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Giofr\u00e9, <i>et al<\/i>.: \u201cA design approach to maximize the efficiency vs. linearity trade-off in fixed and modulated load GaN power amplifiers,\u201d IEEE Access <b>6<\/b> (2018) 9247 (DOI: 10.1109\/ACCESS.2018.2807479).","DOI":"10.1109\/ACCESS.2018.2807479"},{"key":"11","doi-asserted-by":"crossref","unstructured":"[11] T. Qi, <i>et al<\/i>.: \u201cCanceling intermodulation products: a high-efficiency and linear-asymmetric Doherty PA,\u201d IEEE Microw. Mag. <b>20<\/b> (2019) 98 (DOI: 10.1109\/MMM.2018.2875613).","DOI":"10.1109\/MMM.2018.2875613"},{"key":"12","doi-asserted-by":"crossref","unstructured":"[12] X. Fang, <i>et al<\/i>.: \u201cLinearity-enhanced Doherty power amplifier using output combining network with predefined AM-PM characteristics,\u201d IEEE Trans. Microw. Theory Techn. <b>67<\/b> (2019) 195 (DOI: 10.1109\/TMTT.2018.2870830).","DOI":"10.1109\/TMTT.2018.2870830"},{"key":"13","doi-asserted-by":"crossref","unstructured":"[13] M.N.A. 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