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References: <email@example.com> <3DD3A787.499E9DDB@webaccess.net>
Subject: Re: Historical question: negative feedback and the op amp
X-Newsreader: Microsoft Outlook Express 5.50.4920.2300
Date: Thu, 14 Nov 2002 16:25:44 GMT
NNTP-Posting-Date: Thu, 14 Nov 2002 11:25:44 EST
Organization: Cox Communications
"Chuck Simmons" wrote in message
> Mike wrote:
> > "Walt Jung" <firstname.lastname@example.org> wrote in message
> > news:email@example.com...
> > > I recently researched this area in writing a historical
> > > section of the ADI book, "Op Amp Applications", which is/was the focus
> > > of a seminar series. See www.analog.com/seminar This book will be
> > > available next week for anyone interested.
> > Walt, this was exactly what I was looking for. In my book collection, I
> > lots of radio and communications books from the pre-WWII period, but
> > systems books don't appear until post-WWII, and most of those that I
> > are from the second half of the 1950's. My suspicion has been that the
> > op-amp was conceptually invented at the same time as control theory, but
> > references are a little thin. You've filled in lots of missing area...
> > thanks!
> Control theory is ancient (going back to water clocks and such) but
> stability criteria for feedback control systems were known in the second
> half of the 19th century.
Yes, I've come across references to stability criteria developed in the 19th
century, but control theory as a separate discipline didn't really arrive
until the WWII time frame. That's what I was thinking of (no slight to
earlier researchers intended).
-- Mike --
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