电流激励神经信号重建系统

Neural signal rebuilding system with current function electrical stimulation (FES) signal generator

本文采用CSMC 0．6μm CMOS工艺设计了一种电流激励神经信号重建系统,适用于卡肤电极系统,包括增益可调的神经信号检测电路、单位增益缓冲级、强负载能力的FES跨导放大电路、负反馈控制的偏置级和输出前馈结构,工作于5V/±2．5V。经时域仿真验证,电路频率响应带宽设计为0．1Hz-10kHz,输出电流最高可达1mA,电路跨导最大可达0．7S,输入失调电压为0．83μV,共模抑制比为-93．82dB。性能满足神经信号重建系统的要求,将用于重建动物实验。

This paper presents an system for neural signal regenerati on with cuff electrodes in CSMC 0.6um CMOS technology. The syetem consists of a neural signal recording amplifier stage with changeable gain, a buffer stage, a function electrical stimulation （FES） transconductance amplifier, a feedback bias stage and a feed -forward output stage. The supply voltage is 5V / ± 2.5V. After being stimulated in time domain, the pass band of the amplifier is set to 0.1Hz-10kHz according to the neural signal spectrum, output current can reach lmA, transconductance is 0.7S, input offset voltage less than 0.83uV with CMRR more than .93.82dB.It can meet the demand of a neural signal regeneration system and will be used in neural signal regeneration animal experiment in future.