An ultra low-power low-voltage class AB CMOS fully differential OpAmp

M. R. Valero, S. Celma, N. Medrano, B. Calvo, C. Azcona

Research output: Chapter in Book/Report/Conference proceedingConference contribution

15 Citations (Scopus)

Abstract

This paper presents an ultra low-power class AB operational amplifier (OpAmp) designed in a low-cost 0.18 μm CMOS technology. Rail-to-rail input operation is achieved by using complementary input pairs with adaptive bias to enhance slew-rate. A class AB output stage is employed. For low-voltage low-power operation, the transistors both in the input and the output stage are biased in the sub-threshold region. The simulated DC open loop gain is 51 dB, the unity gain frequency is 40 kHz with a 65° phase margin and the slew-rate is 0.12 V/μs with 10 pF capacitive loads. A common-mode feed-forward circuit (CMFF) increases CMRR, keeping the DC gain almost constant: its relative error remains below 1 % for a (-40°C, +120°C) temperature range. The proposed OpAmp consumes only 1 μW at 0.8 V supply.
Original languageEnglish
Title of host publication2012 IEEE International Symposium on Circuits and Systems
Place of PublicationU.S.A.
PublisherIEEE
Pages1967-1970
Number of pages4
DOIs
Publication statusPublished - 20 Aug 2012
Event2012 IEEE International Symposium on Circuits and Systems - ISCAS 2012 - Seoul, Korea (South)
Duration: 20 May 201223 May 2012

Conference

Conference2012 IEEE International Symposium on Circuits and Systems - ISCAS 2012
CitySeoul, Korea (South)
Period20/05/1223/05/12

Keywords

  • CMOS integrated circuits
  • feedforward
  • operational amplifiers
  • CMFF
  • CMOS technology
  • common mode feedforward circuit
  • complementary input pairs
  • frequency 40 kHz
  • gain 51 dB
  • low power low voltage class AB operational amplifier
  • power 1 muW
  • rail-to-rail input operation
  • simulated DC open loop gain
  • size 0.18 mum
  • slew rate
  • subthreshold region
  • temperature -40 degC to 120 degC
  • unity gain frequency
  • voltage 0.8 V
  • Gain
  • MOS devices
  • Operational amplifiers
  • Rail to rail inputs
  • Temperature distribution
  • Transistors

Fingerprint Dive into the research topics of 'An ultra low-power low-voltage class AB CMOS fully differential OpAmp'. Together they form a unique fingerprint.

  • Cite this

    Valero, M. R., Celma, S., Medrano, N., Calvo, B., & Azcona, C. (2012). An ultra low-power low-voltage class AB CMOS fully differential OpAmp. In 2012 IEEE International Symposium on Circuits and Systems (pp. 1967-1970). IEEE. https://doi.org/10.1109/ISCAS.2012.6271661