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s-parameter - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


guest
Post subject: s-parameter
Unread postPosted: Sun Jun 19, 2005 11:00 am

hi everyone,
my problem is really simple. I have to measure S11 in a component soldered in a PCB for a frequency range between 1.1 GHz to 1.3 GHz. In this pcb there are two input tracks for the inouts of the component and luckily there are also two identic tracks with open and short termination at theand of them. my question is what's the procedure to get the right S11? Or otherwise what's the procedure to move the reference plane od the vector analyzer?

thanks


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Guest
Post subject:
Unread postPosted: Mon Jun 20, 2005 5:15 am

Does not anyone want to help me :'( ?

Guest


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Guest
Post subject:
Unread postPosted: Mon Jun 20, 2005 6:47 am

The accurate way to measure the S11 of your component is as follows: You have to de-embedd the length of transmission line that leads to the device input. In order to do that, you have to calibrate your VNA as close as possible to the device.Solder an SMA connector to your PCB. Solder a 0-ohm resistor between the input of the device to GND (at the end of the transmission line that leads to the device's input), and calibrate your VNA in "Short", do the same with 50-ohm "Load" termination, and with open-circuit "Open". By that you will eliminate the length of the transmission line, as you take it into account when calibrating the VNA including that piece of transmission line. Now you can measure the real S11 of the device, with a single port. Make sure that the output of the device is terminated with 50-ohm, and of course measure the S11 when the device is powered (with its supply voltage) or else your result won't show the real impedance of the device.


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Phineas
Post subject:
Unread postPosted: Tue Jun 21, 2005 11:26 am

Since you have to de-embed the component, why not get
a similar comonent that hasn't been placed onto a PCB
and measure the S11 parameter?


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Guest
Post subject:
Unread postPosted: Tue Jun 21, 2005 2:10 pm

Phineas wrote:
Since you have to de-embed the component, why not get
a similar comonent that hasn't been placed onto a PCB
and measure the S11 parameter?


What do you mean?
My idea is this, I calibrate my VNA and then I measure the short presents on the boards and I get the s parameter of the board. I measure the componet with the board and I de- embed the s parameter?? What do you think about it??

guest


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Guest
Post subject: De-embedding
Unread postPosted: Tue Jun 21, 2005 2:35 pm

I recommend care. Normally, an accurate de-embedding requires at least open, short, and terminated measurements.

See the Agilent application notes on the subject.

Good Luck!


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Guest
Post subject: Re: De-embedding
Unread postPosted: Tue Jun 21, 2005 2:55 pm

Guest wrote:
I recommend care. Normally, an accurate de-embedding requires at least open, short, and terminated measurements.

See the Agilent application notes on the subject.

Good Luck!


I didn't find anything on the agilet's website... anyway I'll check out once again...and thanks everyone

Guest


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Guest
Post subject: Agilent app not on vector analyzer de-embedding
Unread postPosted: Wed Jun 22, 2005 1:23 pm

Hmm - it's gotten harder to find stuff on Agilent's website.

I think this is what you need:
http://cp.literature.agilent.com/litweb ... -5329E.pdf

Good Luck!


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Guest
Post subject: Re: Agilent app not on vector analyzer de-embedding
Unread postPosted: Thu Jun 23, 2005 1:48 am

Guest wrote:
Hmm - it's gotten harder to find stuff on Agilent's website.

I think this is what you need:
http://cp.literature.agilent.com/litweb ... -5329E.pdf

Good Luck!



thanks a lot...you are extremely kind :-)

Guest



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