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介绍了一种获取高速调制电信号的新方法-基于FPGA的高速电光选通系统.此系统分为选通脉冲和高压调控两个模块.选通脉冲模块由高速信号放大、FPGA延时、可控延迟传输线三个部分组成.利用FPGA高密度、高可靠性、可反复擦写和可以现场编程、灵活调制的特点,将整个系统的主要控制部分集成在FPGA中,并将延时分为数字延时和模拟延时两部分.然后利用FPGA实现数字延时,可控延时线实现模拟延时.经试验检测,高压部分可以产生重复频率1 Hz ～1 kHz ,步进1 Hz ,延时范围为0 ～1μs ,步进为1 ns ,幅度为8 000 V,前沿和后沿小于10 ns ,抖动小于1 ns的高压矩形电脉冲,从而满足各种电光调制系统中的需要.
This paper introduces a new method of obtaining high speed modulated electrical signal - FPGA-based high-speed electro-optical gating system.This system is divided into two modules: gating pulse and high voltage regulation.The gating pulse module consists of high-speed signal amplification, FPGA delay, Control delay transmission line composed of three parts.Using high-density FPGA, high reliability, repeatable erase and field programming can be programmed, the characteristics of flexible modulation, the entire system of the main control part integrated in the FPGA, and the delay is divided into digital Delay and analog delay two parts.And then use FPGA to achieve digital delay, controllable delay line to achieve analog delay.After the test, the high-voltage part can produce repetition frequency 1 Hz ~ 1 kHz, 1 Hz step, delay High-voltage rectangular electric pulses ranging from 0 to 1μs in steps of 1 ns, amplitudes of 8 000 V, leading and trailing edges less than 10 ns, and jitter less than 1 ns meet the needs of various electro-optic modulation systems.