Chen Wei-Ming, Yang Wen-Chia, Tsai Tzung-Yun, Chiueh Herming, Wu Chung-Yu
Department of Electronics Engineering and Institute of Electronics, National Chiao Tung University, Hsinchu, Taiwan.
Annu Int Conf IEEE Eng Med Biol Soc. 2011;2011:4784-7. doi: 10.1109/IEMBS.2011.6091185.
In this paper an 8-channel CMOS general-purpose analog front-end (AFE) circuit with tunable gain and bandwidth for biopotential signal recording systems is presented. The proposed AFE consists of eight chopper stabilized pre-amplifiers, an 8-to-1 analog multiplexer, and a programmable gain amplifier. It can be used to sense and amplify different kinds of biopotential signals, such as electrocorticogram (ECoG), electrocardiogram (ECG) and electromyogram (EMG). The AFE chip is designed and fabricated in 0.18-μm CMOS technology. The measured maximum gain of AFE is 60.8 dB. The low cutoff frequency can achieve as low as 0.8 Hz and high cutoff frequency can be adjusted from 200 Hz to 10 kHz to suit for different kinds of biopotential signals. The measured input-referred noise is 0.9 μV(rms), with the power consumption of 18μW per channel at 1.8-V power supply. And the noise efficiency factor (NEF) is only 1.3 for pre-amplifier.
本文提出了一种用于生物电位信号记录系统的具有可调增益和带宽的8通道CMOS通用模拟前端（AFE）电路。所提出的AFE由八个斩波稳定前置放大器、一个8选1模拟多路复用器和一个可编程增益放大器组成。它可用于感测和放大不同类型的生物电位信号，如皮质电图（ECoG）、心电图（ECG）和肌电图（EMG）。该AFE芯片采用0.18μm CMOS技术设计和制造。测得的AFE最大增益为60.8dB。低截止频率可低至0.8Hz，高截止频率可在200Hz至10kHz之间调节，以适应不同类型的生物电位信号。测得的输入参考噪声为0.9μV（rms），在1.8V电源下每通道功耗为18μW。前置放大器的噪声效率因子（NEF）仅为1.3。
