Type of Document	Master's Thesis
Author	Kunselman, Gary L.
URN	etd-03122009-040933
Title	Radio frequency power amplifiers for portable communication systems
Degree	Master of Science
Department	Electrical Engineering
Advisory Committee	Advisor Name Title Moore, Daniel J. Committee Chair Davis, Willam A. Committee Member Elshabini-Riad, Aicha A. Committee Member
Keywords	Amplifiers Radio frequency
Date of Defense	1992-12-15
Availability	restricted
Abstract Portable communication systems require, in part, high-efficiency radio frequency power amplifiers (RF PA) if battery lifetime is to be conserved. Conventional amplifier classifications and definitions are presented in a unified and concise format. The Bipolar Junction Transistor (BJT) and Metal-Semiconductor Field Effect Transistor (MESFET) are evaluated as active devices in high-efficiency RF PA designs. Two amplifier classes (class CE and class F) meet the system requirements of an 850 MHz operating frequency, a power output of 3 W, a battery supply voltage of 9 Vdc, and a sinusoidal-type signal to be amplified. Both classes are evaluated through recent research literature and simulated using the PSpice® computer simulation program. Class CE and class F are found to provide efficiencies exceeding 80 percent under the given system constraints.
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