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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: Historical question: negative feedback and the op amp
References: <3DD25F72.5793B8D5@webaccess.net> <6PuA9.5701$XF5.email@example.com> <3DD27F3D.667A4D75@webaccess.net> <3DD2FD36.8877972F@webaccess.net> <3DD3A4A5.688DDDDD@webaccess.net> <3DD4635C.3E820E6C@webaccess.net> <3DD4FFD5.6CAC2E10@webaccess.net> <01c28dd2$e3ba9660$0100007f@stupidwin95>
Date: Sun, 17 Nov 2002 15:44:42 GMT
NNTP-Posting-Date: Sun, 17 Nov 2002 07:44:42 PST
"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.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org
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