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ADC前段 电压跟随器选择

电压信号特性:脉冲信号,幅度 0.1Vpp-5Vpp, 脉宽 40ns(25MHz),每50ms来一次脉冲,信号高阻。

后续会接一个VGA(可变增益放大器)

这个跟随器主要用来做缓冲,隔离,阻抗匹配的。

请问老师们,该选哪种放大器来用作跟随?