Ken Kundert
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Conceptually both Harmonic Balance (HB) and Shooting Methods (SM) only require the existence of a steady-state solution, and this circuit would have a steady-state solution. So there is no reason why HB would not work on this circuit. Having said that, there are differences in the ability of HB and SM to converge on strongly nonlinear circuits. In general HB will have more trouble than SM. However, you are not having convergence problems. The error messages you are seeing are all innocuous.
One thing you should assure before you go too far is that your circuit actually works as you expected. One reason why you are seeing a low voltage is simply because that is the voltage your circuit would produce. Transient analysis could be a good sanity check.
One possible reason why HB would not give accurate results is because you did not specify enough harmonics to be solved for. The temptation for this is great. Intuition generally leads you to specify too few harmonics, and if you increase the number of harmonics the simulation becomes very expensive. Particularly with a three tone simulation. You might try reducing the number of tones and increasing the number of harmonics.
-Ken
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