생체 신호 측정용 저 잡음 저 전력 용량성 계측 증폭기
A Low Noise Low Power Capacitive Instrument Amplifier for Bio-Potential Detection
0
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
We present a precision instrument amplifier (IA) designed for bio-potential acquisition. The proposed IA employs a capac- itively coupled instrument amplifier (CCIA) structure to achieve a rail-to-rail input common-mode range and low gain error. A positive feedback loop is applied to boost the input impedance. Also, DC servo loop (DSL) with pseudo resistors is adopted to suppress electrode offset for bio-potential sensing. The proposed amplifier was designed in a 0.18 μm CMOS technologywith 1.8V supply voltage. Simulation results show the integrated noise of 1.276 μVrms in a frequency range from 0.01 Hz to1 KHz, 65dB SNR, 118dB CMRR, and 58MΩ input impedance respectively. The total current of IA is 38 μA. It occupies740 μm by 1300 μm including the passive on-chip low pass filter.
Abstract
We present a precision instrument amplifier (IA) designed for bio-potential acquisition. The proposed IA employs a capac- itively coupled instrument amplifier (CCIA) structure to achieve a rail-to-rail input common-mode range and low gain error. A positive feedback loop is applied to boost the input impedance. Also, DC servo loop (DSL) with pseudo resistors is adopted to suppress electrode offset for bio-potential sensing. The proposed amplifier was designed in a 0.18 μm CMOS technologywith 1.8V supply voltage. Simulation results show the integrated noise of 1.276 μVrms in a frequency range from 0.01 Hz to1 KHz, 65dB SNR, 118dB CMRR, and 58MΩ input impedance respectively. The total current of IA is 38 μA. It occupies740 μm by 1300 μm including the passive on-chip low pass filter.
참고문헌 (11)
- R. R. Harrison, "A low-power integrated circuit for a wireless 100-electrode neural recording system", IEEE J. Solid-State Circuits, 42(1), pp.123~133 (2007)
- S. B. Lee, "An inductively powered scalable 32-channel wireless neural recording system on-a-chip for neuroscience applications", IEEE Trans. Biomed. Circuits Syst, 4(6), pp.360~371 (2010)
- R. F. Yazicioglu, "200 uW eight-channel EEG acquistion ASIC for ambulatory EEG systems", IEEE Int. Solid-State Circuits Conf. (ISSCC) Dig. Tech. Papers, pp.164~165 (2008)
- J. Yoo, "An 8-Channel Scalable EEG Acquisition SoC With Patient-Specific Seizure Classification and Recording Processor", IEEE J. Solid-State Circuits, 48(1), pp.214~228 (2013)
- Q. Fan, "A 1. 8 W 60 nV", √Hz capacitively-coupled chopper instrumentation amplifier in 65nm CMOS for wireless sensor nodes, 2011, pp.46(7), 1534~1543
- R. P. Areny, "AC instrumentation amplifier for bio impedance measurements", IEEE Trans. Biomed. Eng, 40(8), pp.830~833 (1993)
- 조종민, "수동 소자를 사용하지 않는 가변 이득 증폭기 설계", 한국산업정보학회논문지, 18(5), pp.1~8 (2013), 한국산업정보학회[DOI]
- J. H. Huijsing, "Operational Amplifiers: Theory and Design" (2001), Kluwer Academic
- R. Yazicioglu, "A 30 uW analog signal processor ASIC for portable biopotential signal monitoring", IEEE J. Solid-State Circuits, 46(1), pp.209~223 (2011)
- R. R. Harrison, "A low-power low-noise CMOS amplifier for neural recording applications", IEEE J. Solid-State Circuits, 38(6), pp.958~965 (2003)
- J. Xu, "A 160 uW 8-channel active electrode system for EEG monitoring", IEEE Trans. Biomed. Circuits Syst, 5(6), pp.555~567 (2011)