Chapter One

Introduction to Doherty Power Amplifier

Abstract

The most important property of the Doherty amplifier is the load modulation, which carries out the perfect combining of the asymmetrical powers from the two amplifiers. Thereby, only one amplifier (called carrier amplifier) operates at a low power level, and the two amplifiers (the second one is called peaking amplifier) generate powers at a higher power level. Also the carrier amplifier operates at the peak efficiency mode, while the peaking amplifier is operational due to the nice load modulation characteristic. Another important characteristic of the Doherty load modulation is that the overall gain of the amplifier is constant, providing a linear amplification. The Doherty circuit ...

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