As a result, the 12.5 Ω originally seen by I1 becomes 25 Ω. That effect can be seen in the simulation of a class-A push-pull amplifier in SPICE as follows. Figure 3 This class-A push-pull amplifier ...

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The defining principle of Class A operation is that all of an amplifier’s output devices must be conducting through the full 360 degree cycle of a waveform. Class A can also be broken down into single ...

Push-pull was efficient and powerful, but it was not the end of the game for efficiency. The Doherty amplifier didn’t need a transformer and boasted an efficiency advance over push-pull circuits.