vborich
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The notion of "averaging" as I know it is absent from PAC. PAC computes the solution around all of the large-signal harmonics simultaneously. Roughly, the size of the PAC system is N*S, where N is number of circuit nodes and S is the number of sidebands.
Your 0th harmonic sideband, i.e. the IF component, has contributions from the sidebands of all harmonics at all circuit nodes. The cross-coupling between the sidebands is established by the non-DC F.S. coefficients. The stronger the nonlinearity, the larger the coefficients and the stronger the sideband coupling. In a purely linear circuit, there is no cross-coupling -- linear circuits do not convert frequencies. But PAC still solves the equations simulatenously, it's just that the solution is mathematically equivalent to a sequence of AC simulations at each of the sideband frequencies.
Another good paper is "Nonlinear-linear analysis of resistive mixers" by S. Egami in IEEE Trans MTT, 1974.
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