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Spectrasys push pull amplifier simulation

Question asked by PBOLTO on Apr 8, 2008
Latest reply on Apr 9, 2008 by rulonv
I'm trying to simulate a push pull amplifier in Spectrasys to replicate the results I see on the bench in a current design. My problem is that the gain shown in Spectrasys does not match measured results. I would expect to see a gain which is 3 dB higher than the single amp gain, minus the output balun losses. In practice with a pair of 19 dB amplifiers in this configuration I get a gain of 20.7 dB, Spectrasys is showing 18.7 dB. I initially assumed that the problem was caused by the transformer but I now wonder if it is a coherency problem. Does anyone have any experience with this type of model to help with the fault finding?