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differential s-parameters with noise

Question asked by CYBERPHOX on Nov 6, 2007
Hi all,

I have some s-parameter data with noise parameters taken from a simulation in Cadence and want to use these in a data item such as a S2P_diff.

Basically this is a differential input LNA with a single-end output. When simulated the input terminating port is connected to the rfinp and rfinm (differentially) and the output is connected between ground and output.

I have then used the s-parameter and noise data in an S2P_diff model, which is connected with an input termination between p1+ and p1- and the output termination on P2+ and ground P2-. But the results look wrong.

If I used a standard S2P with ground it looks more sensible, however I really need this in differential

Please can some one help me out

Cheers,
Marino  

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