8.6 Class 
RF Power Amplifier with Second Harmonic
A circuit of the Class F RF power amplifier with a second-harmonic peaking, called the 
, is shown in Fig. 8.24. Figure 8.25 shows the voltage and current waveforms for this amplifier. The gate-to-source voltage waveform is rectangular.
Figure 8.24 Class 
power amplifier: (a) circuit and (b) equivalent circuit.
Figure 8.25 Waveforms in the Class 
RF power amplifier.
8.6.1 Fourier Series of Rectangular Drain Current Waveform
The drain current waveform is a rectangular wave given by
8.265 
The rectangular drain current can be expanded into Fourier series
8.266 
where
8.267
8.268
and
8.269
Figure 8.26 shows Fourier coefficients as ...
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