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

Sorry - I gave you a SMP instead of SMA  For SMA try  92 SK 50 02
Edge Launch             Huber & Suhner

Justin=20

-----Original Message-----
From: Gustavo Blando [mailto:gblando@xxxxxxxxxxxx]=20
Sent: Tuesday, April 08, 2003 12:41 PM
To: si-list@xxxxxxxxxxxxx
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.=20
   I am going to be injecting TDR/VNA signals.
  =20
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
=09
=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=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=3D=3D=3D=3D=3D=3D
                [CONN]--[uST]--[VIA]--[SST]--[VIA]--[uST]--[CONN]  (Test
Setup)
                Extract Sparameters from here ---> [S]
                [S] -> Convert to ---> [T] =3D> [T] =3D [T(1/2)] * [T(1/2)]
=3D
[T(1/2)]^2

                =3D> [T(1/2)] =3D 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????)

                        =09
                Setup that Includes above structure + the "real"
structure
to measure.
=09
=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=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=3D
=09
[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)] =3D [T(1/2)]^-1 * [Ttotal] * [T(1/2)]^-1
                [T (I want)] --> Convert to [S (I want)]
        =09
                Is this doable????, Have you done it???.        =09
                Is there a better way to do this?.

Any information, papers, will be greatly appreciated.
Thanks.
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