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S21 measurements

Question asked by mpcengineer on Oct 3, 2011
Latest reply on Oct 3, 2011 by Dr_joel

I have built a test fixture and taken s-parameter measurements for a RF transistor we are using.

When I use the sparameters to simulate an evaluation circuit my simulation is out.

Possible errors are:
1) I have used a 0mm thru for transmission calibration?
2) Do I need to adjust the s-parameters for the transit time of the transistor?

Any help on making correct S-Parameter measurements would be greatly appreciated.

I am working at 460MHz.