Doherty amplifier

Introduction

Measurement-aided Doherty amplifier design

Targeting those responsible for Doherty Amplifier development, this document summarizes some of the technical challenges, limitations, implementations, and introduces a design methodology that enables maximized cost-performance to be achieved. The following chapters (overview and links provided below) describe significant improvements in Doherty performance by addressing the input side. Allowing to extract and to understand this performance a measurement-aided methodology provides a more detailed and rigorous insight and enables a shorter time-to-market and better cost-specification...

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Chapters

Doherty amplifier Background & