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An Auto Adjustable Transimpedance Readout System for Wearable Healthcare Devicesopen access

Authors
Park, HyusimLakshminarayana, ShanthalaPan, ChenyunChung, Hoon-JuJung, Sungyong
Issue Date
Apr-2022
Publisher
MDPI
Keywords
TIA; I-V conversion; CMOS; patch type electrochemical sensing system; healthcare devices
Citation
ELECTRONICS, v.11, no.8
Journal Title
ELECTRONICS
Volume
11
Number
8
URI
https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/25747
DOI
10.3390/electronics11081181
ISSN
2079-9292
2079-9292
Abstract
The objective of this work was to design a versatile readout circuit for patch-type wearable devices consisting of a Transimpedance Amplifier (TIA). The TIA performs Current to Voltage (I-V) conversion, the most widely used technique for amperometry and impedance measurement for various types of electrochemical sensors. The proposed readout circuit employs a digitally controllable feedback resistor (R-f) technique in the TIA to improve accuracy, which can be utilized in a variety of electrochemical sensors within a current range of 0.1 mu A-100 mu A. It is designed to accommodate multiple sensors simultaneously to track multiple target analytes for high accuracy and versatile usage. The readout circuit consists of low power operational amplifier (op-amp) and digital circuit blocks, is designed and fabricated with Magna 0.18 pm Complementary Metal Oxide Semiconductor (CMOS) technology, which provides low power consumption and a high degree of integration. The design has a small size of 0.282 mm(2) and low power consumption of 0.38 mW with a 3.3 V power supply, which are desirable factors in wearable device applications.
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