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Small-Signal HB Simulation issues

Question asked by MESFET98 on Sep 20, 2006
Hi All, I am runing a Small Signal Harmonic Balance simulation on an amplifier. I am injecting a small signal current source into a node in the circuit. When I run the simulation, I sweep the small signal frequency and I do not sweep the large signal. When I look at the dataset for the current and voltage at that node, I see that the current value of the current source changes indexes after the small signal frequency reaches fc/2 (fc being the large signal frequency); the same thing happens to the voltage. That is giving me issues trying to plot the current and voltage and to continue doing algebraic manipulations on them. Why does it jump?

below is an example:

see link

Any ideas?