A CLASS AB Operational Transconductance Amplifier (OTA) with a Slew Rate Enhancement (SRE) Auxiliary Circuit

This paper proposes a CLASS AB Operational Transconductance Amplifier (OTA) incorporating an auxiliary circuit for slew rate enhancement (SRE). The presented OTA consists of four essential components: a reference current source, a SRE auxiliary circuit, a folded cascode input stage and a class AB output stage. Under the conditions of 30 V power supply voltage and 10 pF capacitive load, the operational transconductance am-plifier incorporate SRE significantly enhances the slew rate to 140 MV/s and 143 MV/s separately, resulting in a remarkable improvement by factors of 70 and 89.37 respectively compared to previous performance. Additionally, this advancement is achieved with only a slight increase in supply current, specifically by just 7.69%.