High-Pass Sigma-Delta Modulator with Techniques of Operational Amplifier Sharing and Programmable Feedforward Coefficients for ECG Signal Acquisition

Shuenn Yuh Lee, Po Han Su, Kuan Lin Huang, Yi Wen Hung, Ju Yi Chen

Research output: Contribution to journalArticlepeer-review

Abstract

A high-pass sigma-delta modulator (HPSDM) is proposed for electrocardiography (ECG) signal acquisition system. The HPSDM is implemented using operational amplifier (op-amp) sharing and programmable feedforward coefficients. The op-amp sharing is adopted to reduce the quantity of amplifiers because they dominate the power consumption of the HPSDM. In addition, given that the magnitude of the ECG is dependent on different persons, programmable feedforward coefficients are utilized to extend the dynamic range of the HPSDM to fit the actual application. The proposed HPSDM is fabricated in a 0.18-μm standard CMOS process. Measurement results reveal that the proposed HPSDM has a signal-to-noise and distortion ratio (SNDR) of 54.5 dB and a power consumption of 2.25 μW under a 1.2 V supply voltage and achieves a figure of merit (FoM) of 12.96 pJ/conv. Moreover, the proposed HPSDM has an SNDR of 64.8 dB and a power consumption of 5.2 μW under a 1.8 V supply voltage and achieves a FoM of 9.15 pJ/conv due to the op-amp sharing technique. Under the 1.2 V and 1.8 V supply voltages, the dynamic range of the HPSDM is extended to approximately 12 dB due to the technique of programmable feedforward coefficients.

Original languageEnglish
Article number9439172
Pages (from-to)443-453
Number of pages11
JournalIEEE transactions on biomedical circuits and systems
Volume15
Issue number3
DOIs
Publication statusPublished - 2021 Jun

All Science Journal Classification (ASJC) codes

  • Biomedical Engineering
  • Electrical and Electronic Engineering

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