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TRL self-calibration algorithm   Message List  
Reply | Forward Message #25 of 29 |
Re: TRL self-calibration algorithm

Hello Dylan

Looks like you replied to my message but the text did not show?

Regards
Igor

--- In mtt-11@yahoogroups.com, Dylan Williams <dylan@...> wrote:
>
> At 07:46 AM 7/22/2008, you wrote:
>
> >Hello
> >
> >I've been following Doug Rytting presentation called "TRL
> >Calibration". The equations all make sense and give good results
> >however the presentation does not seem complete as it does not discuss
> >how to do the final step of separating e10e32 and e23e01 terms (these
> >terms are the S12's and S21's of the two error adapters).
> >
> >Can anybody help me with this? I'd like to determine the S-parameters
> >of the two error adapters.
> >
> >Thank you
> >Igor
> >
> >
>
>
>
> -----------------------------------------------------
> Dylan Williams <dylan@...>
> NIST 818.01 <dylan@...>
> 325 Broadway [+1] (303)497-3138 (TEL)
> Boulder CO 80305 USA [+1] (303)497-3970 (FAX)
> http://www.boulder.nist.gov/dylan/
> -----------------------------------------------------
>





Tue Jul 22, 2008 9:54 pm

igorlinetsky
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Message #25 of 29 |
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Hello I've been following Doug Rytting presentation called "TRL Calibration". The equations all make sense and give good results however the presentation does...
igorlinetsky
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Jul 22, 2008
1:58 pm

... Dylan Williams <dylan@...> NIST 818.01 <dylan@...> 325 Broadway [+1] (303)497-3138 (TEL) ...
Dylan Williams
dylanmtt
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Jul 22, 2008
8:53 pm

Hello Dylan Looks like you replied to my message but the text did not show? Regards Igor...
igorlinetsky
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Jul 22, 2008
9:59 pm

Sorry Igor, When de-embedding adapters you can use reciprocity (S21=S12) to solve this problem. Both MultiCal and StatistiCAL allow you to solve for adapter...
Dylan Williams
dylanmtt
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Jul 23, 2008
2:49 am

Thank you Dylan When S21=S12 there is a 180deg ambiguity in the answer because of the square root function. Similarly, there is a square root to solve for S22...
igorlinetsky
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Jul 30, 2008
5:29 pm

Actually knowing the type of the reflect standard corrects the S22 phase. Igor ... Dylan...
igorlinetsky
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Jul 30, 2008
9:11 pm

Hello Igor, In MultiCal and StatistiCAL you put in an estimate for the length of the fixture. The programs use this estimate at the lowest frequency to resolve...
Dylan Williams
dylanmtt
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Jul 30, 2008
9:13 pm
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