A system and method is disclosed for providing efficient closed loop feedback control in an adaptive voltage scaling system. The closed loop feedback circuitry of the invention comprises variable feedback gain for an error amplifier circuit. In one embodiment the variable feedback gain comprises a low value of feedback gain and a high value of feedback gain. The value of feedback gain that is employed determines the speed of response of the system (1) to performance level changes of an adjustable supply voltage, and (2) to disturbances such as temperature changes, IR voltage drops, and ripple voltages. The variable feedback gain feature enables the use of adaptive voltage scaling regulators that have outputs with relatively high ripple voltage.