NDLI: An improved method of power control with CMOS class-E power amplifiers

Content Provider	IEEE Xplore Digital Library
Author	Tongqiang Gao Chun Zhang Baoyong Chi Zhihua Wang
Copyright Year	2008
Description	Author affiliation: Dept. of Electron. Eng., Tsinghua Univ., Beijing (Tongqiang Gao)
Abstract	In this paper, an improved method of power control is introduced to widen the range of output power with high efficiency. Two CMOS class-E power amplifiers (PA) with different output power are adopted in the design. In order to eliminate the phase mismatch of two paths, a continuously adjustable CMOS phase shifter with a predictable phase transfer function is added before each PA. Meanwhile, the drain modulation technique is presented to vary the voltage supply of the amplification unit. With the combination of drain modulation and parallel amplification, a wider range of output power is obtained than the previous one. The amplifiers work in 915 MHz with the supply voltage of 1.8 V and 2.5 V. Simulation results show that the amplification unit could reach a maximum output power of 26 dBm and maintain a power- added efficiency (PAE) higher than 40% over the 18 dBm- 26 dBm output power range.
Starting Page	2306
Ending Page	2309
File Size	139853
Page Count	4
File Format	PDF
ISBN	9781424416837
DOI	10.1109/ISCAS.2008.4541915
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power control Power amplifiers Power generation Voltage Pulse amplifiers High power amplifiers Phase shifters Radiofrequency amplifiers Pulse modulation Power transmission lines
Content Type	Text
Resource Type	Article

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