中文摘要：

为实现高速弱光信号的实时精确探测与自动分析,设计了基于权重自适应算法的高速弱光信号检测系统。首先,设计了低噪声的前置光电转换电路,在最大程度上保证了信噪比;然后,利用数字直流恢复电路对信号进行直流恢复,利用程控放大以及可控滤波电路为后续AD转换电路提供放大后以及放大前的两路信号;最后,利用权重自适应算法,对2路输入信号进行处理。实验表明,整套系统能对0.1 mW、100 kHz的高速小信号进行准确采集,最大程度上保留了脉冲信号的信息，

英文摘要：

Aiming at detecting dim light with high speed signal under various circumstances, a system was designed to achieve weak signal auto-analysis based on adaptive weight algorithm. First, transimpedance pre-amplifier with high SNR was designed. Then, digital DC restore circuit was designed to remove the offset voltage of the signal. The controllable gain amplifier was also added to provide amplified and original signal to the high speed ADC followed. Analog signal was converted into digital signal by ADC chips and FPGA main controller. The signal was processed by the adaptive weight algorithm embedded in the FPGA. Finally the signal was amplified by the factor of 1 -200, with SNR greater than 70dB and linearity higher than 95%.