Multitone frequency-domain simulation of nonlinear circuits in large- and small-signal regimes

Computer simulation of general microwave nonlinear circuits excited by a la rge number of input tones is addressed. The algorithm, based on the spectra l-balance method, uses novel index-vector and convolution-matrix generation techniques. That, in conjunction with a new nonlinear-device modeling appr oach (which directly takes into account the higher order derivatives of the I/V and Q/V characteristics), allowed the prediction of such complex behav ior as spectral regrowth and noise-power ratio (NPR) tests of a class-B pow er amplifier or multitone intermodulation phenomena in a saturated multioct ave amplifier.