[SI-LIST] Re: Question on Differential S parameters
- From: steve weir <weirsi@xxxxxxxxxx>
- To: "Grasso, Charles" <Charles.Grasso@xxxxxxxxxxxx>
- Date: Mon, 04 Apr 2011 14:39:04 -0700
Charles, the Agilent VNA's perform a set of single-ended S Parameter
measurements and then perform matrix transformations to derive the
mixed-mode values algebraically. BTW, you will make your life a bit
easier if in your test set-ups you adopt Agilent's default port
convention of:
P1 <=> P2
P3 <=> P4
Best Regards,
Steve.
On 4/4/2011 1:20 PM, Grasso, Charles wrote:
> Hello all,
> I have a question on how the SDD and SCD series of measurements are made.
> Never having actually
> performed these measurements I did a bit of reading and am unclear on the
> process. What I understand is
> (at least from one manufacturer of test equipment) that the 4 x 4
> single-ended S-parameters (S11 to S44)
> are measured. A built-in function then converts them to the mixed mode
> S-parameters.
>
> My question: For SDD11 are the trace pairs driven with a differential signal
> (in the software?).
> By the same token for the SDC measurements are the traces driven with a
> common signal?
>
> Thanks!
> Best Regards
> Charles Grasso
> Compliance Engineer
> Echostar Communications
> (w) 303-706-5467
> (c) 303-204-2974
> (t) 3032042974@xxxxxxxxx<mailto:3032042974@xxxxxxxxx>
> (e) charles.grasso@xxxxxxxxxxxx<mailto:charles.grasso@xxxxxxxxxxxx>
> (e2) chasgrasso@xxxxxxxxx<mailto:chasgrasso@xxxxxxxxx>
>
>
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--
Steve Weir
IPBLOX, LLC
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