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Wang, Envelope Tracking Power Amplifiers for Wireless Communications, Artech House, 2014."},{"key":"2","doi-asserted-by":"publisher","unstructured":"[2] S. Tanaka, \u201cProgress of the Linear RF Power Amplifier for Mobile Phones,\u201d IEICE Trans. Fundamentals, vol.E101-A, no.2, pp.385-395, Feb. 2018. 10.1587\/transfun.e101.a.385","DOI":"10.1587\/transfun.E101.A.385"},{"key":"3","doi-asserted-by":"publisher","unstructured":"[3] K. Mukai, H. Okabe, and S. Tanaka, \u201cRecent progress in envelope tracking power amplifier for mobile handset systems,\u201d IEICE Trans. Electron., vol.E104-C, no.11, pp.516-525, Oct. 2021. 10.1587\/transele.2021mmi0005","DOI":"10.1587\/transele.2021MMI0005"},{"key":"4","doi-asserted-by":"crossref","unstructured":"[4] I. Yoshida, M. Katsueda, M. Morikawa, Y. Matsunaga, T. Fujioka, M. Hotta, Y. Nunogawa, K. Kobayashi, S. Shimuzu, and M.Nagata, \u201cA 3.6 V, 4W 0.2cc Si power-MOS-amplifier module for GSM handset phones,\u201d IEEE ISSCC, pp.50-51, Feb. 1998. 10.1109\/isscc.1998.672371","DOI":"10.1109\/ISSCC.1998.672371"},{"key":"5","unstructured":"[5] T. Shimizu, Y. Nunogawa, T. Furuya, S. Yamada, I. Yoshida, and M. Hotta, \u201cA small GSM power amplifier module using Si-LDMOS driver MMIC,\u201d IEEE ISSCC, 10.8, Feb. 2004. 10.1109\/isscc.2004.1332661"},{"key":"6","doi-asserted-by":"crossref","unstructured":"[6] T. Shimizu, Y. Matsunaga, S. Sakurai, I. Yoshida, and M. Hotta, \u201cA single-chip Si-LDMOS power amplifier for GSM,\u201d IEEE ISSCC, pp.310-311, Feb. 2005. 10.1109\/isscc.2005.1493993","DOI":"10.1109\/ISSCC.2005.1493993"},{"key":"7","doi-asserted-by":"crossref","unstructured":"[7] H. Asano, S. Hara, and S. 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Weller, \u201cDC boosting effect of active bias circuits and its optimization for class-AB InGaP-GaAs HBT power amplifiers,\u201d IEEE Trans. Microw. Theory Techn., vol.52, no.5, pp.1455-1463, May 2004. 10.1109\/tmtt.2004.827021","DOI":"10.1109\/TMTT.2004.827021"},{"key":"11","doi-asserted-by":"publisher","unstructured":"[11] T. Yoshimatsu, M. Akagi, N. Tanba, and S. Hara, \u201cAn HBT MMIC power amplifier with an integrated diode linearizer for low-voltage portable phone applications,\u201d IEEE J. Solid-State Circuits, vol.33, no.9, pp.1290-1296, Sept. 1998. 10.1109\/4.711326","DOI":"10.1109\/4.711326"},{"key":"12","doi-asserted-by":"publisher","unstructured":"[12] K. Nellis and P.J. Zampardi, \u201cA comparison of linear handset power amplifiers in different bipolar technologies,\u201d IEEE J. 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Firoiu, \u201cPolar loop transmitter for GSM\/GPRS\/EDGE,\u201d IEEE RFIC Symp., pp.13-16, June 2005. 10.1109\/rfic.2005.1489173","DOI":"10.1109\/RFIC.2005.1489173"},{"key":"16","doi-asserted-by":"crossref","unstructured":"[16] Y. Akamine, S. Tanaka, M. Kawabe, T. Okazaki, Y. Shima, M. Yamamoto, R. Takano, and Y. Kimura, \u201cA polar loop transmitter with digital interface including a loop-bandwidth calibration system,\u201d IEEE ISSCC, pp.348-349, Feb. 2007. 