[SI-LIST] AW: AW: TRL Calibration Question
- From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 5 Dec 2013 15:08:43 +0000
Hi Johnny,
In most VNAs you have to create a calibration Standard for each TRL, and most
VNAs support as many lines as needed for their Bandwidth, i.e. if your VNA only
supports 3GHz it is unlikely to support >4 Line Standard.
You should look for an application note of the instrument to find out how to
define a cal. Standard. In some instruments this is very unhandy and you have
to write .mdf files including all TRL data at the correct position. Other VNA's
come with a TRL whizzard.
BR
Gert
----------------------------------------
Absender ist HARTING Electronics GmbH, Marienwerderstraße 3, D-32339 Espelkamp;
Registergericht: Amtsgericht Bad Oeynhausen; Register-Nr.: HRB 8808;
Vertretungsberechtige Geschäftsführer: Dipl.-Kfm. Edgar-Peter Düning,
Dipl.-Ing. Torsten Ratzmann, Dipl.-Wirtschaftsing. Ralf Martin Klein
-----Ursprüngliche Nachricht-----
Von: FU, Yejun [mailto:yfu@xxxxxxxxx]
Gesendet: Donnerstag, 5. Dezember 2013 15:45
An: Havermann, Gert
Cc: si-list@xxxxxxxxxxxxx
Betreff: RE: [SI-LIST] AW: TRL Calibration Question
Hello Gert:
No doubt about the reflection, I will check the LOAD impedance. For
the second one, the problem is this VNA only have three line option for
lines(1,2,3) but actually the calibration provide four info of Delay line 1,
line 2, line3 , and Load. I believe that the load is used to provide DC to a
low frequency response. My third question, they provide a calibration line at
this board, I wasn't sure how to check it, I will try it by checking the phase
continuities. For the SMAs, I know its won't support 30GHZ. But their put the
this range on their board, my results also shows that it's done a good job I
mean as good as 2.92mm, but I don't the reason.
Best Regard,
Johnny
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Havermann, Gert
Sent: Thursday, December 05, 2013 3:35 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] AW: TRL Calibration Question
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;
Registergericht: Amtsgericht Bad Oeynhausen; Register-Nr.: HRB 8808;
Vertretungsberechtige Geschäftsführer: Dipl.-Kfm. Edgar-Peter Düning,
Dipl.-Ing. Torsten Ratzmann, Dipl.-Wirtschaftsing. Ralf Martin Klein
-----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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