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Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
Subject: Re: How to interpret AC Analysis?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
X-Inktomi-Trace: public1-pete2-5-cust19.pete.broadband.ntl.com 1032939363 29937 18.104.22.168 (25 Sep 2002 07:36:03 GMT)
Date: Wed, 25 Sep 2002 08:35:56 +0100
NNTP-Posting-Date: Wed, 25 Sep 2002 08:36:04 BST
"carltons" wrote in message
> In article <7fCj9.8883$DR.firstname.lastname@example.org>, "Kevin
> Aylward" wrote:
> > "John Woodgate" wrote in message
> > news:SOWxVWADRsj9Ew2n@jmwa.demon.co.uk...
> > > I read in sci.electronics.design that carltons
> > > wrote (in
> > > > om>) about 'How to interpret AC Analysis?', on Sun, 22 Sep 2002:
> > > > BTW, does
> > > >anyone ever check the zeta of the filter that they design using
> > > >domain analysis? I do, but I'm weird.
> > >
> > > You also don't define your variables.(;-) What do you mean by
> > I would guess its the zeta as in 2wn.zeta in the standard 2nd order
> > transfer function, but who knows....
> Zeta is the damping factor of the filter equation and its practical
> implementation. My reference to it is something that I don't
> see in an analysis
Because it *only* has meaning in a 2nd order system. Standard filter
design takes car of such issues all in the wash.
>and that is the real IC in the circuit with real
> components and not some theoretical circuit with pie in the sky
> based on assumptions and approximation.
But this has nothing to do with zeta. Component variations and
imperfections of course, have to be dealt with.
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
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