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From: John Woodgate
Subject: Re: Historical question: negative feedback and the op amp
Date: Thu, 14 Nov 2002 19:45:35 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Thu, 14 Nov 2002 21:12:34 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Chuck Simmons
wrote (in <3DD3BBC3.6430E797@webaccess.net>)
about 'Historical question: negative feedback and the op amp', on Thu,
14 Nov 2002:
>The problem comes about because you
>cannot control pole locations and sero locations at the same time. Since
>pole locations determine stability, it is necessary to let the zeros
>fall where they may.
Do you always have too few degrees of freedom to fix everything
>There is one other case somewhat interesting to me which is changing
>from one control law to another on the fly. Generally, this can be done
>smoothly with a full state space implementation so that the old states
>can be plugged into the new control law.
This is sort of like drawing a complex curve with French curves.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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