Patent ID: 7397226

Claim:
An integrated circuit voltage regulator, comprising: a filter including: a capacitive element; and a resistive element, including: a resistive transistor including: a source; a drain; and a well; and a second transistor, wherein a length of the resistive transistor is substantially greater than a width of the resistive transistor, and wherein a width of the second transistor is substantially greater than a length of the second transistor; a reference amplifier having at least an input and an output, wherein the input of the reference amplifier is arranged to receive a constant voltage reference, and wherein the output of the reference amplifier is coupled to the source and the well of the resistive transistor of the filter; an error amplifier having at least an input and an output, wherein the input of the error amplifier is coupled to the filter, and wherein the source and the drain of the resistive transistor of the filter are arranged to provide a resistive channel between the reference amplifier and the error amplifier; and a pass transistor that is coupled to an input node and to the output of the error amplifier.