A high-performance 1.2 V–99 μW rail-to-rail CMOS class AB amplifier

Maria D R Valero, Nicolas Medrano, Belén Calvo, Santiago F Celma

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


This paper presents a compact, reliable 1.2 V low-power rail-to-rail class AB operational amplifier (OpAmp) suitable for integrated battery powered systems which require rail-to-rail input/output swing and high slew-rate while maintaining low power consumption. The OpAmp, fabricated in a standard 0.18 μm CMOS technology, exhibits 86 dB open loop gain and 97 dB CMRR. Experimental measurements prove its correct functionality operating with 1.2 V single supply, performing very competitive characteristics compared with other similar amplifiers reported in the literature. It has rail-to-rail input/output operation, 5 MHz unity gain frequency and a 3.15 V/μs slew-rate for a capacitive load of 100 pF, with a power consumption of 99 μW.
Original languageEnglish
Pages (from-to)96-102
Number of pages7
JournalMicroelectronics journal
Issue number1
Early online date26 Nov 2014
Publication statusPublished - 1 Jan 2015


  • CMOS analog integrated circuits
  • Low-power design
  • Operational amplifiers

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