Harmonic Tuning for High Efficiency in Power AmplifiersAndrew Gibson (supervisor: Dr. Ron Johnston)
M.Sc. Thesis, The University of Calgary, September 1992
This investigation is concerned with power amplifiers operating at high frequencies with maximized power added efficiency.
The approaches employed to raise amplifier efficiency are reviewed, followed by the waveforms and harmonic combinations required for harmonic tuning. Significant performance gains may be achieved by the correct use of the second and/or third harmonic voltages on the transistor collector (drain). Next, descriptions of the measurement system, the circuit and the simulation system are presented.
Measured and simulated performance of an unmodified amplifier and the same circuit with second harmonic tuning is given. The theoretical performance gains are proven in both the physical and simulated measurements. Finally, some measured effects of third harmonic tuning and the effects of tuning on amplifier linearity are summarized.
A significant part in this work is that conclusions are drawn from
measurement and simulation of an actual amplifier circuit rather than
from a set of idealized assumptions.
CONTACTS: Ron Johnston, Andrew Gibson
SUBJECTS: RF Circuits and Systems
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