Statistical analysis of spectral regrowth in wireless nonlinear circuits

The output power spectrum of a modulated carrier applied to a nonlinear wireless circuit is analyzed using the statistical properties of the signal and a complex power series behavioral model of the nonlinear circuit. Nonlinear analysis of signals with known statistical moment properties results in reduced order expressions for the output power spectrum in terms of the autocorrelation function of the input signal and the power series coefticients. Comparisons are presented for several limiting amplifier models and between measured versus predicted adjacent channel power rejection (ACPR) values for a microwave amplifier.