RF Power Amplifier, 2nd Edition

Appendix D

Trigonometric Fourier Series

A periodic function satisfies the condition

D.1

or

D.2

where is the fundamental frequency of function , is the period of function , is an integer, and .

Any nonsinusoidal periodic function can be expressed as an infinite sum of sinusoidal and cosinusoidal functions. The trigonometric Fourier series of a periodic function is given by

D.3

where the Fourier ...