Title page for ETD etd-11302009-203601


Type of Document Master's Thesis
Author Fayed, Khaled Abdelaziz
Author's Email Address
URN etd-11302009-203601
Title The Design of Linearized Power Amplifier for Wireless Communications
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Zaghloul, Amir I. Committee Chair
Ezzeddine, Amin Committee Member
Sedki M. Riad Committee Member
William A. Davis Committee Member
Keywords
  • Linearization
  • Power Amplifier
  • Predistortion
  • Intermodulation
Date of Defense 2009-11-16
Availability unrestricted
Abstract
The interest in higher data rate systems is rising very quickly in the area of wireless

communications. High data rates mean high Peak to Average Ratio, PAR. This imposes

big challenge on the linearity requirement of Power Amplifiers, PAs. The simplest

technique that has been used is backing off the PA. However, this leads to very

inefficient performance. A lot of more complex techniques were suggested in the

literatures to trick the tradeoff between linearity and efficiency. So we discuss the

advantages and disadvantages of those techniques. In addition we suggest a new

technique called Power Amplifier Linearization using a Mirror Predistorter. This

technique is based on the use of a mirror PA that generates a copy of the main PA nonlinearity, and then feeds it in the proper phase and magnitude into the input in order to cancel the intermodulation terms at the output. Simulation and on the bench lab results validate the suggested technique. Also a hybrid PA module was designed and tested based on the suggested technique, and showed an improvement of 23 dB in the Third Order Intermodulation to Carrier ratio, IMD3 of the PA at 7.5 dB back off.

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