[SI-LIST] Re: Test point modeling in Sigexplorer
- From: "Kai Keskinen" <kalevi@xxxxxxxxxx>
- To: <chris_landrum@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 6 May 2004 19:24:32 -0400
Chris:
Your test point is transmission line stub with a small capacitance at the
end. You can estimate the capacitance from the area of the pad and the
distance to the nearest ground plane using the parallel plate capacitance
equation. You will find that as edge rate goes up, the effect of the test
point increases.
Cheers,
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Landrum, Chris
Sent: Thursday, May 06, 2004 1:55 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Test point modeling in Sigexplorer
Hi all...
How would one model a test point that is connected to a tx-line using the
Cadence SigExplorer or SI-Expert tools? The test point would be say a
0.85mm circular pad that is connected in a short stub configuration off of a
50 ohm tx-line. Should the test point be modeled as a simple capacitor? Or
perhaps it is simply a stub. The purpose of the model would be to examine
the effects of the test point on signal quality.
Thanks.
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