Patent ID: 8289009

Claim:
An apparatus comprising: at least one filter configured to filter a reference voltage to generate a filtered reference voltage; an amplifier configured to amplify a difference between the filtered reference voltage and a feedback voltage to generate a drive signal; a first transistor configured to generate an output voltage based on the drive signal, the feedback voltage based on the output voltage; a second transistor configured to generate a first bias current for the amplifier based on the drive signal; a voltage-to-current converter configured to generate a second bias current for the amplifier based on the reference voltage and the feedback voltage; and a bias current source configured to generate a third bias current for the amplifier received in a third input of the amplifier that is not one of a differential pair of inputs, wherein the amplifier is configured to receive a total bias current comprising a combination of the first, second, and third bias currents in the third input of the amplifier that that is not one of a differential pair of inputs of the amplifier.