[SI-LIST] Re: s parameter causality problems
- From: Megan Pecheny <Megan.Pecheny@xxxxxxxxxxxxxx>
- To: Cristian Gozzi <cristian.gozzi@xxxxxxxxx>
- Date: Tue, 6 Dec 2011 12:20:34 -0600
Thank you everyone!!
From: Cristian Gozzi [mailto:cristian.gozzi@xxxxxxxxx]
Sent: Tuesday, December 06, 2011 11:57 AM
To: Megan Pecheny
Cc: si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] s parameter causality problems
Dear Megan
it's a common problem when it's used a simulator to extract S-parameters
without using frequency dependent materials.
If they use frequency dependent material for dielectric, like Djorckevic Sarkar
or Debye model, and run another time simulation, they can provide you casual
s-param model
Regards
Cris
2011/12/6 Megan Pecheny
<Megan.Pecheny@xxxxxxxxxxxxxx<mailto:Megan.Pecheny@xxxxxxxxxxxxxx>>
I received 2 16port connector models and am using Hyperlynx 8.1.1 Touchstone
Viewer to do some analysis. Both models I received from this company report as
being non-causal. I have watched many of eric bogatin's webinars and searched
for information regarding the quality of s parameters and can't really find
anything pertaining to causality and passivity. I know a true system is causal
because you can't have a response without a stimulus, but does this mean the s
parameter model is flawed and shouldn't be trusted?
Any advice is greatly appreciated!
Thank you,
Megan Pecheny
Daktronics
Hardware Design Engineer
605-692-0200 ext. 57043<tel:605-692-0200%20ext.%2057043>
Megan.Pecheny@xxxxxxxxxxxxxx<mailto:Megan.Pecheny@xxxxxxxxxxxxxx>
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