[SI-LIST] AW: High-Speed (coax) PCB Connector Transitions -- selection, PCB footprint, and performance
- From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 10 Mar 2009 09:53:39 +0100
Michael,
I second the previous comments about the Molex, Rosenberger and Southwest
connectors. I prefer the Molex, but for edge Launch the Southwest is my choice.
Both are non soldered and thus have a great repeatability. We calculate the
footprint for every stack up in full 3D to get the best transition (usually
+/-2 Ohms).
On comment to the Mini-SMP:
The problem with all "non standard" coax is the calibration. Calsets for 2.4mm
2.94mm 3.5mm... are commonly available and you will find one of those at every
vna. But for Mini-SMP calsets are hard to find. That means you have to do TRL
if you don't want the adapters in your measurement. Given that you stated that
the connectors need to be invisible to the measurement I assume you are not
planning on TRL, thus without a proper calset for Mini-SMP you will also have
the adapters visible in your measurement.
If you are interested in accurately measure the losses of a structure
(especially for low loss structures) I highly recommend to use TRL. Then you
still need good connectors (at least good repeatability), but you are free to
chose which connectors to use.
BR
Gert
--------------------------------------------------------------------------
Absender ist HARTING Electronics GmbH & Co. KG; Sitz der Gesellschaft:
Espelkamp; Registergericht: Bad Oeynhausen; Register-Nr.: HRA 5596; persönlich
haftende Gesellschafterin: HARTING Electronics Management GmbH; Sitz der
Komplementär-GmbH: Espelkamp; Registergericht der Komplementär-GmbH: Bad
Oeynhausen; Register-Nr. der Komplementär-GmbH: HRB 8808; Geschäftsführer:
Torsten Ratzmann
-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
Auftrag von Michael Rodrigues
Gesendet: Montag, 9. März 2009 18:51
An: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] High-Speed (coax) PCB Connector Transitions -- selection,
PCB footprint, and performance
Hello all at SI-List,
I am trying to implement a PCB connector transition board for the purpose of
measuring a structure at up to 20 GHz. I would be interested in using the best
performing coax-to-PCB launch I can find so that it will not contribute losses
to the actual structure losses I am interested in measuring (i.e., it will be
invisible to the measurement, or as much so as possible).
Two questions I have would be:
1) What would be the best connector type for this purpose (i.e.,
interfacing to VNA and high-speed o-scopes for s-parameter, TDR, and TDT
measurements)?
2) How important is the PCB footprint for the connector; what
would be the best way to make sure you are using the best footprint possible
(assuming the case where PCB footprint for a PCB connector are not a
no-brainer)?
Some connectors I have been looking at would include:
2.4 mm (DC to 50 GHz):
* Rosenberger 09K243-40ME3
* Southwest 1493-03A-5
Mini-SMP (DC to 65 GHz):
* Rosenberger 18 S 203- 40M L5
* Rosenberger 18 S 102- 40M L5
Thank you in advance for any replies.
Best regards,
Michael
This email and any attachments are intended for the sole use of the named
recipient(s) and contain(s) confidential information that may be proprietary,
privileged or copyrighted under applicable law. If you are not the intended
recipient, do not read, copy, or forward this email message or any attachments.
Delete this email message and any attachments immediately.
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
- » [SI-LIST] AW: High-Speed (coax) PCB Connector Transitions -- selection, PCB footprint, and performance - Havermann, Gert
