Tom said:
Hello,
I am trying to use a rising edge of a clock to generate a
sub-nanosecond pulsewidth. Does anyone know of any components out
there that can be used to achieve this?
Thanks
How sub?
How big?
Are you ever gonna need a second one? How soon?
If you look into the emitter of an emitter follower, you
can convince yourself that a first order approximation to
the behavior is a resistor and inductor in parallel.
If you stuff in a current step, you get a voltage pulse.
It's amplitude and tempco compatible with the old MECL III logic
family.
The interesting part of the behavior is that when you turn off
the current, the (virtual) inductor goes away. Makes a way cool short pulse
generator without all the nasty ringing properties of a shorted
transmission line or a real inductor. And if you drive it too fast
(rep rate) it just becomes sorta transparent. One-port devices are neat.
For a given state of technology, you can probably get shorter pulses
than with a gate-delay differientiator.
I used it at rep rates of 250 MHz. 30 years ago.
mike
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