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How to caculate input impedance by differential s-parameter?

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thisisjack

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How to caculate input impedance by differential s-parameter?
 

sigint

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Differential s-parameter? I've been dealing with differential impedance designs for years and almost all of my designs contain differential signals now, and this is a new term for me? Could you explain? You may find what you need in the polar folder on filemanager.

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thisisjack

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I try to use AD8343 @
http://products.analog.com/products/info.asp?product=ad8343

They just give the s-parameter and in the data sheet. the input impedance @50Mhz
is about 2.7 + 6.8i and output is 900 -77i.
I try to find the different input & output impedance @1.9 ~2.5 GHz, but I do not know how to do it? Would you please help me? Thanks in advance.
 

g579

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Thanks for sharing the MTT (PDF)article. Good info.
 

jallem

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Re: How to caculate input impedance by differential s-parame

Differential s-parameter? I've been dealing with differential impedance designs for years and almost all of my designs contain differential signals now, and this is a new term for me? Could you explain? You may find what you need in the polar folder on filemanager.
In reality a more exact term would be "Mixed Mode S-parameters"
There is Ph.D Dissertation about and a couple of IEEE articles about it by
David E. Bockelman. "The Theory, Measurement and Applications of
Mode Specific Scattering Parameters with Multiple Mode of Propagation",
Univeristy of Florida, 1997

Added after 1 minutes:

And Agilent has a VNA model with 4 ports for differential
measurements for about 3 years now.
 

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