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Noise simulation with S2P + DAC

Question asked by WSTR on May 17, 2006
I try to simulate an arbitrary passive transfer function in harmonic balance. I created a text file with frequencies and insertion loss. I refer to the file via DAC. I run a harmonic balance sweep versus the input frequency to get the transfer function and the noise figure. The temperature of the S2P_Eqn is set to the ambient temperature. The transfer function is perfect. The noise figure has an offset depending on the insertion loss but is frequency independent.

Any idea? Please let me know.

Thank you Wolfram