The DAC transfers the data stored in EPROM to the gate of MOS transistor so as to control the bias current, and tune the responsivity of detector and dummy detector.

• 用数模转换器将存储在EPROM内的偏置电压输出到MOS管的栅极上,实现对偏置电流的控制,调节探测元及补偿元的响应率。