From: email@example.com (carltons)
Subject: Re: How to interpret AC Analysis?
User-Agent: NewsWatcher-X 2.2.3b2
NNTP-Posting-Date: Mon, 23 Sep 2002 19:34:58 GMT
Date: Mon, 23 Sep 2002 19:34:59 GMT
In article <7fCj9.8883$DR.firstname.lastname@example.org>, "Kevin
> "John Woodgate" wrote in message
> > 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 time
> > >domain analysis? I do, but I'm weird.
> > You also don't define your variables.(;-) What do you mean by zeta?
> I would guess its the zeta as in 2wn.zeta in the standard 2nd order
> transfer function, but who knows....
> Kevin Aylward
> SuperSpice, a very affordable Mixed-Mode
> Windows Simulator with Schematic Capture,
> Waveform Display, FFT's and Filter Design.
Zeta is the damping factor of the filter equation and its practical
implementation. My reference to it is something that I don't normally
see in an analysis and that is the real IC in the circuit with real
components and not some theoretical circuit with pie in the sky equations
based on assumptions and approximation. If you don't place your circuit
in an rf environment with many frequencies floating around in it, then
don't worry about these things. I've been through this mill before and
it's not fun. It is extremely difficult to explain your assumptions and
approximations to a manager who used to be a mechanical engineer, seven
years ago. :-) Bottom line: better safe than sorry.
BTW, my fingertips still will stabilize most circuits. :-)