From: Wallenhorst, Ulrich (Ulrich.Wallenhorst@HARTING.com)
Date: Wed Jan 03 2001 - 06:02:04 PST
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.
> Ulrich Wallenhorst
> HARTING KGaA
> Dept.: Electronic Connectors Division
> Director of Advanced Interconnection Solutions
> E-Mail: ulrich.wallenhorst@HARTING.com
> Phone: +49 57 72 47-294
Mobile: +49 160 533 6786
> Fax.: +49 57 72 47-471
> Von: Larry Miller[SMTP:firstname.lastname@example.org]
> 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
> Unfortunately, the boards I will be looking at are too thick to use the
> 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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