[SI-LIST] Re: SMA connectors
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: whizplayer@xxxxxxxxx
- Date: Thu, 06 Jun 2002 09:43:08 -0700
Bob,
Molex also has a nifty top launch surface mount SMA that has incredible
characteristics. I've used them for card launches quite successfully.
With a little magic supplied by Dave Dunham of Molex you can achieve
near zero impedance discontinuity at the launch and bandwidths of 18
GHz. They're perfect for test card applications.
Best regards,
Scott
--
Scott McMorrow
Teraspeed Consulting Group LLC
2926 SE Yamhill St.
Portland, OR 97214
(503) 239-5536
http://www.teraspeed.com
Bob Patel wrote:
>Hi!
>A while back there were posts on SMA connectors being
>used and how to minmize the discontinuity and there
>were couple of suggestions.
>I recently worked with a design and used different SMA
>connectors with different center pin diameter.
>The SMA connector with 0.3mm i.e. 12mil(costly) is
>very good and is made by Rosenberger but when using
>this connector don't remove the non-functional pads
>around the center pin & try to keep the antipad
>diameter samll. THis is because the thin center pin is
>inductive & need to add C to compensate it. I removed
>C and ended up with SMA too inductive.
>The regular SMA connector with 1.27mm pin is
>okay(cheap)and here you remove the non-functional pads
>on the center pin and increase the antipad size. This
>helped me as I gained 10ohms by using this approach.
>Bob
>
>
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