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Evaluate S21.
If needed, evaluate S21 in diffential and common modes.
Evaluate mixed-mode s-parameters from conventional s-parameters.
You can this task in ADS's Data Display.
See http://www.home.agilent.com/upload/cmc_upload/All/EPSG084733.pdf
Also see "ADS 2009 > Examples > Knowledge Center Examples > Mixed Mode S-Parameter Basics DDS Template"
Treat poly layer as signal port not ground reference.One way is assigning single ports on each terminal of inductor
and associating ground reference ports defined on poly layer with these single ports.
It is a natural result. Consider equivalent circuit for DUT.I mean differential S parameters of this case should be same as differential S parameters obtained using differential ports;
but unfortunately they are not equal.
Consider that I want to simulate an inductor with a patterned ground shield on poly.Treat poly layer as signal port not ground reference.
It is a natural result. Consider equivalent circuit for DUT.