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Tue, 15 Nov 2005 10:49:50 -0500 |
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Jim
What software are you using to model your coupon? Polar has an online modeling service which uses a field solver and I have found it to be very accurate.
Best regards
Lee
J. Lee Parker, Ph.D.
JLP Consultants LLC
804 779 3389
----- Original Message -----
From: Jim Henderson<mailto:[log in to unmask]>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Tuesday, November 15, 2005 9:28 AM
Subject: [TN] impedance testing
Hello,
If there are any impedance testing gurus out there I have a question for
you. We are testing an edge coupled offset strip line coupon. We modeled
the stack up to give us 100 ohms differential. When we test the coupon we
get around 130 ohms. We have done a microsection of the coupon and modeled
the coupon data and Polar says we should have 105 ohms, within tolerance.
We had a 4 panel lot and it is consistent across the board. The coupon is
constructed correctly. My question is, other than what I am seeing on the
microsection should I look for to find the culprit of the high reading? Any
help would be great.
Jim Henderson
Colonial Circuits
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