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脉冲恒流源设计问题

Hi team 

Good day

客户向设计一个脉冲恒流源,信息如下,麻烦帮忙看下:

设计一个脉冲恒流源,输入为20ns脉宽,周期为2ms的脉冲,达到输出跟随脉冲输入,20n脉宽,2ms周期的恒流源输出,要求恒流源电流可调,最大可输出500mA的电流,帮忙看下有什么方案设计。

Regards

Aosker