Abstract
In order to improve the detection distance of laser proximity fuze without increasing laser power, the capability of laser fuze receiving weak laser echo signal must be improved. An avalanche photodiode (APD), which had the advantages of high sensitivity, low noise, with inner gain, was used as photodetector in laser fuze system to improve the capability of laser fuze detecting weak signal. The equivalent noise model of APD photoelectric conversion was analyzed, and the low-noise preamplifier and voltage amplification circuit matching the avalanche photodiode were designed. The noise ratio and frequency bandwidth of amplification circuit were analyzed and calculated, also the simulation and experimental verification were accomplished. The results showed that the circuit has wide bandwidth and high signal to noise ratio,which meets the requirements of subsequent processing circuitry of laser fuze.
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