[hpsdr] Atlas Impedance Measurements

[Gerd Loch]

Hi Phil,

 

I already had known these measurements but I cannot find the layer stackup
for these boards which is essential for impedances of the bus lines
(striplines). 

Impedance controlled multilayer boards require a defined layer stackup which
specifies besides the trace widths the thicknesses of copper and insulation
layers within the stackup and a definition for the material which influences
the dielectric constant. As a standard material I presume that FR4 was used.


Probably it is as it is?

 

73, Gerd

DJ8AY

 

 

 

 

-----Original Message-----
From: Phil Harman [mailto:phil at pharman.org] 
Sent: Saturday, September 13, 2008 12:25 PM
To: g.loch at nt-electronics.de; hpsdr at lists.hpsdr.org
Subject: Re: [hpsdr] Atlas Impedance Measurements

 

Hi Gerd,

 

There are some test results by Ray Anderson WB6TBU in SVN that characterise
the Atlas bus. Look at the

end of this document 

 

\trunk\Atlas\ATLAS_Docu_USLetterLowRes.pdf

 

73's Phil....VK6APH 

----- Original Message ----- 

From: Gerd Loch <mailto:g.loch at nt-electronics.de>  

To: hpsdr at lists.hpsdr.org 

Sent: Saturday, September 13, 2008 5:22 PM

Subject: [hpsdr] Atlas Impedance Measurements

 

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which layer stackup was used for the boards for which the impedance and TDR
measurements were made?

I could not find any specification.

I ask this question because I found signal integrity issues on the
clocklines. 

 

73, Gerd

DJ8AY

 


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