[SI-LIST] Re: High-Speed (coax) PCB Connector Transitions -- selection, PCB footprint, and performance

From: "QU Perry" <Perry.Qu@xxxxxxxxxxxxxxxxxx>
To: "Michael Rodrigues" <michael.rodrigues@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
Date: Tue, 10 Mar 2009 11:35:33 -0500

We used Molex surface contact SMAs for our TDR launch and have
reasonable performance. There are some published papers from Molex and
also one from Tektronix/Teraspeed on launch optimization and we used
that as reference. 3D full wave EM simulation with
optimization/parameterization is a must if you want to maximize
bandwidth.

Regards

Perry

======================================= 

Perry Qu 

IPD Design & Qualification, Alcatel-Lucent Canada Inc.

600 March Road, Ottawa ON, K2K 2E6, Canada 

DID: 613-7846720  Fax: 613-5993642 

Email: perry.qu@xxxxxxxxxxxxxxxxxx 

======================================= 


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Michael Rodrigues
Sent: Monday, March 09, 2009 1:51 PM
To: si-list@xxxxxxxxxxxxx
Subject: [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



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References:
- [SI-LIST] High-Speed (coax) PCB Connector Transitions -- selection, PCB footprint, and performance
  - From: Michael Rodrigues

[SI-LIST] Re: High-Speed (coax) PCB Connector Transitions -- selection, PCB footprint, and performance

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