Patent ID: 6630866
Filing Date: 2003-10-07
Classification: H03F

Abstract:
An operational amplifier output stage, comprising:a pre-driver sub-stage and a final sub-stage, the pre-driver sub-stage having a plurality of transistors being biased by a plurality of current sources, the pre-driver sub-stage being adapted to accept a current signal (&dgr;Iin) from an input gm cell; the pre-driver stage being further adapted to provide biasing to a plurality of transistors in the final sub-stage; and the pre-driver sub-stage being coupled to the final sub-stage so as to provide current gain from input to output of &dgr;Io&ap;&bgr;n*&bgr;p*&dgr;Iin; and localized feedback circuitry enclosed in the output stage operable to correct signal errors more rapidly than an overall amplifier feedback loop, thereby improving the speed characteristics of the operational amplification output stage.