RE: [SI-LIST] : Passivity of a Linear System

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From: Mckinley, Jory (Jory.Mckinley@compaq.com)
Date: Thu Dec 02 1999 - 11:49:40 PST


Hello Christian,
Off the top if your linear system contains poles that are negative then you
may have an active system (for example negative resistance in an RC filter
low pass filter). A causal system requires an input(s) stimulus to cause a
response so I am not sure if you can tell from the transfer function alone.
Enjoy,
Jory

-----Original Message-----
From: Christian Schuster [mailto:schuster@iis.ee.ethz.ch]
Sent: Thursday, December 02, 1999 1:59 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : Passivity of a Linear System

Dear SI-List-Listeners,

I know that the following question is somewhat beyond the
scope of the usual list topics but nevertheless I hope
to get some feedback from you ...

Question: Given the poles and zeros of a linear system,
          how can I decide if its passive?

Or weaker: How can I decide if its causal?

Any input is very much appreciated.

Best regards,

Ch. Schuster

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