[SI-LIST] Re: Reference when interconnect is an S-parameter file
- From: Jinghua Huang <Jinghua.Huang@xxxxxxxxxxxx>
- To: fzanella@xxxxxxxxxxxxx
- Date: Fri, 07 Jan 2005 09:59:33 +0800
Hi Fabrizio,
You may just use vss as the reference node for the S element S1, like
S1 txp txn rxp rxn vss mname=s_model
This makes vss the return node for S1 at both driver and receiver end.
Hope this answers your question,
Jinghua
Zanella, Fabrizio wrote:
>I'm using a Touchstone .s4p file (4 port S-parameter) as my channel in a
>backplane serdes simulation in Hspice. There's no ground reference for
>the touchstone file; my simulation deck basically looks like this:
>
>
>Xdriver inp inn vcc vss txp txn tx_model $ plus pre-emphasis settings
>
>S1 txp txn rxp rxn mname=s_model
>
>Xreceiver rxp rxn vcc vss input_model
>
>
>
>My question is does it make sense to keep the same return node, vss, for
>the driver and receiver circuits or should I add in LCR circuitry to
>account for card1-connector-backplane-connector-card2 path it takes?
>
>
>
>Thanks and regards,
>
>Fabrizio Zanella
>
>Signal Integrity
>
>Enterasys Networks
>
>Andover, MA
>
>Phone: 978-684-1340
>
>fzanella@xxxxxxxxxxxxx
>
>
>
>
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