A 1-V 50-MHz pseudodifferential OTA with compensation of the mobility reduction

Tien Yu Lo*, Chung-Chih Hung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


This brief presents a high-linearity operational transconductance amplifier (OTA) based on pseudodifferential structures. The linearity is improved by mobility compensation techniques as the device size is scaled down to achieve high speed operation. Transconductance tuning could be achieved by a MOS operating in the linear region. The OTA fabricated in the 0.18-μm CMOS process occupies a small area of 4.5 × 10-3 mm-2. The measured third-order intermodulation (IM3) distortion with a 400 mVPP differential input under 1-V power supply voltage remains below -52 dB for frequency up to 50 MHz. The static power consumption is 2.5 mW. Experimental results demonstrate the agreement with theoretical analyses.

Original languageEnglish
Pages (from-to)1047-1051
Number of pages5
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Issue number12
StatePublished - 1 Dec 2007


  • Low supply voltage
  • Operational transconductance amplifier (OTA)
  • Strong inversion region
  • Subthreshold region
  • Transconductance tuning

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