of the first leg, and wherein there is a first coupling effect between the transition of the charge pump input signal and a voltage on the bias node; and a replica circuit that is substantially structurally identical to the first leg, wherein the replica circuit is adapted to receive an inverted version of the charge pump input signal and reduce a voltage disturbance on the bias node by inducing a second coupling effect between a transition of the inverted version of the charge pump input signal and the voltage on the bias node, and wherein the first coupling effect and the second coupling effect have opposite magnitudes.