Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
My question about TRL calibration on R&S ZVC vector analyzer:
1. To choose TRL calibration I need to choose standart type (eg. SMA(f)). Why is it for. TRL calibration is independent on standard you use.
2. When I choose SMA first then TRL calibration the standards of eg. through are specified as SMA-through. So I ask how to define my own TRL calibration standard and how to chose it? I thing I should use "user def" standart. Am I right?
3. In TRL calibration I can do "line" standard twice. Is it to expand freq range?
4. Definding "Line" standard I need to determine electrical lenght of it, but in R&S there is a place to add only physical lenght only. What about velocity factor? There is a place to add velocity factor in "ofset/set dielectric' menu. But I'm not sure if analyzer takes it into acount. Another problem is that I need to do this calibration on FR4 dielectric. So I would have problem to specify Er accurately. Any solution?
5. Now about impedance. When I do TRL calibration I do it for Z0=50 Ohm. How to do calibration for 75 Ohm?
1. ZVM has R&S cal kit in SMA that uses TRL. This is referrered to this kit.
2. Correct
3. Yes. As standard rule with line you can do one octave of cal range, you can extend it using two properly designed lines.
4. There is a menu where you define the substrate parameters. I don't remember exactly where, but you can do it.
Be aware with FR4. If you want to use it, you'd better measure FR4 paramters independently (you should have for example a TRL kit in alumina to cal the VNA and some board to measure lines parameters and Er). FR4 is frequency dependant and may vary from lot to lot.
5. I don't know.
I hope it can help.
Mazz
Ad 4.
I know that FR4 vary a lot rom freq, but up to 2 GHz it should be good enough. I thought about making TRL calibration kit on another substrate, but I afraid that connection between two diferent pcb board couse big measuremed inaccurate. To avoid this I would have to do some special metal stator, but in this moment it is redundant cost.
To do TRL calibration kit I need to know only line parameters (attenuation and Eef). I thing I can measure it doing standart through calibration, which would be done on THROUGH from not done TRL calibration kit. What do you thing abut it?
Ad 5.
CAN ANYBODY TELL ME ABOUT TRL CALIBRATION FOR 75Ohm.
1. I don't know the details. Maybe on R&S home page.
4. In my opinion you can do this way: I think you have SOLT SMA cal kit. Use it to calibrate (full two port) and make some test boards (only transmission line) in FR4 with different lenght and different widths. Measure them and put the measured s parameters on a simulator that has good substrate models (I use @DS). Modify the model of the line (and of the substrate) on the simulator in order to fit the measurements: if you succeed you have a model! that you can use.
You will know substrate parameters.
This is a proven solution up to 3 GHz. Good agreement up to 5 GHz.
Use SMA PCB connectors at edge of PCB, the one that has axis in line with PCB, absolutely no right angles. You can neglet the effect of SMA to Microstrip transition up to 2GHz or make a model also in yuor simulator.
I hope it can help.
Mazz
i also working on the TRL calibratin in ROHDE&SCHWARZ ZVx network analyzer. i have to design my own TRL calibration kit. where can i find the matlab code for TRL calibration? or could anybody help me on the matlab codes? i have to finish this work within this week.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
