From: Larry Miller ([email protected])
Date: Wed Jan 03 2001 - 06:44:15 PST
AW: [SI-LIST] : SMA test connector PCB layoutThanks!
I did indeed visit the Rosenberg site as suggested by Dan Swanson, and they
have edge-mount stripline launchers. Now I gotta see if any of them will fit
my board...
I will visit your site as well
Larry Miller
-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Wallenhorst, Ulrich
Sent: Wednesday, January 03, 2001 6:02 AM
To: 'Si-List (E-mail)'
Subject: AW: [SI-LIST] : SMA test connector PCB layout
Larry,
I recommend to avoid any plated through-hole SMA-launcher. The thicker the
boards the more critical the degrading capacitive effects will be with not
real chance to compensate with tricks like counter drilling or higher
inductive trace-impedance in mm-distance from the signal-pad. You can indeed
use SMA edge-connectors. You have to use the version with only 2 ground pins
and solder it properly on the boards and guarantee a very low inductive path
by e.g. using self-build metal-blocks. If this option is not suitable for
Your application the remaining alternative are low-capacitance probe tips.
Best regards
Ulrich Wallenhorst
HARTING KGaA
Dept.: Electronic Connectors Division
Director of Advanced Interconnection Solutions
E-Mail: [email protected]
http://www.HARTING.com
Phone: +49 57 72 47-294
Mobile: +49 160 533 6786
Fax.: +49 57 72 47-471
----------
Von: Larry Miller[SMTP:[email protected]]
Antwort an: Larry Miller
Gesendet: Mittwoch, 3. Januar 2001 14:38
An: Si-List (E-mail)
Betreff: [SI-LIST] : SMA test connector PCB layout
I need to make some measurements on PC boards up to 5 GHz using a
network
analyzer. In the past I didn't care that much because I was doing TDR
measurements.
Unfortunately, the boards I will be looking at are too thick to use the
"SMA
edge connector" trick.
Does anyone have a pointer to a good PCB footprint that will not have
impedance discontinuities. The connector I want to mount is the familiar
center pin + 4 ground pins vertical SMA style.
Thanks in advance for any help,
Larry Miller
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