[논문]A Low-Power, Low-Noise, Resistive-Bridge Microsensor Readout Circuit with Chopper-Stabilized Recycling Folded Cascode Instrumentation Amplifier

Choi, Gyuri; Heo, Hyunwoo; You, Donggeun; Kim, Hyungseup; Nam, Kyeongsik; Yoo, Mookyoung; Lee, Sangmin; Ko, Hyoungho

doi:10.3390/app11177982

[해외논문] A Low-Power, Low-Noise, Resistive-Bridge Microsensor Readout Circuit with Chopper-Stabilized Recycling Folded Cascode Instrumentation Amplifier 원문보기

Applied sciences, v.11 no.17, 2021년, pp.7982 -

Choi, Gyuri (Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea) , Heo, Hyunwoo (Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea) , You, Donggeun (Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea) , Kim, Hyungseup (Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea) , Nam, Kyeongsik (Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea) , Yoo, Mookyoung (Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea) , Lee, Sangmin (Department of Biomedical Engineering, Kyung Hee University, Yongin 17104, Korea) , Ko, Hyoungho (Department of Electronics Engineering, Chungnam National University, Daejeon 34134, Korea)

Abstract ▼ AI-Helper

In this paper, a low-power and low-noise readout circuit for resistive-bridge microsensors is presented. The chopper-stabilized, recycling folded cascode current-feedback instrumentation amplifier (IA) is proposed to achieve the low-power, low-noise, and high-input impedance. The chopper-stabilized, recycling folded cascode topology (with a Monticelli-style, class-AB output stage) can enhance the overall noise characteristic, gain, and slew rate. The readout circuit consists of a chopper-stabilized, recycling folded cascode IA, low-pass filter (LPF), ADC driving buffer, and 12-bit successive-approximation-register (SAR) analog-to-digital converter (ADC). The prototype readout circuit is implemented in a standard 0.18 µm CMOS process, with an active area of 12.5 mm2. The measured input-referred noise at 1 Hz is 86.6 nV/√Hz and the noise efficiency factor (NEF) is 4.94, respectively. The total current consumption is 2.23 μA, with a 1.8 V power supply.

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