Title: A 1.2V improved operational amplifier for bio-medical applications

Authors: M. Santhanalakshmi; P.T. Vanathi

Addresses: Department of ECE, PSG College of Technology, Coimbatore, India ' Department of ECE, PSG College of Technology, Coimbatore, India

Abstract: In this paper, an improved low-power Complementary Metal Oxide Semiconductor (CMOS) programmable operational amplifier for bio-medical applications is presented. The op-amp includes a rail-to-rail input stage, folded cascode stage with class AB biasing and a constant Gm stage. The op-amp is programmed to operate in low-power mode and low noise mode. Simulation results show that the circuit attains a dc open loop gain of 97.75 dB and Common Mode Rejection Ratio (CMRR) of 112.41 dB under a 22 kΩ and 13.5 pF load. The op-amp is realised in 130 nm CMOS technology using Synopsis tool.

Keywords: operational amplifiers; biomedical applications; low power; low noise; CMOS op amps; simulation; programmable op amps.

DOI: 10.1504/IJBET.2012.049218

International Journal of Biomedical Engineering and Technology, 2012 Vol.9 No.4, pp.337 - 350

Published online: 12 Dec 2014 *

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