Low power 0.4 V operational common mode feed forward transconductance amplifier
by Pratik Deshmukh; Madan Mali; Vrushali G. Raut
International Journal of Circuits and Architecture Design (IJCAD), Vol. 1, No. 3, 2014

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.

Online publication date: Wed, 08-Apr-2015

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