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The nonlinear behavioral models are very important in the linearization of RF power amplifiers. And when establishing model, the memory effect is not neglected. By studying the characteristic of the parallel Wiener model and Saleh model, this paper proposes the Wiener-Saleh model for RF power amplifiers, which exhibit memory effects. The model extraction is performed using two-tone harmonic-balance...
Low power adaptive pre-distortion (APD) techniques are applied to nonlinear RF power amplifiers for mobile devices. An APD system is demonstrated which reduces spectral regrowth products by 10-20 dB and increases modulation accuracy by 2-6X. The use of APD allows a reduction in 3 G PA supply current by 2X and provides immunity to load mismatches as high as 8:1.
In this paper, a novel closed-form expression of the intermodulation distortion (IMD) of nonlinear RF power amplifier (PA) considering input and output frequency responses is proposed. A transmitter including nonlinear PA is modeled with three-box (Wiener-Hammerstein type) model to include input and output frequency responses. To verify the closed-form expression of IMD, the analytical results are...
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