电流激励神经信号再生电路

Neural Signal Regeneration IC with Current Stimulation

介绍了一种电流激励神经信号再生电路,该电路由探测电路和激励电路组成。探测电路由全差分运算放大器和仪表放大器组成。全差分运算放大器从神经元上端探测并放大神经信号,仪表放大器对信号进一步放大。最后激励级的跨导放大器将电压线性的转化为电流。电路采用CSMC0.5μmCMOS工艺设计,芯片版图尺寸为0.93mm×0.60mm。芯片的仿真结果为:在±2.5V供电电压下,功耗为8.1mW,输出电流最高可达0.357mA,输出电阻为152kΩ,总谐波失真小于1.9%。

A current stimulation neural signal regeneration IC which consists of a detecting circuit and a stimulating circuit is presented. Detecting circuit consists of a fully differential operational amplifier and an instrument amplifier. The fully differential operational amplifier detects and amplifies the neural signal from the upper neuron, and the instrument amplifier amplifies the signal further. Finally, the transconductance amplifier of the stimulating circuit linearly translates the voltage signal into current signal. The IC is designed in CSMC 0.5 μm CMOS technology, and it occupies a die area of 0.93mm×0.60mm. The simulation results of the proposed IC are presented： power consumption is 8. 1mW under ±2.5V power supply; the max output current is 0.357mA,the output resistance is 152k Ω and THD is less than 1.9% .