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

EasyChair Preprint 10752

Abstract

This paper introduces a CLASS AB Operational Transconductance Amplifier(OTA) with a slew-rate enhancement (SRE) auxiliary circuit through 0.18um BCD process. The presented OTA is composed of four parts:  folded cascode input stage, class AB output stage, SRE auxiliary circuit, reference current source. The proposed OTA achieving the DC gain of 134 dB, unity gain bandwidth of 3.69 MHz under the conditions of 30V power supply voltage and 10pF capacitive load. The simulation results show that the CLASS AB OTA with the proposed SRE auxiliary circuit achieves the positive slew-rate of 140 MV/s and the negative slew-rate of 143 MV/s with a load capacitance of 10pF,which has been increased to a factor of 70 and 89.37 times respectively, while the supply current only increased 7.69%.

Keyphrases: Operational Transconductance Amplifier(OTA), class AB, slew-rate enhancement(SRE) auxiliary circuit

@booklet{EasyChair:10752,
  author    = {Peipei Li and Li Luo and Qi Wei},
  title     = {A CLASS AB Operational Transconductance Amplifier (OTA) with a Slew-Rate Enhancement (SRE) Auxiliary Circuit},
  howpublished = {EasyChair Preprint 10752},
  year      = {EasyChair, 2023}}