Design of high-performance transconductance error amplifier for DC-DC converter

摘要

A high-performance transconductance error amplifier is presented for DC-DC converters. The amplifier designed in this paper is composed of OVA (Operational Voltage Amplifier) and OFA (Operational Floating Amplifier). The OVA is designed as cascode structure and provides a high voltage gain, while the OFA is designed to enhance the transconductance and improve driving capability of the error amplifier. The performance of the error amplifier presented is improved effectively. Using SMIC 0.35μm CMOS process technology to stimulate the designed circuits, the results show that the transconductance error amplifier achieved an open loop voltage gain of 57 dB and a transconductance of 191μS.