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N5230A Stability measurement differs from ADS

Question asked by ervman1 on Apr 1, 2014
Latest reply on Apr 2, 2014 by ervman1
Hi, I'm trying to measure an amplifier's stability.  I'm using the network analyzer's equation for calculating and showing mu/mu prime.  I'm also saving the s2p file and plotting stability in ADS.  

I'm seeing that the stability differs between the two methods although both should be based on the same s parameter data.  The formula for stability is pretty straightforward so I'm wondering what is different in the network analyzer?  

By the way, the analyzer is saying my amplifier is stable while ADS shows potential instability so I do have a need to clarify what is correct.