Without buying every gain block and ADC driver there is, I would like to know which amplifiers in the Gain blocks such as ADL5611 and ADA4960 will pass a 2 ns wide pulse without distortion. That is, the delay should be constant across the bandwidth. Many RF amplifiers with turn a rectangular pulse into a triangle.
I assume the ADC Driver/line Drivers do not do this, but am unclear as to which of the ADL amplifiers are pulse stable.