[SI-LIST] Re: How to use s-parameter generated from specctra-quest in








Farooq,

If you extracted 4-port S-parameters, and if your differential input is
applied to ports 1 and 2 (3 and 4 are ouput ports) then make sure that
S13 and S24 (and their symmetrical twins S31, S42) are large enough -
ideally close to 1 at low frequency if there is no series capacitors),
while the rest start from relatively small values.

With input output pairs numbered as (1,3) and (2,4), you will have to
check the magnitudes of S12 and S34 instead.

In case of 2-port extrastion, the 'large' values at low frequency are
expected for S12/S21.

Please also take in mind that magnitude itself does not mean validity of
the data: it still can be non-causal and fail in Spice simulation. You
need to verify that the polar plot shows clockwise rotation.

If you have difficulty to do that and if you think your S-parameters do
not contain IQ, send them to me so I can evaluate them.

Vladimir



-----Original Message-----
From: "Farooq Bhatti" <fbhatti@xxxxxxxxxxxxxxxx>
Subject: [SI-LIST] Re: How to use s-parameter generated from
specctra-quest in=20
Date: Wed, 18 Jun 2008 17:56:29 -0700

First thing that we checked.
Then we had the Cadence support generate it for us to be sure.

Sincerely,
Farooq Bhatti
Whizz Systems Inc.
408-980-0400 x 105
408-482-2315 (cell)
NOTICE: This email message is for the sole use of the intended =3D
recipient(s) and may contain confidential and
privileged information. Any unauthorized review, use, disclosure or =3D
distribution is prohibited. If you are not the intended recipient,
please contact the sender by reply email and destroy =3D all copies of =
the
original message.

-----Original Message-----
From: Istvan Novak [mailto:istvan.novak@xxxxxxxxxxx]=3D20
Sent: Wednesday, June 18, 2008 5:43 PM
To: Farooq Bhatti
Cc: si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] How to use s-parameter generated from =3D
specctra-quest in HSPICE

Farooq,

First I would check the port assignment (port numbering) to make =
sure=3D20
that the diff pair is hooked up the same way in the HSPICE =
simulation=3D20
that was assumed in S-parameter extraction.

Regards,
Istvan


Farooq Bhatti wrote:
> Hi All:
>
> I am facing issues with the s-parameter file generated from =3D
spectra-quest for interconnects for one diff pair to
be
> used for PCIe Gen2 simulation in HSPICE. I am getting the entire =3D
signal reflected back from the point where
> s-parameter starts.=3D20
>
> I am using spectra-quest to extract the routed nets in sigxp then =3D
generate the s-parameter from sigxp.
> Then using that s-parameter in HSPICE net list to do the simulation.=20
> Has any one come across same or similar issues? OR know of the correct

> =3D
procedure to do this?
> Thanks in advance.
>
> Sincerely,
> Farooq Bhatti
> Whizz Systems Inc.
> 408-980-0400 x 105
> 408-482-2315 (cell)
> NOTICE: This email message is for the sole use of the intended =3D
recipient(s) and may contain confidential and
> privileged information. Any unauthorized review, use, disclosure or =
=3D
distribution is prohibited. If you are not the
> intended recipient, please contact the sender by reply email and =3D
destroy all copies of the original message.
>
>
>  =3D20


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