[time-nuts] fast edge, rise time.

[J. Forster]

Are only the amplitude and rep rate variable, or do you vary the width too?

-John

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> Many thanks to all for the nice tips.
>
> I may narrow down by saying a few more specs as suggested.
> The pulse would see a somehow unknown load but for a start I
> was suggested to have my source with 50ohm impedance so worst
> case would be a short circuit and therefore the pulse would be a current
> pulse
> and would have some 10Amp. Pulse length about 100ns so only some 0.5mJ
> energy that would die inside the pulse source( this would be the worst
> case).
> The 100us repetition rate make a a very small duty cycle of 1/1000 so
> average power
> maximum 5W.
>
> Since the amplitude and timing parameters are to be controlled (pulse
> timing come from an FPGA) I really need a solution using that trivial
> switching element fet or bipolar (and can't really do a more exotic
> scheme if I cant electronically control the parameters) also I must use
> a transformer because these short pulse are to be superimposed to
> another voltage and a transformer becomes very handy to do that. I
> interrupt the wire and insert the secondary there to add the pulses.
>
> The challenge I'm facing is on the device either RF FET or Biplolar tr
> etc. and
> surrounding circuits, transformer, etc. this to achieve the 4ns (or 5ns).
> (the transformer I have in mind is something very similar to those
> transformers
> on the final stages of HF/VHF ham radio amps, coax cables and ferrite
> cores)
> any suggestion regarding devices etc ?...
>
> Thanks for all comments.
>
> Luis Cupido.
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