RE: [SI-LIST] : SMA launch

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From: Javier Del-Valle-Echavarri (INE) (
Date: Tue Jun 05 2001 - 00:54:16 PDT

Richard, What do you mean with "small delrin washer"?
Thanks a lot,

Javier del Valle


-----Original Message-----
From: []
Sent: lunes 4 de junio de 2001 20:56
Subject: Re: [SI-LIST] : SMA launch

I assume that your SMA is a straight or right angle connector, and not an end
launch connector. I've had good luck in the past with removing the copper
in all of the planes to a point where the copper was tangential to the four
ground pins of the SMA (sorry, but I can't remember the stackup). As I
recall, the connector was still slightly capacitive. I placed a small delrin
washer under the SMA to position it slightly higher. This small added center
pin inductance counteracted the connector capacitance, making a perfect
doublet when viewed with a 20ps TDR.
Richard Ellison, consultant

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