Years ago I had a cousin who ran a civilian calibration lab. For calibrating
scopes, etc, for rise time he used a mercury wetted relay which he claimed
had nearly instant rise time and no bounce. Seems that he used a resistive
divider and the mercury relay shunted a portion of the divider. With very
small inductances and capacitance to slow things down it would seem to be
very fast.
Al, k9si, retired
The target is 4ns, while ideas seemed to be clear at some point, now I'm
having doubts if better to use a MOSFET or a bipolar transistor
as the switch element. Experiments with MOSFETs presented me some
difficulties charging the gate capacitance having some trouble to
achieve something in the 4ns region. Well 4ns seems hard whatever device
anyway.
I would be happy to receive some comments/ideas that may pop out of your
heads.
Thanks.
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