A 21nW CMOS Operational Amplifier for Biomedical Application

In this paper, CMOS operational amplifier using a two stage has been enunciated for low power device application by using it in subthreshold region. The proposed op-amp shows high gain as well as moderate UGB using capacitor compensation technique circuit. It is operated on rail to rail power supply of ±500 mV. This amplifier is highly useful for biomedical application due to low power consumption. The designed operational amplifier gain is 48 dB, bandwidth is 29 kHz, phase margin is 61°, and slew rate is 50.6 V/µS with 21 nW power consumption. This circuit is designed and simulated in cadence analog and digital system design tools of UMC 90 nm CMOS technology.

[1]  Phillip E Allen,et al.  CMOS Analog Circuit Design , 1987 .

[2]  Jun Hu,et al.  A low voltage CMOS rail-to-rail operational amplifier based on flipped differential pairs , 2011, 2011 4th IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications.

[3]  Mohamad Sawan,et al.  A low-power 900 mV rail-to-rail class-AB operational amplifier , 2003, CCECE 2003 - Canadian Conference on Electrical and Computer Engineering. Toward a Caring and Humane Technology (Cat. No.03CH37436).

[4]  Horst Zimmermann,et al.  A 1GHz-GBW operational amplifier for DVB-H receivers in 65nm CMOS , 2009, 2009 12th International Symposium on Design and Diagnostics of Electronic Circuits & Systems.

[5]  Hae-Seung Lee,et al.  A CMOS op amp with fully-differential gain-enhancement , 1994 .

[6]  T. K. Bhattacharyya,et al.  A power efficient and constant-gm 1.8 V CMOS operational transconductance amplifier with rail-to-rail input and output ranges for charge pump in phase-locked loop , 2012, 2012 International Conference on Devices, Circuits and Systems (ICDCS).