An ultralow-power low-voltage class-AB fully differential opamp for long-life autonomous portable equipment

María Rodanas Valero*, S. Celma, N. Medrano, B. Calvo

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

55 Citations (Scopus)

Abstract

This brief presents an ultralow-power class-AB operational amplifier (OpAmp) designed in a low-cost 0.18-μm CMOS technology. The proposed circuit uses transistors biased in the subthreshold region for low-voltage low-power operation. For a 0.8-V single supply, this OpAmp has 51-dB open-loop gain, 57-kHz unity-gain frequency, 60° phase margin, and 65-dB common-mode rejection ratio for 8-pF loads with a power consumption of only 1.2 μW. Experimental results illustrate performances such as a 0.14-Vμs slew rate and a 750-mV linear output swing, demonstrating its correct functionality.

Original languageEnglish
Article number6294513
Pages (from-to)643-647
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Volume59
Issue number10
DOIs
Publication statusPublished - 10 Sep 2012

Keywords

  • CMOS analog integrated circuits
  • low-power design
  • operational amplifiers (OpAmps)

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