Design of Highly Efficient Wideband RF Polar Transmitters Using the Envelope-Tracking Technique
Yan Li; Chia-Chang Chuang; Tzu-Yin Yang; Chen, K.; Gin-Kou Ma; Lopez, J.; Popp, J.D.; Lie, D.Y.C.; Wu, S.
Solid-State Circuits, IEEE Journal of
Volume 44, Issue 9, Sept. 2009 Page(s):2276 - 2294
Digital Object Identifier   10.1109/JSSC.2009.2022669
Summary:This paper discusses the design issues of highly efficient and monolithic wideband RF polar transmitters, especially the ones that use the envelope-tracking (ET) technique. Besides first reviewing the current state-of-the-art polar transmitters in the literature, three focus topics will be discussed: 1) the system-on-a-chip (SoC) design considerations of the monolithic polar transmitter using ET versus EER (envelope elimination and restoration); 2) the design of highly efficient envelope amplifier capable of achieving the high efficiency, current, bandwidth, accuracy and noise specifications required for wideband signals; and 3) the design of high-efficiency monolithic Si-based class E power amplifiers (PAs) suitable for ET-based RF polar transmitters. A design prototype of a polar transmitter using ET and a monolithic SiGe PA that passed the stringent low-band EDGE (Enhanced Data rates for GSM Evolution) transmit mask with 45% overall transmitter system efficiency will be given; the simulated data of the entire polar transmitter system is also compared against the measurement. Further investigations on how to solve the technical challenges to successfully implement linear and high-efficiency ET-based polar transmitter for broadband wireless applications such as WiBro/WiMAX are also discussed.

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