单次快脉冲模拟信号提前采样的数字化实现

Digital forward sampling on the transient pulsant signal

描述了常见的数据采集系统在采集单次快脉冲信号时所遇到的问题和制约因素.针对该问题,提出了采用数字化的手段实现提前采样的方法.在数字电路中进行预置循环存储方法,来替代在模拟电路中对被测信号进行的延时处理.这样就可以实现在采集完整的脉冲波形的同时,又保证了信号的完整性.并通过对现场可编程门阵列(FPGA)仿真的结果验证了该方法,并在单次快脉冲A/D变换系统中应用了这种方法.根据所选择的FPGA器件自身的性能差别,能实现的数据存储速度最高可达500 Mbyte/s,在这个速度下可存储4 kbyte的数据.

This paper describes the trouble and the limitations of common sampling on the transient pulsant signal. To solve these troubles, this paper mainly introduces the theory and example design of digital forward sampling. The delay of the key signal in an analog circuit is substituted by a technology called＇forward circulatory storing＇ in the digital circuit. We can get the whole pulse of the input signal and keep the signal integrality synchronously thanks to the digital forward sampling theory. This design is validated by FPGA simulation and used in the work of ＂Transient Pulse＇s A/D Conversion＂. This conversion system can store 4 kbyte data with the rate of 500 Mbyte/s by the best FPGA we have chosen.