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Differential Measurement with Baluns - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


mbergmann
 Post subject: Differential measurement with baluns
Posted: Tue Jun 17, 2008 5:55 pm 
 
Captain

Joined: Mon Jun 19, 2006 10:27 am
Posts: 13
Hello,

I have to make measurements on differential devices with a network analyzer, for which I purchased two Baluns from Minicircuits (ZFSCJ-2-1, SMA).
How do I have to carry out the calibration on the VNA ?
open is open
short is simply a connection between the two inner conductors of the two outputs of each balun ?
match would be a 50 Ohm resistor mounted on each output or do I have do connect the two inner conductors with each other with a 100 Ohm resistor between them ?

Frequency range is 1 MHz - 500 MHz.

P.S.: Please don`t tell me that measurements with baluns are a piece of !"§$%&(/%$?, I talked about this topic with my boss, but we just have got an old VNA and we don`t have got the money for a new one with differential capabilities.

P.P.S.: I also know that there doesn`t exist anything like a `real` calibration standard for differential measurements, but I talked about this with my boss and ... you know the rest of the story, don`t you ?


 
   
 
FSomma
 Post subject: Re: Differential measurement with baluns
Posted: Wed Jun 18, 2008 5:05 pm 
Actually...
open is open
short is short
and load is the characteristic impedance of your VNA


 
  
 
gui076
 Post subject:
Posted: Fri Jul 25, 2008 7:02 am 
 
Captain

Joined: Mon May 05, 2008 9:56 am
Posts: 17
Location: France
Hi all,

My question is pratically the same.
I would like to measure a differential Low-Pass filter with a VNA.

I have seen some subjects with S parameters transformations or something like that but i have not found procedures on how use the VNA for this measures.

Does anyone have an idea ?

guillaume


 
   
 
nccu1990
 Post subject:
Posted: Sun Aug 10, 2008 10:05 am 
 
Lieutenant

Joined: Sun Jul 27, 2008 10:29 am
Posts: 1
You can read the R&S application note

1EZ53: Measuring Balanced Components with Vector Network Analyzer ZVB

http://www2.rohde-schwarz.com/en/produc ... |-904.html

More important one is you must define the correct differential impedance in the port configuration of VNA.

gui076 wrote:
Hi all,

My question is pratically the same.
I would like to measure a differential Low-Pass filter with a VNA.

I have seen some subjects with S parameters transformations or something like that but i have not found procedures on how use the VNA for this measures.

Does anyone have an idea ?

guillaume


 
   
 
mac
 Post subject:
Posted: Tue Dec 16, 2008 4:24 am 
 
Captain
User avatar

Joined: Fri Nov 02, 2007 3:45 am
Posts: 10
Location: germany
Hi,
just a simple coment -
don't know if it helps but
think about it

can't you use two baluns of the same kind,
measure them back to back and calibrate them into your
network analyzer setup -
now connect your filter or whatever in between and measure your response etc.

mac

_________________
regards
mac




Posted  11/12/2012

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