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Xiong, <i>et al.<\/i>: \u201cA highly-applicable supply modulator with a highly-linear envelope detector for WCDMA envelope-tracking applications,\u201d IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP) (2016) 1 (DOI: 10.1109\/IMWS-AMP.2016.7588463)."},{"key":"2","unstructured":"[2] S. C. Cripps: <i>RF Power Amplifiers for Wireless Communications<\/i> (Artech House, London, 2006) 2nd ed. 309."},{"key":"3","unstructured":"[3] F. Wang, <i>et al.<\/i>: \u201cEnvelope tracking power amplifier with pre-distortion linearization for wlan 802.11g,\u201d 2004 IEEE International Microwave Symposium Digest (IMS) (2004) 1543 (DOI: 10.1109\/MWSYM.2004.1338872)."},{"key":"4","unstructured":"[4] C. Hsia, <i>et al.<\/i>: \u201cWideband high efficiency digitally-assisted envelope amplifier with dual switching stages for radio base-station envelope tracking power amplifiers,\u201d IEEE International Microwave Symposium (IMS) (2010) 672 (DOI: 10.1109\/MWSYM.2010.5517569)."},{"key":"5","doi-asserted-by":"publisher","unstructured":"[5] P. Y. Wu and P. K. T. Mok: \u201cA two-phase switching hybrid supply modulator for RF power amplifiers with 9% efficiency improvement,\u201d IEEE J. Solid-State Circuits <b>45<\/b> (2010) 2543 (DOI: 10.1109\/JSSC.2010.2076510).","DOI":"10.1109\/JSSC.2010.2076510"},{"key":"6","doi-asserted-by":"publisher","unstructured":"[6] D. Kim, <i>et al.<\/i>: \u201cHighly efficient dual-switch hybrid switching supply modulator for envelope tracking power amplifier,\u201d IEEE Microw. Wireless Compon. Lett. <b>22<\/b> (2012) 285 (DOI: 10.1109\/LMWC.2012.2197382).","DOI":"10.1109\/LMWC.2012.2197382"},{"key":"7","unstructured":"[7] M. 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