[time-nuts] homebrew counter new board test result

Attila Kinali attila at kinali.ch
Thu Feb 26 08:00:33 EST 2015


On Wed, 25 Feb 2015 01:44:40 -0800
Hal Murray <hmurray at megapathdsl.net> wrote:

> The Schmitt trigger mostly avoids glitches on the output.  Does it do 
> anything to reduce timing noise if the input signal is clean enough that it 
> doesn't make any glitches?

A Schmitt Trigger avoids glitches at the input, not the output.
It does prevent the input circuitry in the gate to switch back and forth
between 0 and 1, or, even worse, from going metastable.

This by itself might improve timing, if you have problems due to low
slew rate. But as Magnus wrote, in general does not improve things.


			Attila Kinali
-- 
It is upon moral qualities that a society is ultimately founded. All 
the prosperity and technological sophistication in the world is of no 
use without that foundation.
                 -- Miss Matheson, The Diamond Age, Neil Stephenson


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