A 0.7-V opamp in scaled low-standby-power FinFET technology

Shin Ichi O'uchi, Kazuhiko Endo, Takashi Matsukawa, Yongxun Liu, Tadashi Nakagawa, Yuki Ishikawa, Junichi Tsukada, Hiromi Yamauchi, Toshihiro Sekigawa, Hanpei Koike, Kunihiro Sakamoto, Meishoku Masahara

Research output: Contribution to journalArticlepeer-review


This paper demonstrates a FinFET operational amplifier (opamp), which is suitable to be integrated with digital circuits in a scaled low-standby-power (LSTP) technology and operates at extremely low voltage. The opamp is consisting of an adaptive threshold-voltage (Vt) differential pair and a low-voltage source follower using independent-double-gate-(IDG-) FinFETs. These two components enable the opamp to extend the common-mode voltage range (CMR) below the nominal Vt even if the supply voltage is less than 1.0 V. The opamp was implemented by our FinFET technology co-integrating common-DG-(CDG-) and IDG-FinFETs. More than 40-dB DC gain and 1-MHz gain-bandwidth product in the 500-mV-wide input CMR at the supply voltage of 0.7 V was estimated with SPICE simulation. The fabricated chip successfully demonstrated the 0.7-V operation with the 480-mV-wide CMR, even though the nominal Vt was 400 mV.

Original languageEnglish
Pages (from-to)686-695
Number of pages10
JournalIEICE Transactions on Electronics
Issue number4
Publication statusPublished - 2012 Apr


  • Common-Double-Gate FinFET
  • Common-mode voltage range
  • Differential amplifier
  • Independent-Double-Gate FinFET
  • Low voltage
  • Source follower


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