Patent ID: 7844304

Claim:
A power supply for a communications device, comprising: a controllable regulator that varies power drawn from a power input according to communications requirements of the communications device, the controllable regulator increasing power drawn from the power input immediately before an increase of power is required by the communications device when a magnitude of a first rate of change of required power exceeds a predetermined level in response to a first control signal from a controller, wherein the controllable regulator is configured to gradually increase the power drawn from the power input after receipt of the first signal from the controller such that a second rate of change of power drawn from the power input in response to the first control signal is lower than the first rate of change of power required by the communications device; and an active filter, connected to an output of the controllable regulator, the active filter controlled to variably divert power that is output from the controllable regulator in excess of what is required by the communications device in response to a second control signal from the controller, wherein electromagnetic emissions resulting from the rate of change of power are reduced, wherein the active filter comprises power storage components that store power diverted to the active filter, wherein the active filter is controlled to release stored power to the power supply output to assist in fulfilling transmission requirements of the radio.