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The Basics Of The Doherty Amplifier
By Bill Slade, Orban Microwave Products
In this article, we will review the behavior of the Class-AB and Class-C amplifiers and then take a detailed look at how these two amplifier types can be combined to produce a system that preserves signal fidelity as well as boosts efficiency. In a 21st century interpretation of the spirit of the 1930s radio-builders, we construct a computer model of the Doherty amplifier to demonstrate how the constituent system blocks work together to produce high DC to RF conversion efficiency at "backed-off" power levels while maintaining the capacity to reproduce signal peaks high above the average signal power level.
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