舰船电子工程2025，Vol.45Issue(4)：104-110,7.DOI:10.3969/j.issn.1672-9730.2025.04.022
一种用于神经信号采集的模拟前端设计
An Analog Front End for Neural Recording
杭晋文 1卜刚1
作者信息
- 1. 南京航空航天大学电子信息工程学院 南京 211106
- 折叠
摘要
Abstract
This study presents a neural recording analog front end(AFE)including a low noise amplifier(LNA)and a low power third-order continuous time Sigma Delta modulator(CT-SDM).The LNA is a multiplying by 8 to 40 adjustable gain capaci-tance-coupled chopper instrumentation amplifier(CCIA).To reject the electrode offset,a novel chopper circuit is designed.The CT-SDM has a third-order feed-forward type loop filter,a 5-bit SAR type ADC as the coarse quantizer and 25 times or 50 times ad-justable over-sampling rate(OSR),using duty-cycled resistor to adjust integral constant.The AFE is implemented in SMIC 0.18 μm CMOS process and powered using a 1.8 V power supply.Simulation results show that the designed CCIA consumes 5 μW and has the input referred noise(IRN)of 7 μVrms(0.5 kHz～10 kHz).The CT-SDM,has a bandwidth of 10 kHz,consuming 17.68 μW in high-resolution mode and 9.2 μW in low-power mode.It achieves a peak signal to noise and distortion ratio of 93.1 dB in high-resolution mode and 87 dB in low power mode for a 2 VPP differential input at 5 kHz.The ADC's figure of merit(FoMS)(using SNDR)is 180.7 dB in high-resolution mode,and 177.4 dB in low-power mode.关键词
神经信号采集/电容耦合斩波仪表放大器/连续时间Sigma Delta调制器/电极直流失调电压/低功耗Key words
neural recording/CCIA/CT-SDM/electrode offset/low power分类
信息技术与安全科学引用本文复制引用
杭晋文,卜刚..一种用于神经信号采集的模拟前端设计[J].舰船电子工程,2025,45(4):104-110,7.
