Patent ID: 7573252

Claim:
A circuit for providing controlled ramping and filtering, comprising: a voltage regulator controller, including: a current mirror circuit that is arranged to receive a reference voltage and to provide a charging current from a biasing current, wherein the current mirror circuit includes a first and a second transistor having sources receiving said reference voltage; a soft-start capacitor circuit that is arranged to provide a conditioned reference voltage based, in part, on the charging current, wherein the soft-start capacitor circuit is coupled to the second transistor, and wherein the soft-start capacitor circuit is arranged such that the conditioned reference voltage is substantially stable during a steady state and such that the conditioned reference voltage substantially tracks the reference voltage during the steady state; a switch circuit comprising a transistor, wherein the switch circuit is arranged to receive a switch control signal, and wherein the switch circuit is arranged to shunt the charging current away from the soft-start capacitor circuit, if the switch control signal corresponds to an inactive level, and further arranged to enable the soft-start capacitor circuit to be charged, if the switch control signal corresponds to an active level; and a differential amplifier that is arranged to receive a feedback voltage that is based at least, in part, on a regulated output voltage; to receive the conditioned reference voltage; and to, during all operating states, compare the conditioned reference voltage with the feedback voltage.