[SI-LIST] Fw: Question Concerning End Launch SMA connector.

From: "e.sweetman" <e.sweetman@xxxxxxxxx>
To: <gblando@xxxxxxxxxxxx>, "SI-List" <si-list@xxxxxxxxxxxxx>
Date: Tue, 8 Apr 2003 14:16:42 -0700
Gustavo,
Rosenberger makes a very good vertical-launch SMA connector.  It has a small
diameter signal pin [perhaps 0.5 mm] which reduces capacitance to ground and
makes impedance matching easier.  I don't have a part number.  With laminate
circuit boards, I have not had good experiences with edge-launch connectors
unless matching microstrip lines with large microstrip to ground spacing.
Eric Sweetman

----- Original Message -----
From: "Gustavo Blando" <gblando@xxxxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Tuesday, April 08, 2003 12:40 PM
Subject: [SI-LIST] Question Concerning End Launch SMA connector.


>
>
> Hello Si people.
> I need to better understand the proper way to interface to a test
> board with "maybe" end launch SMA connector in order to maintain
> a constant impedance over a very wide frequency rage > 15GHz or so.
> This is for a 2.5GB/s - 3.125GB/s application and I have a lot of
> flexibility
> of how to design the test board.
>
> Here are the questions:
>
> 1. In your experience which is the best connector, (or way of connect)
>    for the interface between board and connector.
>    I am going to be injecting TDR/VNA signals.
>
> 2. The papers I've seen deals with this transition to a
>    micro-strip structure (top layer routing).
>    What about If I want to test a Strip line??
>
> 2.a. Have any of you been able to put one/two vias to transition to
>      an stripline, and then successfully extract one/two vias from
>      the measurement ??. (For Example)
> [CONN] -> Connector
> [VIA]  -> Via
> [uST]  -> u-strip line
> [SST]  -> StripLine
> [SST(Real)] -> Stripline that I want to measure.
> [S] --> S Parameters
> [T] --> T Parameters
>
> Setup on the test board, only used to extract the connection
> setting
>
> ====================================================================
> [CONN]--[uST]--[VIA]--[SST]--[VIA]--[uST]--[CONN]  (Test
> Setup)
>   Extract Sparameters from here ---> [S]
> [S] -> Convert to ---> [T] => [T] = [T(1/2)] * [T(1/2)] =
> [T(1/2)]^2
>
> => [T(1/2)] = sqrt([T])
> (This part I am not sure, since sqrt([T]) will give me two
> results,
> and I won't know which one to pick????)
>
>
> Setup that Includes above structure + the "real" structure
> to measure.
>
> ===============================================================
>
> [CONN]--[uST]--[VIA]--[SST/2][SST(Real)][SST/2]--[VIA]--[uST]--[CONN]
(Test
> Setup)
> Extract Sparameters from there --->[Stotal]
> [Stotal] -> Convert to [Ttotal].
> [T(I want)] = [T(1/2)]^-1 * [Ttotal] * [T(1/2)]^-1
> [T (I want)] --> Convert to [S (I want)]
>
> Is this doable????, Have you done it???.
> Is there a better way to do this?.
>
> Any information, papers, will be greatly appreciated.
> Thanks.
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[SI-LIST] Fw: Question Concerning End Launch SMA connector.

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