Quote: "Since your VNA probe connectors are usually of SMA type you'll also
need at least a pair of SMA-miniSMP adapters which are quite expensive."
They are especially expensive when they are Phase matched, and that’s required
for accurate De-embedding.
BR
Gert
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Ihsan Erdin
Sent: Wednesday, October 12, 2016 4:33 PM
To: hakim.sellaoui@xxxxxxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Input Matching for SMA Connectors
Hakim,
Forget SMA; they're too bulky for most PCB applications discussed here. In the
past, I had a similar concern and used mini-SMP from Rosenberger (but there are
other sources, too) Those tiny connectors are good for up to 65GHz and won't
take up much space on a PCB. Still, you'll need to flare up diff. traces where
they need to be routed to the connectors.
Since your VNA probe connectors are usually of SMA type you'll also need at
least a pair of SMA-miniSMP adapters which are quite expensive.
Regards.
Ihsan Erdin
On Tue, Oct 11, 2016 at 7:25 AM, Hakim Sellaoui <
hakim.sellaoui@xxxxxxxxxxxxxxx> wrote:
Hi all,
I'm designing a test board that will have differential trace widths of
4 mil and I want to connect SMA connectors to them, but I'm not sure
what connector would be suitable as the ones I've found have connector
widths that are neither equal to or smaller than the trace widths, as
well as the recommended pad sizes are much larger. For an RF design I
did at Uni, I just added a quarter wave transformer to provide the
matching at the operating frequency; is it still possible to do this
with a high-speed design with a 200 ps rise time (5 GHz) signal?
Or can anyone recommended a way to connect VNA coaxial cables to a PCB
with trace widths around 4 mils, such that the Zo is maintained.
Thanks,
--
Hakim Sellaoui
Associate Hardware Engineer
DisplayLink (UK) Limited
Tel: +44 (0)1223 443920
Fax: +44 (0)1223 443921
E:
hakim.sellaoui@xxxxxxxxxxxxxxx<mailto:hakim.sellaoui@xxxxxxxxxxxxxxx>
W: http://www.displaylink.com/
140 Science Park, Milton Road,
Cambridge, CB4 0GF,
United Kingdom.
Registered in England No. 04811048
DisplayLink Corp.
A US incorporated company.
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