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Date: Sun, 17 Nov 2002 11:02:12 -0500
From: "Raymond E. Rogers"
X-Mailer: Mozilla 4.76 [en] (Win95; U)
Subject: Re: Historical question: negative feedback and the op amp
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Chuck Simmons wrote:
> "Kevin G. Rhoads" wrote:
> > >Remarkably little changes when you
> > >substitute digital methods.
> > Except that while a constant signal and a "bed of nails"
> > have different Laplace transforms, they have identical
> > z-transforms ;-) Too many people go to digital and
> > forget they are now dealing with an inherently sampled
> > system. The other side of "aliasing" is that you can't
> > see what happens "during the holes".
> > (Oversimplified, but I felt worth mentioning.)
> Yes, I think of it as blind time. That is, the dynamical system can do
> anything it wants and I won't see it. This is particularly messy in
> digital systems where antialiasing filters are impossible (systems where
> the sensor is inherenty sampled as in disk drive head positioning
> servos). I have seen this so bad that it required mechanical redesign.
My old sampled data systems box mentions using a "Modified Z transform"
in order to peek between the samples during design. Is this just an
idea that died? I have always managed to up the sample rate beyond the
physics, but was going to use it if that couldn't be done.
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