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Optical technology and microelectronic technology, combined with modern information industry has brought new breakthrough development, especially the photoelectric detection in the military field application prospect. Aiming at the wavelength for 0.905 u m laser pulse, design a weak photoelectric signal detection system. Mainly by the APD, transresistance amplifying circuit, voltage gain control circuit, peak hold circuit composition. Taking 0.905 u m wavelength and ns pulse width of laser signal as detection optical pulse, from wavelength, power, noise, such as the probability of detection system index. The scheme adopts the hamamatsu company S9251 series of APD for photoelectric conversion, first of all to NE5210 for transresistance amplification, and then to AD8330 on voltage gain controlled amplifier, and to keep MAX436 peak, according to the characteristics of the circuit are given noise, the bandwidth of the model. In this paper, the detection circuit design ideas for future similar circuit design has important significance.
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