[SI-LIST] AW: TRL Calibration Question
- From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 5 Dec 2013 08:34:35 +0000
Hi Johnny,
Answer 1) What will create more reflections: LOAD or OPEN? You should use the
one with mor reflections if the reflect is measured
Answer 2) You need different lengths of thru to cover a greater frequency
range. The measurement per line is only valid within a 180° phase change (due
to the fact that phase is directly related to length, but the phase keeps
repeating itself while the length increases endlessly. That's why you have to
be inside the 180° range to have meaningful results)
Answer 3) You should check the Source match using an Airline. Also a sanity
check with measuring a straigt line and check if the phase has any
discontinuities. Attach a Load and check the reflection noise floor level.
B.T.W.: no regular SMA will give you 30GHz Bandwidth. Most SMAs end at 18GHz,
there are some available up to 26GHz. For everything above that there are other
coax connectors available (e.g. K, 2.92mm)
BR
Gert
----------------------------------------
Absender ist HARTING Electronics GmbH, Marienwerderstraße 3, D-32339 Espelkamp;
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
Auftrag von Yejun Fu
Gesendet: Donnerstag, 5. Dezember 2013 02:14
An: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] TRL Calibration Question
Hi All:
I have this calibration board, has an OPEN(80mils), THUR(160mils),
LOAD, 3 different lines(1,2,3), 1x line, 2x line, calibration verification
line . The calibration board also gives info of delay for trace of load,
line1, line2, line3, I believe it covers from DC to 30GHz, (SMA connectors).
This calibration board is used to evaluate a high speed connector(DUT), which
has a two paddle card with a 80 mils transmission line on header and receptacle
side. So my DUT structure is SMA+80mils
trace+high speed connector+80 mils trace+SMA.
My understand is this is a TRL calibration board to put my reference plane to
the pins of high speed connector. My VNA has an option called multi-section
TRL, which ask me to do the Reflection, Thur, line (3 different line) only.
I have three questions:
1. For VNA's reflection option, which trace on the calibration board should I
use, I mean OPEN or LOAD?
2. Why we need line 1 line2 line3 three different lines for TRL?
3. How to check my calibration accuracy?
Thanks
Johnny
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