A 4-μW 0.8-V rail-to-rail input/output CMOS fully differential OpAmp

M. R. Valero*, Santiago Celma-Pueyo, N. Medrano, B. Calvo

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

1 Citation (Scopus)

Abstract

This paper presents an ultra low power rail-to-rail input/output operational amplifier (OpAmp) designed in a low cost 0.18 m CMOS technology. In this OpAmp, rail-to-rail input operation is enabled by using complementary input pairs with gm control. To maximize the output swing a rail-to-rail output stage is employed. For low-voltage low-power operation, the operating transistors in the input and output stage are biased in the sub-threshold region. The simulated DC open loop gain is 51 dB, and the slew-rate is 0.04 V/s with a 10 pF capacitive load connected to each of the amplifier outputs. For the same load, the simulated unity gain frequency is 131 kHz with a 64 phase margin. A common-mode feed-forward circuit (CMFF) increases CMRR, reducing drastically the variations in the output common mode voltage and keeping the DC gain almost constant. In fact, their relative error remains below 1.2 % for a (20C, +120C) temperature span. In addition, the proposed OpAmp is very simple and consumes only 4 W at 0.8 V supply.

Original languageEnglish
Title of host publication2011 7th Conference on Ph.D. Research in Microelectronics and Electronics, PRIME 2011 - Conference Proceedings
Pages137-140
Number of pages4
DOIs
Publication statusPublished - 5 Sep 2011
Event2011 7th Conference on Ph.D. Research in Microelectronics and Electronics, PRIME 2011 - Madonna di Campiglio, Trento, Italy
Duration: 3 Jul 20117 Jul 2011

Publication series

Name2011 7th Conference on Ph.D. Research in Microelectronics and Electronics, PRIME 2011 - Conference Proceedings

Conference

Conference2011 7th Conference on Ph.D. Research in Microelectronics and Electronics, PRIME 2011
CountryItaly
CityMadonna di Campiglio, Trento
Period3/07/117/07/11

Keywords

  • Fully Differential OpAmp
  • Low-voltage Low-power CMOS Design
  • Rail-to-Rail OpAmp

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