The Basics of the Doherty Amplifier

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  • Author: Bill Slade

This article reviews 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, a computer model of the Doherty amplifier has been constructed 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.