Title page for ETD etd-03122009-040933


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 PSpiceĀ® 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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