[SI-LIST] Re: On the effect of solder mask on Zo

  • From: "Abe Riazi" <ariazi@xxxxxxxxxxxxxxx>
  • To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
  • Date: Fri, 13 Feb 2004 10:14:21 -0800

Dear Charles and others

In a column by Dr. Eric Bogatin ( "When Accuracy Counts" Printed Circuit
Design & Manufacture", May 2003, P. 36 ), it is stated that Zo decreases by
about one Ohm per one mil of soldermask thickness.


Abe Riazi

-----Original Message-----
From:   Grasso, Charles [SMTP:Charles.Grasso@xxxxxxxxxxxx]
Sent:   Friday, February 13, 2004 7:49 AM
To:     'si-list@xxxxxxxxxxxxx'
Subject:        [SI-LIST] On the effect of solder mask on Zo

Its about 3ohms per mil. The upper limit is 7mils at this point the
soldermask is essentially infinite. Quite significant I would think.

Source : Verifying the accuracy of 2S solvers on Zo Calculation - Dr Eric

Slides available from the GigaTest website : http://www.gigatest.com


Best Regards
Charles Grasso
Senior Compliance Engineer
Echostar Communications Corp.
Tel:  303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Email: charles.grasso@xxxxxxxxxxxx; <mailto:charles.grasso@xxxxxxxxxxxx;
Email Alternate: chasgrasso@xxxxxxxx <mailto:chasgrasso@xxxxxxxx> 


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