Slew-Rate Enhancement Circuit of CLASS AB Operational Transconductance Amplifier (OTA) by Auxiliary Circuit

Abstract

This paper introduces a slew-rate enhancement (SRE) circuit for CLASS AB Operational Transconductance Amplifier (OTA). The enhancement is achieved by two auxiliary amplifiers. Simulation results show that CLASS AB OTA with the proposed SRE circuit is achieved 60. 25MV/s positive and 30. 6MV/s symmetric slew rate with a load capacitance of2pF. The positive and negative slew rate of the CLASS AB OTA with the proposed SRE circuit have increased by a factor of 7.03 and 3.23 respectively. The SRE circuit only work during fast signal transitions with the power consumption increased by 8.06%.