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Baseband effects result in asymmetrical distortion of RF communication signals through the interaction of baseband-related distortion with in-channel distortion. Here, a behavioral model architecture that captures these asymmetries and can be implemented in a variety of circuit and system simulators is presented. The architecture has two or more slices with each slice corresponding to different frequency bands or multiple parallel nonlinear processes. Each slice could comprise any conventional narrow-band functional model. Here, the behavioral model is extracted using AM-AM and AM-PM measurements for the first slice and phase and amplitude measurement of intermodulation components for the second slice.