8.3 Class F35 RF Power Amplifier with Third and Fifth Harmonics
8.3.1 Maximally Flat Class F35 Amplifier
The circuit of a Class F RF power amplifier with both third and fifth harmonics is called the Class amplifier and is depicted in Fig. 8.15. The voltage and current waveforms are shown in Fig. 8.16. The drain-to-source voltage waveform is
8.141
The third-harmonic voltage waveform is out phase with respect to the fundamental voltage, and the fifth-harmonic voltage waveform is in phase with respect to the fundamental voltage. Thus, from Fig. 3.7, the conduction angle of the drain current of the Class should be in the following range:
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amplifier and is depicted in Fig. 8.15. The voltage and current waveforms are shown in Fig. 8.16. The drain-to-source voltage waveform is
out phase with respect to the fundamental voltage, and the fifth-harmonic voltage waveform is in phase with respect to the fundamental voltage. Thus, from Fig. 3.7, the conduction angle of the drain current of the Class 
should be in the following range:
, 
, and 
.