采用FPGA作为主控芯片，在FPGA内部设计了刺激脉冲发生器，多路选择器和串并转换器。
It USES FPGA as its main control chip. The FPGA comprises a spike generator, a serial-to-parallel converter and some multiplexers.
利用可变频脉冲发生器、光电耦合器和F/V转换器组成输出通道，设定阀值；
The threshold voltage is set by output channel comprised of pulse generator, photoelectric coupler and F/V converter, and the detection result is input through photoelectric coupler.
利用可变频脉冲发生器、光电耦合器和F/V转换器组成输出通道，设定阀值；
The threshold voltage is set by output channel comprised of pulse generator, photoelectric coupler and F/V converter, and the detection result is input through photoelectric coupler.
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