10.1109\/isscc.2007.373437","DOI":"10.1109\/ISSCC.2007.373437"},{"key":"17","doi-asserted-by":"crossref","unstructured":"[17] A.W. Hietala, \u201cA quad-band 8PSK\/GMSK polar transceiver,\u201d IEEE RFIC Symp., pp.9-12, June 2005. 10.1109\/rfic.2005.1489171","DOI":"10.1109\/JSSC.2006.872742"},{"key":"18","doi-asserted-by":"publisher","unstructured":"[18] D. Kang, D. Yu, K. Min, K. Han, J. Choi, D. Kim, B. Jin, M. Jun, and B. 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Matsumoto, \u201cSwitch-less-impedance-matching type W-CDMA power amplifier with improved efficiency and linearity under low power operation,\u201d IEEE IMS, pp.665-668, June 2005. 10.1109\/mwsym.2005.1516693","DOI":"10.1109\/MWSYM.2005.1516693"},{"key":"34","doi-asserted-by":"publisher","unstructured":"[34] G. Hau, T.B. Nishimura, and N. Iwata, \u201cHigh efficiency, wide dynamic range variable gain and power amplifier MMICs for wideband CDMA handsets,\u201d IEEE Microw. Compon. Lett., vol.11, no.1, pp.13-15, Jan. 2001. 10.1109\/7260.905953","DOI":"10.1109\/7260.905953"},{"key":"35","doi-asserted-by":"crossref","unstructured":"[35] M. Miyashita, T. Okuda, H. Kurusu, S. Shimamura, S. Konishi, J. Udomoto, R. Matsushita, Y. Sasaki, S. Suzuki, T. Miura, M. Komaru, and K. Yamamoto, \u201cFully Integrated GaAs HBT MMIC Power Amplifier Modules for 2.5\/3.5-GHz-Band WiMAX Applications,\u201d IEEE Compound Semiconductor Integrated Circuit Symp., pp.1-4, Nov. 2007. 10.1109\/csics07.2007.50","DOI":"10.1109\/CSICS07.2007.50"},{"key":"36","unstructured":"[36] K. Mukai, S. Shinjo, K. Yamanaka, M. Miyashita, and K.Yamamoto, \u201cA dual-gain-mode high efficiency power amplifier for W-CDMA data communications,\u201d APMC, pp.671-673, Nov. 2014."},{"key":"37","doi-asserted-by":"publisher","unstructured":"[37] N.G. Constantin, P.J. Zampardi, and M. El-Gamal, \u201cAutomatic Hardware Reconfiguration for Current Reduction at Low Power in RFIC Pas,\u201d IEEE Trans. Microw. Theory Techn., vol.59, no.6, pp.1560-1570, June 2011. 10.1109\/tmtt.2011.2116038","DOI":"10.1109\/TMTT.2011.2116038"},{"key":"38","doi-asserted-by":"crossref","unstructured":"[38] M. Hassan, C. Olson, D. Kovac, J.J. Yan, D. Nobbe, D. Kelly, P.M. Asbeck, and L.E. Larson, \u201cAn envelope-tracking CMOS-SOS power amplifier with 50% overall PAE and 29.3 dBm output power for LTE applications,\u201d IEEE, CSICS, pp.14-17, Oct. 2012. 10.1109\/csics.2012.6340110","DOI":"10.1109\/CSICS.2012.6340110"},{"key":"39","doi-asserted-by":"crossref","unstructured":"[39] K. Watanabe, S. Tanaka, M. Hase, Y. Honda, Y. Tanaka, and S. Arayashiki, \u201cAC-Stacked Power Amplifier for APT\/ET LTE HPUE Applications,\u201d IEEE BCICTS, pp.283-286, Oct. 2018. 10.1109\/bcicts.2018.8551064","DOI":"10.1109\/BCICTS.2018.8551064"},{"key":"40","doi-asserted-by":"crossref","unstructured":"[40] J. Enomoto, T. Terashima, M. Itou, K. Watanabe, Y. Tanaka, S. Tanaka, and S. Arayashiki, \u201cAC-stacked power amplifier for 5G mobile handset applications in Band n77,\u201d IEEE RFIT, WE4C, Sept. 2020. 10.1109\/rfit49453.2020.9226179","DOI":"10.1109\/RFIT49453.2020.9226179"},{"key":"41","doi-asserted-by":"publisher","unstructured":"[41] S. Kang, M.-S. Jeon, and J. 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