[SI-LIST] Re: Surface mount SMB
- From: "Loyer, Jeff" <jeff.loyer@xxxxxxxxx>
- To: <martin@xxxxxxxxxxxxxx>, "Si-List" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 14 Nov 2002 07:31:37 -0800
I've had some very good luck with surface mount SMAs, getting a quiet =
launch. It took a bit of ingenuity to make the transition from the =
connector to surface traces clean, but it didn't require sophisticated =
3-D modeling - just intelligent thought. Most notably, the ground plane =
was voided under the center conductor pad so that the pad didn't =
represent a huge capacitance.
I assume the same principles apply to SMB's.
Of course, if you then have to transition to an inner layer, there will =
be a further discontinuity caused by the via. A through-hole device =
would only have the single discontinuity getting to an inner layer.
Jeff Loyer
-----Original Message-----
From: Martin Euredjian [mailto:martin@xxxxxxxxxxxxxx]
Sent: Wednesday, November 13, 2002 10:55 PM
To: Si-List
Subject: [SI-LIST] Surface mount SMB
I have a need to bring a 1.5GHz signal from the back of the enclosure to =
the
serdes chip (6 to 12 inches). I'm thinking of using an assembly =
consisting
of a 75ohm isolated bulkhead mount BNC crimped to Belden 1855A and onto =
a
right angle SMB connector. On the PCB end, I'm not sure if I should go =
with
through hole straight SMB or a surface mount version. My preference is =
for
surface mount but I've never used them. This would be a low
connect/disconnect rate application.
Any horror stories related to surface mount SMB? Are the advantages over
through-hole significant? Layout recommendations?
Also, can anyone recommend a source of good SMB connectors, both to =
crimp
onto a cable and for surface mount application. I found this company
http://www.connectorcity.com/cdocs/f_prod.html but know nothing about =
them.
Thanks,
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D
Martin Euredjian
eCinema Systems, Inc.
voice: 661-305-9320
fax: 661-775-4876
martin@xxxxxxxxxxxxxx
www.ecinemasys.com
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D
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