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Reply-To: "fred bartoli"
From: "fred bartoli"
Subject: Re: Historical question: negative feedback and the op amp
Date: Wed, 13 Nov 2002 11:50:09 +0100
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Organization: Guest of ProXad - France
NNTP-Posting-Date: 13 Nov 2002 11:47:44 MET
Ban a écrit dans le message :
> "Mike" schrieb im Newsbeitrag
> > Harold Black came up with his negative feedback theory in 1927, yet the
> > first op-amp wasn't invented until the 1950s.
> > The op-amp seems like such a natural extension, once you know about
> > feedback. Why did it take so long for the op-amp to come along?
> > -- Mike --
> I do not think OpAmps come from the negative feedback idea, nearly every
> electronic circuit has been using feedback since the beginning of the tube
> Rather the main idea is to combine a functional block in one unit, which
> requires some kind of integration.
> Feedback in itself is more a cure for the unlinearity and other
> shortcomings, nowadays it is no more needed, digital circuits work so
> precise, they do not require feedback. Feedback is an antique thing, it
> wasts power and a *lot* of speed. It is just a crutch not something we
> should cherish.
Are you saying that you're able to build a flipflop without (positive)
Or building the clock oscillator without feedback ?
Or that IIR filters are not being used anymore ?
As Kevin I think feedback will always been used.
That for a very simple reason : whatever the linearity of open loop system
we can achieve, we'll always want (need) to push the limits further.
> ciao Ban
> electronic hardware designer
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