Many practicing engineers view RF, especially large-signal RF circuits,
as a somewhat mysterious, "black magic" subject. This book
attempts to show that there is nothing unusual or inexplicable
about RF power amplifiers — understanding them is simply a matter of
understanding several basic principles and their applications. Although
accurate CAD modeling and/or optimization can become almost impossible,
since mathematical modeling of RF power amplifiers is often too difficult or
complex to provide useful practical results, yield design equations, or predict
a circuit's performance, the main purpose of a theoretical approach is
to provide a starting point for computer simulations or experimental
tweaking, or simply a physical understanding of the circuit.