A high-performance CMOS modified amplifier

Abstract

A new operational transconductance amplifier (OTA) based on the conventional triple folded cascode (TFC) structure is presented. Using the proposed positive feedback method, the dc-gain of the amplifier enhanced significantly. The simulation results for the designed OTA in a typical 0.35μm CMOS technology show more than 20dB dc-gain enhancement while bandwidth, output voltage swing range, and the phase margin characteristics are not affected to a great extent. Higher linearity in the higher output voltage swings is the main advantages of the proposed approach in comparison to the previously reported positive feedback methods.