| Summary: | 碩士 === 國立交通大學 === 電子研究所 === 99 === This paper presents an 8-channel analog front-end (AFEA) circuit for neural recording systems. An eight-channel chopper stabilized pre-amplifier, an 8-to-1 analog multiplexer, and a programmable gain amplifier are designed. It is designed for amplification of different kinds of biopotential signals, such as electrocorticogram (ECoG), electrocardiogram (ECG) and electromyogram (EMG). These biopotential signals have the characteristics of small amplitudes, low frequency and variability. The maximum gain of AFEA is 74.1dB. The high-pass corner can achieve as low as 0.8Hz and low-pass corner can be adjusted to several kilohertz to suit for different kinds of biosignals. It is fabricated in TSMC 0.18 μm CMOS process and achieves an input-referred noise of 5.1 μVrms (input referred noise of pre-amplifier is only 0.9μVrms), bandwidth up to 7 KHz while only consumes 446 μW at 1.8V power supply. And the noise efficiency factor (NEF) is only 1.3 for pre-amplifier.
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