[SI-LIST] Re: Passivity/Causality
- From: "Hargin, Bill" <bill_hargin@xxxxxxxxxx>
- To: <ria_rr_84@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 7 Dec 2007 04:42:57 -0800
Hi Ria:
In the digital SI world, Scattering Parameter (aka: S-Parameter;
Touchstone) models are often used to describe passive parts of an
interconnect. (E.g., package models, connectors, vias, typically any
part of the channel that's passive, or even an entire backplane.)
Causality: In these S-Parameter or Touchstone models, you can't have an
effect that precedes its cause. (E.g., the lights turning on before
you've thrown the switch.)
Passivity: A passive S-Parameter interconnect model cannot create
energy. =20
Checking a model for passivity and causality is another (longer)
discussion. Mentor users (HyperLynx, ICX, ICX Pro) are provided with
something we call the Touchstone Viewer, which allows them to check a
model for passivity and causality, among a number of other things. =20
Bill Hargin
High-Speed Marketing Manager
Mentor Graphics Corp.
Systems Design Division
425-301-4425 - Mobile=20
=20
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx=20
> [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Ria R
> Sent: Thursday, December 06, 2007 9:58 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Passivity/Causality
>=20
> Gurus,
> I have heard these 2 terms alot in the world of SI:=20
> Passivity and Causality.
> I tried googling it and I dont seem to get what I am lookimg for.
> Can someone please throw some light on the definitions of=20
> these 2 terms and what significance they have in Signal Integrity?
> Thanks in advance,
> Best Regards,
>=20
> Ria.
>=20
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> =20
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