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Asbeck and Z. Popovic: \u201cET comes of age: envelope tracking for higher efficiency power amplifiers,\u201d IEEE Microw. Mag. <b>17<\/b> (2016) 16 (DOI: 10.1109\/MMM.2015.2505699)."},{"key":"2","unstructured":"[2] D. Kimball, <i>et al.<\/i>: \u201cHigh efficiency envelope tracking power amplifiers for wide modulation bandwidth signals (invited),\u201d Asia-Pacific Microwave Conference (APMC) (2014) 103."},{"key":"3","unstructured":"[3] B. Kim, <i>et al.<\/i>: \u201cPush the envelope: design concepts for envelope tracking power amplifiers,\u201d IEEE Microw. Mag. <b>14<\/b> (2013) 68 (DOI: 10.1109\/MMM.2013.2240851)."},{"key":"4","unstructured":"[4] X. Liu, <i>et al.<\/i>: \u201cA 2.4V 23.9dBm 35.7%-PAE 32.1dBc-ACLR LTE-20MHz envelope-shaping-and-tracking system with a multiloop-controlled AC-coupling supply modulator and a mode-switching PA,\u201d ISSCC Dig. Tech. Papers (2017) 38 (DOI: 10.1109\/ISSCC.2017.7870249)."},{"key":"5","unstructured":"[5] J. 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