Patent ID: 8854023

Claim:
An apparatus for regulating an output voltage, the apparatus comprising: a low dropout regulator comprising a pass element and an amplifier, wherein the low dropout regulator is operable to regulate the output voltage based on a feedback signal and a feedforward signal; and an auxiliary low dropout regulator comprising an auxiliary pass element and an auxiliary amplifier, wherein the auxiliary dropout regulator is operable to generate the feedforward signal, and wherein the auxiliary amplifier is substantially matched with the amplifier, wherein the amplifier comprises a multi-input amplifier, wherein the multi-input amplifier is operable to combine the feedback signal and the feedforward signal, wherein the feedback signal is connected to a first non-inverting input of the multi-input amplifier, wherein the feedforward signal is connected to a second non-inverting input of the multi-input amplifier, and wherein a DC reference voltage input is connected to an inverting input of the multi-input amplifier, wherein the DC reference voltage input is also connected to a second inverting input of the multi-input amplifier, wherein the auxiliary amplifier comprises an auxiliary multi-input amplifier, wherein the DC reference voltage input is connected to an inverting input of the auxiliary multi-input amplifier and to a non-inverting input of the auxiliary multi-input amplifier, and wherein the feedforward signal is connected to a second non-inverting input of the auxiliary multi-input amplifier.