Analogue frontend amplifiers for bio-potential measurements manufactured with a-IGZO TFTs on flexible substrate

C. Garripoli, J.L. van der Steen, F. Torricelli, M. Ghittorelli, G.H. Gelinck, A.H.M. van Roermund, E. Cantatore

Research output: Contribution to journalArticleAcademicpeer-review

15 Citations (Scopus)
366 Downloads (Pure)

Abstract

Three novel differential amplifier topologies using double gate a-IGZO TFTs on flexible substrate are presented in this paper. The designs exploit positive feedback and a load with self-biased top gate to achieve the highest static gain in single stage a-IGZO amplifiers reported to date. After fabrication, the three amplifiers exhibit respectively a static gain of 14 dB, 21.5 dB and 30 dB, with a bandwidth of 2 kHz, 400 Hz, and 150 Hz. Also, for each circuit the input referred noise has been measured to be 420 μVrms, 195 μVrms and 146 μVrms, respectively. Based on these results, the a-IGZO amplifier providing the highest gain is suitable as front-end for heart rate measurements and, with some further optimization verified in simulation, can also be used for other bio-potential applications, like electro hysterogram and electro cardiogram.

Original languageEnglish
Article number7733099
Pages (from-to)60-70
Number of pages11
JournalIEEE Journal on Emerging and Selected Topics in Circuits and Systems
Volume7
Issue number1
DOIs
Publication statusPublished - 15 Mar 2017

Keywords

  • ECG
  • EHG
  • EMG
  • a-IGZO
  • amplifier
  • bio-potential
  • flexible
  • flicker noise
  • front-end
  • thin film transistor

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