I am currently using a pulse generator with a reasonably fast rise-time (something like 1 ns) for some experiments. It works well as long as I am using e.g. 50 Ohm loads but the problem is that it can't source much current, meaning it doesn't work well for lower impedances. Now, my problem is that I am currently doing some experiments where I need to send fast pulses to a diode (well, the IF port of a mixer; but it essentially behaves like a diode); it sort of works as it is but I need more current in order to improve the performance; I probably need something like 50-100 mA. The idea is to put some kind of fast buffer in between the pulse generator and the load. The question is what to use? I would like to keep the rise time below 10 ns (the faster the better) Would a high speed buffer like OPA693 be OK for something like this; or should I go for a MOSFET driver (which would only give a fixed voltage; but can source a lot of current)?