A 0.8-V 1.2-μW rail-to-rail fully differential OpAmp with adaptive biasing

Author

Valero, M.R. ; Celma, S. ; Medrano, N. ; Calvo, B.

Author_Institution

Group of Electron. Design - I3A, Univ. of Zaragoza, Zaragoza, Spain

fYear

2012

fDate

17-21 Sept. 2012

Firstpage

77

Lastpage

80

Abstract

This paper presents an ultra low-power rail-to-rail fully differential operational amplifier (OpAmp) fabricated in a standard 0.18 μm CMOS technology. The proposed circuit uses transistors biased in the sub-threshold region for low-voltage low-power operation. For a 0.8 V single supply and 8 pF loads, experimental measurements shows a 51 dB open loop gain, 62° phase margin, 57 kHz unity gain frequency and a 750 mV linear output swing. Adaptive biasing provides 0.14 V/μs slew-rate, while a 73 dB CMRR is achieved thanks to a CMFF circuit, demonstrating the correct functionality of the OpAmp with a power consumption of 1.2 μW.

Keywords

CMOS analogue integrated circuits; differential amplifiers; low-power electronics; operational amplifiers; transistor circuits; CMFF circuit; CMOS technology; OpAmp; adaptive biasing; frequency 57 kHz; gain 51 dB; linear output swing; low-voltage low-power operation; power 1.2 muW; power consumption; size 0.18 mum; slew-rate; subthreshold region; transistor biasing; ultra low-power rail-to-rail fully differential operational amplifier; voltage 0.8 V; voltage 750 mV; CMOS integrated circuits; Gain; Operational amplifiers; Rail to rail inputs; Temperature measurement; Transistors; Voltage measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

ESSCIRC (ESSCIRC), 2012 Proceedings of the

Conference_Location

Bordeaux

ISSN

1930-8833

Print_ISBN

978-1-4673-2212-6

Electronic_ISBN

1930-8833

Type

conf

DOI

10.1109/ESSCIRC.2012.6341260

Filename

6341260