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We carry out a comparative design study on two high-efficiency power amplifiers (a second-harmonic tuning LD-MOS and a Doherty GaN-based amplifier) linearized through baseband digital predistortion so as to comply with the W-CDMA 3GPP standard with acceptable efficiency. Several predistortion schemes (both memoryless and with memory) were tried, having in mind the final FPGA implementation. The results,...
The paper shows the impact of a base-band predistortion linearization scheme of high efficiency power amplifiers (HPAs) in terms of key parameters such as the adjacent channel power ratio (ACPR) and the average PA efficiency. Two HPAs are compared: an uneven GaN Doherty (DPA) and a 2nd harmonic tuned Si LD-MOS (LPA). The base-band behavioral models of the HPAs are based on the parallel Hammerstein...
Key issues in predistortion and feedforward linearisation solutions for future complex PA systems destined for a wide range of evolving advanced wireless systems are reviewed in this paper. In particular, digital techniques and adaptive schemes are discussed.
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