RE: [SI-LIST] : SMA test connector PCB layout

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From: Larry Miller (ldmiller@rhapsodynetworks.com)
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: owner-si-list@silab.eng.sun.com
[mailto:owner-si-list@silab.eng.sun.com]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: ulrich.wallenhorst@HARTING.com
  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:ldmiller@rhapsodynetworks.com]
    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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