[SI-LIST] Re: Question Concerning End Launch SMA connector.
- From: "Gary Otonari" <garyo@xxxxxxxxxxxx>
- To: <gblando@xxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 8 Apr 2003 15:39:22 -0700
Gustavo,
Another way to interface to a DUT is by avoiding the connectors altogether
and using microprobes. Advantages: lots of BW, low parasitics, flexible
for interfacing to many different DUTs. Disadvantages: you really need a
probe station to do the probing, probes are fragile and expensive.
If you'd like more info, contact me.....
-- Gary Otonari
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Gustavo Blando
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.
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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