Saleh A A M, Cox D C. Improving the power-added efficiency of FET amplifiers operating with varying- envelope signals [J]. IEEE Transactions on Microwave Theory and Techniques, 1983, 31(1): 51-56.
[2]
Hanington G, Chen P, Asbeck P M, et al. High-efficiency power amplifier using dynamic power-supply voltage for CDMA applications [J]. IEEE Transactions on Microwave Theory and Techniques, 1999, 47(8): 1471-1476.
[3]
Shvarts E Y, Triolo A A, Ziesse N G. Variable output power supply [P]. US Patent, Pub. No. US2003/ 0146791A1, Aug. 7, 2003.
Mathe L, Kimball D, Arehambault J, Haley W. Apparatus and method for efficiently amplifying wideband envelope signals [P]. US Patent No. 6300826B1, Oct. 9, 2001.
[6]
Yousefzadeh V, Alarcón E, Maksimović D. Efficiency optimization in linear-assisted switching power converters for envelope tracking in RF power amplifiers[C]. Proceedings of IEEE International Symposium on Circuits and Systems, 2005: 1302- 1305.
[7]
Vasic M, Garcia O, Oliver J A, Alou P, Diaz D, Cobos J A. Multilevel power supply for high efficiency RF amplifier[C]. Proceedings of IEEE Applied Power Electronics Conference, 2009: 1233-1238.
[8]
Yundt G B. Series parallel connected composite amplifiers [T]. Master Thesis. Massachusetts Institute of Technology, 1983.
[9]
Ertl H, Kolar J W, Zach F C. Basic considerations and topologies of switched-mode assisted linear power amplifiers[J]. IEEE Transactions on Industrial Electronics, 1997, 44(1): 116-123.
[10]
Self D. Audio power amplifier design handbook [M]. London (U.K): Butterworth-Heinemann, 2006.
[11]
Nujira energy primer [W]. Available: http:// www. nujira. com.
[12]
Høyerby M C W, Andersen M A E. High-bandwidth, high-efficiency envelope tracking power supply for 40W RF power amplifier using paralleled bandpass current sources [C]. Proceedings of IEEE Power Electronics Specialist Conference, 2005: 2804-2809.
[13]
Markowski P. Power supply providing ultra fast modulation of output voltage [P]. US Patent, Pub. No. US2007/0024360A1, Feb. 1, 2007.
[14]
Yousefzadeh V, Alarcón E, Maksimović D. Three- level buck converter for envelope tracking applications [J]. IEEE Transactions on Power Electronics, 2006, 21(2): 549-552.
[15]
Wilson M P. High efficiency amplification [P]. US Patent, Pub. No. US2006/0028271A1, Feb. 9, 2006.
[16]
Liu X D, Liu S C, Jiang K K. A high efficiency quasi-linear power amplifier based on switch-linear hybrid scheme [J]. Transactions of China Electrote- chnical Society, 2008, 23(9): 98-104.
[17]
Høyerby M C W, Andersen M A E. Envelope tracking power supply with fully controlled 4th order output filter[C]. Proceedings of IEEE Applied Power Electronics Conference, 2006: 993-1000.
[18]
Van der Zee R A R, Van Tuijl A J M. A power- efficient audio amplifier combining switching and linear techniques [J]. IEEE Journal of Solid-state Circuits, 1999, 34(7): 985-991.