Trl over solt calibration

[abhijitrc]

What is the advantage of TRL calibration over SOLT calibration

 

[tony_lth]

why do you think so? I prefer SOLT calibration.

 

[johnjoe]

With TRL calibration you can take the testbench much easier into account.

 

[abhijitrc]

what is the difference between de-embedding and in-fixture calibration ?Usable bandwidth of a single line is 8:1,actually what it means ? suppose we want our calibration kit to work for the frequency range of 2-15GHz, how many lines we have to introduce ?? Plz guide.

 

[Mazz]

De-embedding is a post processing of measurement data, that can happen, in modern VNAs, during the measurement. If you know the S-paramenter of the network that is in between the DUT and the calibration plane, you can remove it mathematically using deembedding.

TRL is a real calibration used when you have to measure non insertable devices (such as RFICs). You canuse a single line for 2-15GHz. There is a lot of info in Agilent web pages. An old but very useful application note is the one made for 8510 VNA, I've found a copy here: http://emlab.uiuc.edu/ece451/appnotes/TRL_2.pdf

If you're going to make your own TRL cal kit, I recommend to add some verification line, for example a 30 Ohm impedance line, to check if the cal kit works as expected.

I hope it helps.

Mazz

 

[abhijitrc]

Hi MAZZ,

Thanks for the application note.

Since THRU determines the reference plane, What is the role of LINE standards in TRL calibration ?and why in the application notes it is lambda/4 relative to THRU standard? ? Kindly guide me