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A 63‐dB gain OTA operating in subthreshold with 20‐nW power consumption
Author(s) -
Akbari Meysam,
Hashemipour Omid
Publication year - 2017
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.2248
Subject(s) - operational transconductance amplifier , transconductance , subthreshold conduction , amplifier , frequency compensation , dissipation , electrical engineering , operational amplifier , electronic engineering , open loop gain , fully differential amplifier , cmos , voltage , engineering , computer science , physics , transistor , thermodynamics
Summary This paper presents a two‐stage bulk‐driven operational transconductance amplifier operating in weak‐inversion region. The proposed amplifier is upgraded using recycling structure, current shunt technique, positive feedback source degeneration and indirect frequency compensation feedback to enhance transconductance under a reasonable stability. Combining these approaches leads to an ultra‐low‐power high performance amplifier without increasing power dissipation compared to the conventional one. Simulation results in 0.13‐µm complementary metal–oxide–semiconductor technology show the proposed structure achieves a 63‐dB DC gain at 0.25‐V supply voltage with just 20‐nW power dissipation. Copyright © 2016 John Wiley & Sons, Ltd.