[논문]A Potentiostat Readout Circuit with a Low-Noise and Mismatch-Tolerant Current Mirror Using Chopper Stabilization and Dynamic Element Matching for Electrochemical Sensors

Nam, Kyeongsik; Choi, Gyuri; Kim, Hyungseup; Yoo, Mookyoung; Ko, Hyoungho

doi:10.3390/app11188287

[해외논문] A Potentiostat Readout Circuit with a Low-Noise and Mismatch-Tolerant Current Mirror Using Chopper Stabilization and Dynamic Element Matching for Electrochemical Sensors 원문보기

Applied sciences, v.11 no.18, 2021년, pp.8287 -

Nam, Kyeongsik (Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea) , Choi, Gyuri (Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea) , Kim, Hyungseup (Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea) , Yoo, Mookyoung (Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea) , Ko, Hyoungho (Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea)

Abstract ▼ AI-Helper

This paper presents a potentiostat readout circuit with low-noise and mismatch-tolerant current mirror using chopper stabilization and dynamic element matching (DEM) for electrochemical sensors. Current-mode electrochemical sensors are widely used to detect the blood glucose and viruses in the diagnosis of various diseases such as diabetes, hyperlipidemia, and the H5N1 avian influenza virus (AIV). Low-noise and mismatch-tolerant characteristics are essential for sensing applications that require high reliability and high sensitivity. To achieve these characteristics, a proposed potentiostat readout circuit is implemented using the chopper stabilization scheme and the DEM technique. The proposed potentiostat readout circuit consists of a chopper-stabilized programmable gain transimpedance amplifier (TIA), gain-boosted cascode current mirror, and a control amplifier (CA). The chopper scheme, which is implemented in the TIA and CA, can reduce low frequency noise components, such as 1/f noise, and can obtain low-noise levels. The mismatch offsets of the cascode current mirror can be reduced by the DEM operation. The proposed current-mirror-based potentiostat readout circuit is designed using a standard 0.18 μm CMOS process and can measure the sensor current from 350 nA to 2.8 μA. The input-referred noise integrated from 0.1 Hz to 1 kHz is 21.7 pARMS, and the power consumption was 287.9 μW with a 1.8 V power supply.

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