Wideband Power Amplifier Modeling Incorporating Carrier Frequency Dependent AM/AM and AM/PM Characteristics
نویسنده
چکیده
In this article, we present a complex baseband model for a wideband power amplifier that incorporates carrier frequency dependent amplitude modulation (AM) and phase modulation (PM) (i.e., AM/AM and AM/PM) characteristics in the design process. The structure used to implement the amplifier model is a Wiener system which accounts for memory effects caused by the frequency selective nature of the amplifier, in addition to the nonlinearities caused by gain compression and saturation. By utilizing piecewise polynomial nonlinearities in the structure, it is shown how to construct the Wiener model to exactly accommodate all given AM/AM and AM/PM measurement constraints. Simulation results using data from a 50 W 32-way Ka-band solid state power amplifier (SSPA) are provided, highlighting the differences in degradation incurred for a wideband input signal as compared with a narrowband input.
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