Re: High Precision Monostable

On Tue, 11 Mar 2008 04:15:10 -0700 (PDT), sergio108
<sergio108@xxxxxxxxx> wrote:

Hi All.
We are working on a project where we need a very stable monostable to
produce 5 microsecond pulses every time an input pulses arrive. We
have tried IC 74123 and 74221 integrated circuits but the pulse width
is not stable enough. Does anyone know a circuit or integrated circuit
that produce high stable pulse width?. We need 5 microsecond pulses +-
0.01%. Actually we work in a range from 1 to 10 microsecond pulse
width.
Thanks for your help or advice.
Sergio


0.01% of 5 us is 100 PPM, namely 500 picoseconds. That's not the sort
of stability you'll get from simple one-shot type circuits, or even a
precision ramp/comparator. If you don't mind the initial output edge
being synchronized to a clock, you could do this with a counter, with
maybe a small additional analog delay to interpolate between clock
ticks... but it will still be a challenge to hold 500 ps over
temperature, and to keep the pulse-width jitter down.

This will easily do it, but it's not cheap:

http://www.highlandtechnology.com/DSS/T560DS.html

What's the project?

John


.

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