A CMOS radio-frequency front-end for multi-standard wireless communications

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1853/37250

Title: A CMOS radio-frequency front-end for multi-standard wireless communications
Author: Cha, Jeongwon
Abstract: The explosive growth of wireless communication market has led the development of low-cost, highly-integrated wireless communication systems. Even though most blocks in the front-end have successfully been integrated by using the CMOS technology, it is still a formidable challenge to integrate the entire front-end. Thus, the objective of this research is to demonstrate the feasibility of the integrated front-end by using improved circuit techniques as well as the improved process technologies. This dissertation proposes an improved control scheme to enhance the high-power handling capability of an antenna switch. As a part of this research, an antenna switch controller for a GaAs antenna switch was first developed to enhance the performances of the GaAs antenna switch by using the boosted control voltage. To enhance the efficiency of the front-end, efficiency improvement techniques for the antenna switch controller has also been studied. With the suggested efficiency improvement techniques, a fully-integrated antenna switch was implemented using the SOI technology, and exceeding performances over many commercial products for watt-level high-power applications have been successfully demonstrated. As an effort to improve the efficiency of a power amplifier, a linear envelope detector was also implemented, and the results show that the envelope detector is suitable for dynamic biasing of the power amplifier. The research presented in this dissertation, thus, provides a low-cost and high-performance solution for highly-integrated RF front-end used in various wireless communication systems.
Type: Dissertation
URI: http://hdl.handle.net/1853/37250
Date: 2010-08-26
Publisher: Georgia Institute of Technology
Subject: CMOS circuits
Antenna switch
RF front-end
Metal oxide semiconductors, Complementary
Wireless communication systems
Radio frequency
Department: Electrical and Computer Engineering
Advisor: Committee Chair: Tentzeris, Emmanouil; Committee Member: Kang, Sung Ha; Committee Member: Kim, Jongman; Committee Member: Lee, Chang-Ho; Committee Member: Shen, Shyh-Chiang
Degree: Ph.D.

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