The Design of a 16-Channel CMOS Analog Front-End Acquisition Circuit with chopper modulation technique for Bio-potential Signal Recording Systems

• Main Authors: Chen, Zhi-Xin, 陳志鑫
• Other Authors: Wu, Chung-Yu
• Format: Others
• Language: en_US
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/q9cxxc

碩士 === 國立交通大學 === 電子工程學系 電子研究所 === 104 === This paper presents an 16-channel analog front-end (AFE) acquisition circuit for neural recording systems. It consists of an 16 channel analog front-end amplifier (AFEA) and 128 KS/s 10b ADC. The AFEA consists 16 analog front-end blocks, a 16-to-1 multiplexer, a trans-impedance amplifier (TIA). Each of the analog blocks in AFEA is implemented a chopper modulation low-noise preamplifier and a programmable transconductance gain amplifier (PTGA). It is designed for amplification, filtering, and converting to digital signals of biopotential signals, These biopotential signals have the characteristics of small amplitudes, low frequency. The AFE acquisition circuit which is fabricated in TSMC 0.18μm CMOS process can adjust gain at three steps(49.1/59.1/67.9 dB) digitally, the high-pass corner can achieve as low as 0.59Hz and low-pass corner can achieve 117 Hz). The input-referred noise of the AFEA is 2.09μVrms. The noise efficiency factor is 3.78 of low-noise preamplifier. The whole AFE acquisition circuit power consumption is 52.3μW where 3.26μW per channel