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.

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I try to use AD8343 @
http://products.analog.com/products/...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.

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

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

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