A noise reconfigurable current-reuse resistive feedback amplifier with signal-dependent power consumption for fetal ECG monitoring

Shuang Song, M.J. Rooijakkers, P. Harpe, C. Rabotti, M. Mischi, A.H.M. Van Roermund, E. Cantatore

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)
180 Downloads (Pure)

Abstract

This paper presents a noise-reconfigurable resistive feedback amplifier with current-reuse technique for fetal ECG monitoring. The proposed amplifier allows for both tuning of the noise level and changing the power consumption according to the signal properties, minimizing the total power consumption while satisfying all application requirements. The amplifier together with its amplitude detector and dynamical biasing circuit is implemented in a standard 0.18-μm CMOS process. Measurements demonstrate that the proposed current-reuse resistive feedback topology improves the power efficiency of the conventional resistive feedback amplifier, achieving at the same time a good noise efficiency factor (NEF =2.8) and an input impedance of 20 MΩ. The amplitude detector and the dynamical biasing circuit, which tunes the current in the amplifier according to the signal amplitude, save up to 40% of the total power consumption. The amplifier achieves a measured noise level of 0.34 μ Vrms in a 0.6-175-Hz band, consuming 6.3-μW power.

Original languageEnglish
Article number7508439
Pages (from-to)8304-8313
Number of pages10
JournalIEEE Sensors Journal
Volume16
Issue number23
DOIs
Publication statusPublished - 1 Dec 2016

Keywords

  • current-reuse
  • Electrocardiography
  • NEF
  • resistive feedback
  • signal dependent power

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