The paper presents a frequency-dependent nonlinear envelope model, Sandwich Envelope Model, which can be easily used in the multiptone intermodulation simulation of microwave power amplifier in communication systems. The identification algorithm of the model's Volterra kernels is also thoroughly discussed. Since the model includes the memory functions of input and output match networks, it is inherently more accurate than the memory-less nonlinear envelope model in broad-band system simulation. Further more, the employment of envelope model makes it more efficient in simulation comparing with the normal Sandwich Instantaneous Model.
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