This type of system is active warning systems from photodiode, luminous diode, the circuit and was enlarged circuit.
本系统属于主动型报警系统，由光电二极管、发光二极管、放大电路及报警电路组成。
2
Avalanche photodiode APD bias circuit generated.
雪崩光电二极管apd的偏压产生电路。
3
It is shown theoretically and experimentally that a photodiode with external guard ring short circuit can not decrease dark current-it will be increased instead.