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Differential measurement with baluns - RF Cafe Forums
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| mbergmann
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Post subject: Differential measurement with baluns
Posted: Tue Jun 17, 2008 5:55 pm
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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 ?
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FSomma |
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Post subject: Re: Differential measurement with baluns
Posted: Wed Jun 18, 2008 5:05 pm
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Actually... open is open short is short
and load is the characteristic impedance of
your VNA
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gui076 |
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Post subject:
Posted: Fri Jul 25, 2008 7:02 am
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Joined: Mon May 05, 2008
9:56 am Posts: 17 Location: France
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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
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nccu1990 |
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Post subject:
Posted: Sun Aug 10, 2008 10:05 am
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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
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mac |
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Post subject:
Posted: Tue Dec 16, 2008 4:24 am
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| Captain |
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Joined: Fri Nov 02, 2007
3:45 am Posts: 10 Location: germany
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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
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Posted 11/12/2012
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