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This paper presented a unified frequency-domain formulation and algorithm for computing noise in the nonlinear microwave circuits. The method uses stationary components and harmonic power spectral density in its formulation to capture time-varying noise statistics. A description of noise spectrum for the interesting ports in the nonlinear microwave circuits is the central results enabling fast and accurate computation. The method is efficient for large circuits with CAD and can generate information useful for noise macromodels. Finally, the experimental results verify its practicability in the application.