A Low Power CMOS Operational Transconductance Amplifier with Improved CMRR

Abstract

This work proposes a new low power Operational Transconductance Amplifier (OTA) topology. The rejection to common-mode signals is achieved by adding parallel transistors to input MOS transistors in order to increase the Common Mode Rejection Ratio (CMRR). It achieves a gain of 87.34 dB at 9.65 μW power consumption. The article presents a comparison to other OTA topologies. The proposed OTA was designed for the IBM 0.13 μm CMOS technology.