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Nguyen, <i>et al.<\/i>: \u201cA 28-GHz symmetrical Doherty power amplifier using stacked-FET cells,\u201d IEEE Trans. Microw. Theory Techn. <b>66<\/b> (2018) 2628 (DOI: 10.1109\/TMTT.2018.2816024).","DOI":"10.1109\/TMTT.2018.2816024"},{"key":"22","doi-asserted-by":"crossref","unstructured":"[22] G. Nikandish, <i>et al.<\/i>: \u201cBreaking the bandwidth limit: a review of broadband Doherty power amplifier design for 5G,\u201d IEEE Microw. Mag. <b>21<\/b> (2020) 57 (DOI: 10.1109\/MMM.2019.2963607).","DOI":"10.1109\/MMM.2019.2963607"},{"key":"23","doi-asserted-by":"crossref","unstructured":"[23] W. Shi, <i>et al.<\/i>: \u201cDesign and analysis of continuous-mode Doherty power amplifier with second harmonic control,\u201d IEEE Trans. Circuits Syst. II, Exp. Briefs <b>68<\/b> (2021) 2247 (DOI: 10.1109\/TCSII.2021.3051734).","DOI":"10.1109\/TCSII.2021.3051734"},{"key":"24","doi-asserted-by":"crossref","unstructured":"[24] D. Wang, <i>et al.<\/i>: \u201cA 24-29.5GHz voltage-combined Doherty power amplifier based on compact low-loss combiner,\u201d IEEE Trans. Circuits Syst. II, Exp. Briefs <b>68<\/b> (2021) 2342 (DOI: 10.1109\/TCSII.2021.3053309).","DOI":"10.1109\/TCSII.2021.3053309"},{"key":"25","doi-asserted-by":"crossref","unstructured":"[25] S. Hu, <i>et al.<\/i>: \u201cA 28-\/37-\/39-GHz linear Doherty power amplifier in silicon for 5G applications,\u201d IEEE J. Solid-State Circuits <b>54<\/b> (2019) 1586 (DOI: 10.1109\/JSSC.2019.2902307).","DOI":"10.1109\/JSSC.2019.2902307"},{"key":"26","doi-asserted-by":"crossref","unstructured":"[26] E. Kaymaksut, <i>et al.<\/i>: \u201cTransformer-based Doherty power amplifiers for mm-wave applications in 40-nm CMOS,\u201d IEEE Trans. Microw. Theory Techn. <b>63<\/b> (2015) 1186 (DOI: 10.1109\/TMTT.2015.2409255).","DOI":"10.1109\/TMTT.2015.2409255"},{"key":"27","doi-asserted-by":"crossref","unstructured":"[27] P. Indirayanti and P. 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