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
- Power Amplifier
Date of Defense 2009-11-16 Availability unrestricted AbstractThe 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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