A 0.6V 3.8μW ECG/bio-impedance monitoring IC for disposable health patch in 40nm CMOS

Jiawei Xu, Qiuyang Lin, Ming DIng, Yao Li, Chris Van Hoof, Wouter Serdijn, Nick Van Helleputte

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

11 Citations (Scopus)
27 Downloads (Pure)

Abstract

Simultaneous measurement of Electrocardiogram (ECG) and bio-impedance (BioZ) via disposable health patches is desired for patients suffering from chronic cardiovascular and respiratory diseases. However, a sensing IC must consume ultra-low power under a sub-volt supply to comply with miniaturized and disposable batteries. This work presents a 0.6 V analog frontend (AFE) IC consisting of an instrumentation amplifier (IA), a current source (CS) and a SAR ADC. The AFE can measure ECG and BioZ simultaneously with a single IA by employing an orthogonal chopping scheme. To ensure the IA can tolerate up to 300mVpp DC electrode offset and 400mV pp common-mode (CM) interference, a DC-servo loop (DSL) combined with a common-mode feedforward (CMFF) loop is employed. A buffer-assisted scheme boosts the IA's input impedance by 7x to 140MΩ at 10Hz. To improve the BioZ sensitivity, the CG utilizes dynamic element matching to reduce the 1/f noise of the output current, leading to 35mΩ/√Hz BioZ sensitivity down to 1Hz. The ADC shows a 9.7b ENOB when sampled at 20ksps. The total power consumption of the AFE is 3.8μW.

Original languageEnglish
Title of host publication2018 IEEE Custom Integrated Circuits Conference, CICC 2018
EditorsAlessandro Piovaccari, Hua Wang
Place of PublicationPiscataway, NJ, USA
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1-4
Number of pages4
ISBN (Electronic)978-1-5386-2483-8
DOIs
Publication statusPublished - 2018
Event2018 IEEE Custom Integrated Circuits Conference, CICC 2018 - San Diego, United States
Duration: 8 Apr 201811 Apr 2018

Conference

Conference2018 IEEE Custom Integrated Circuits Conference, CICC 2018
CountryUnited States
CitySan Diego
Period8/04/1811/04/18

Keywords

  • bio-impedance
  • ECG
  • instrumentation amplifier
  • low noise current source
  • low supply

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