Millimeter-Wave Power Amplifiers by Jaco du Preez & Saurabh Sinha

Author:Jaco du Preez & Saurabh Sinha
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

5.2.3.1 Theory of Operation

The circuit diagram in Fig. 5.7 showed the simplest form of Class E amplifier, where the output network consists of a series RL combination and the switch is shunted by a capacitor. The notation of voltage and current signals used in the succeeding analysis is shown in Fig. 5.11.

Fig. 5.11Class E amplifier circuit

For the purposes of analysis, the switch is assumed to be ideal, which means that state transition times and turn-on resistances are negligibly small, and that the switch can change state at any point in the RF cycle [2]. It may be assumed that the periodic drive signal causing the switch to toggle on and off resonates close to the resonant frequency of the circuit, which would result in a sinusoidal current signal flowing through the resonant circuit loop. This is quite similar to the tuned load amplifier discussed in the preceding section.

From Fig. 5.11, the current flowing into the switch-capacitor combination can be written as

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