Patent ID: 7683711

Claim:
A voltage regulator having a source signal input at which a first signal containing alternating current (AC) noise is providable and an output, the voltage regulator comprising: an analog amplifier having a first input, a second input, and a control input, the first input of the analog amplifier coupled to the voltage regulator output and the second input of the analog amplifier coupled to the source signal input of the voltage regulator; a noise filter having an input coupled to the source signal input of the voltage regulator and an output coupled to the control input of the analog amplifier, the input of the noise filter coupled to receive the first signal containing AC noise, the noise filter substantially filtering the AC noise and producing a second signal at its output; and a signal compensator disposed between the output of the noise filter and the control input of the analog amplifier, the signal compensator having an input coupled to receive the second signal and an output coupled to the analog amplifier, the signal compensator for regulating the second signal to generate a third signal the third signal being substantially noise-free, the third signal provided to the control input of the analog amplifier as a biasing voltage, wherein the first signal is amplified by the analog amplifier based on amplification characteristics of the analog amplifier, which are determined by the biasing voltage.