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0~1 μs，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.

A novel approach called high speed electro-optic gating system was introduced to obtain the high speed electrical modulation signal. The system consists of two modules: gating pulse module and high voltage modulation module. The gating pulse module includes high-speed signal amplifier, FPGA (Filed Programmable Gate Array) delayer and controllable delayed transmission-line. The integration of the significant control function into FPGA achieves a number of desired properties such as high density, high integrated, erasable, filed programmable, and modulation-flexible. The overall delay was separated into digital delay and analog delay, which were finished by FPGA and controllable delayed transmission-line respectively. Experiments show that the system can generate a high-voltage rectangular electrical pulse with repetition frequency 1 Hz to 1 kHz, stepping 1 Hz, delay range from 0 to 1 μs, stepping 1ns, high voltage range from 0 V to 8 000 V, rising edge and falling edge within 10ns, jitter within 1ns. It can be applied to various electro-optic equipments.