[SI-LIST] Re: Finding the impedance of a PCB trace
- From: "Jian X. Zheng" <jian@xxxxxxxxxx>
- To: <doug@xxxxxxxxxx>, <GrahamDavies@xxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 2 May 2005 10:53:21 -0700
Hi, Graham:
I tried it on both of our simulators:
Full-Wave EM Simualtor IE3D and Formula Based LineGauge. LineGauge predicts
the Zc = 47.3 ohms while IE3D predicts frequency dependent Zc as follows:
Freq (GHz) IE3D_Zc
1 49.7
5 49.3
10 49.1
15 48.9
20 48.6
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Jian X. Zheng, Ph.D., Zeland Software, Inc.
48834 Kato Road, 103A, Fremont, CA 94538, U.S.A.
Tel: 510-623-7162, Fax: 510-623-7135
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Doug Brooks
Sent: Monday, May 02, 2005 9:21 AM
To: GrahamDavies@xxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Finding the impedance of a PCB trace
As an added reference, the new Polar Quicksolver gives Zo for these
dimensions as 47.38 Ohms
The new UltraCAD differential calculator (single ended calculations are
free) does not allow a value for H less than 4 mils, BUT, you can scale
everything up by a factor of two (check this out with the Polar calculator,
you get the same result) and when you do that the UltraCAD calculator gives
a value for Zo of 48.5 Ohms. The new UltraCAD calculator will also do
differential calculations, but a license is required.
Doug Brooks
At 02:28 PM 4/29/2005, Graham Davies wrote:
>This is, of course, related to my search for a good 6-layer stackup.
>
>What is the impedance of a PCB trace (microstrip) with the following
>parameters:
>Width ......................... 6.00 mil
>Height above return plane ..... 3.20 mil
>Thickness ..................... 1.35 mil (1 ounce copper)
>Dielectric rel. permittivity .. 4.2
>
>These are the answers I get from various tools:
>
>41... ohms (http://www.icd.com.au/)
>41.69 ohms (http://www.emclab.umr.edu/pcbtlc/microstrip.html)
>41.69 ohms (TraceSim version 1.0.0)
>41.69 ohms (http://www.technick.net/public/code/cp_dpage.php?
>aiocp_dp=util_pcb_imp_calculator)
>41.7 .ohms (http://www.sunmantechnology.com/resources/cal_cat00.shtml)
>46.14 ohms (ZTOOL Impedance Calculator V1.2)
>47.31 ohms (http://www.rogers-corp.com/mwu/mwi_java/mwij_vp.html)
>50.89 ohms (http://www.csgnetwork.com/boardrunimpcalc.html)
>51.27 ohms (TxLine version 1.1)
>
>Does anyone have an idea as to why these calculators give results
>that vary by 20% and which are more reliable?
>
>Graham.
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