Re: over 100% overshoot and no ossilating?

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Article #4386

#4386

From: Andrew Karanicolas
Date: Sat, 17 Mar 1990 07:23

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In article <1990Mar16.204939.1176@spectre.ccsf.caltech.edu> ghl@tybalt.caltech.edu (Gwoho H. Liu) writes:
>i have a feedback amplifier that seems to over shoot a step by over
>100% then it jiggles a bit and flattens out. it does not ossilate
>for ever and ever. can someone explain this?

One way to achieve more than 100% overshoot with a stable amplifier is with 
a closed loop zero.  In this case, the step response is not the classic 
two-pole feedback system step response.   If you can supply more circuit 
details, then the origin of this closed loop zero could be investigated.

Andrew Karanicolas
MIT Microsystems Laboratory
ankleand@caf.mit.edu

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!snorkelwacker!mit-eddie!mit-amt!mit-caf!ankleand
From: ankleand@mit-caf.MIT.EDU (Andrew Karanicolas)
Newsgroups: sci.electronics
Subject: Re: over 100% overshoot and no ossilating?
Message-ID: <4140@mit-caf.MIT.EDU>
Date: 17 Mar 90 07:23:29 GMT
References: <1990Mar16.204939.1176@spectre.ccsf.caltech.edu>
Reply-To: ankleand@mit-caf.UUCP (Andrew Karanicolas)
Distribution: sci
Organization: Microsystems Technology Laboratories, MIT
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