Re: [sdiy] SVF & phase

[Magnus Danielson]

From: jhaible at debitel.net
Subject: =?ISO-8859-1?Q?Re: [sdiy]?= SVF & phase
Date: Thu, 28 Nov 2002 17:59:49 +0000 (UTC)

Dear Jürgen,

> > That's a though one... (or... you gonna hate me after this)
> 
> That was an excellent lesson on filters, Magnus!

Thanks!

I wanted to convey some of the important facts and also give a clear connection
to the poles and zeros, which can seem vague at the best.

However, there was a weak point in the end of my discussion, a little quantum
leap in the discussion so to speak. I never really clearly explained _why_ a
finit, and most importantly, just a handfull of poles and zeros does not
provide the necessary power to change amplitude with no phase impairments.

I think however that I brought in the basis for some other understanding, so
hopefully people can figure it out once they've got the tools in their hands.

Once you've learned how this "tool" works, it doesn't matter if you work in
uHz, mHz, kHz, MHz or GHz, the tool works the same way. Sure, transmission
lines helps to confuse the issues somewhat, but that is actually just a variant
you need to learn. In audio we call it loudspeakers and room acoustics, yeat
again, same tools as when we toss GHz down a pair of copper traces on a PCB.
A little variation in parameter values and parameter names.

Cheers,
Magnus - loves tools like MLSSA, Network analysers and TDR/TDTs