Title: Low power 0.4 V operational common mode feed forward transconductance amplifier

Authors: Pratik Deshmukh; Madan Mali; Vrushali G. Raut

Addresses: Department of Electronics and Telecommunication, Sinhgad College of Engineering, S. No. 44/1, Vadgaon (Bk), Off. Sinhgad Road, Pune 411 041, Maharashtra, India ' Department of Electronics and Telecommunication, Sinhgad College of Engineering, S. No. 44/1, Vadgaon (Bk), Off. Sinhgad Road, Pune 411 041, Maharashtra, India ' Department of Electronics and Telecommunication, Sinhgad College of Engineering, S. No. 44/1, Vadgaon (Bk), Off. Sinhgad Road, Pune 411 041, Maharashtra, India

Abstract: This paper presents operational transconductance amplifier, designed in area effective 90 nm tech node. Implementation of an amplifier having transistors operation in sub-threshold region is a very crucial task. In this design, complementary input pairs are used to achieve rail to rail input operation. To achieve enhanced slew-rate of 0.055 V/µs with sub-threshold operation, the adaptive biasing circuitry is used. Class AB output stage is used to provide good performance of 44 dB with ultralow ~4 µW power consumption. And all the transistors in the circuitry are biased in sub-threshold region to operate circuit at very low supply voltage of 0.4V. To increase CMRR of an operational transconductance amplifier, a common mode feed forward circuit is used, with keeping DC gain almost constant. Layout designed for proposed circuit requires very less area of 38.05 µm ∼ 33.8 µm on die.

Keywords: adaptive bias; class AB output; common mode feed forward; CMFF circuits; low power; low voltage; winner-take-all; WTA; operational transconductance amplifiers; OTA; power consumption; layout design; circuit design.

DOI: 10.1504/IJCAD.2014.068299

International Journal of Circuits and Architecture Design, 2014 Vol.1 No.3, pp.258 - 268

Received: 06 Jan 2014
Accepted: 03 Jun 2014
Published online: 08 Apr 2015 *

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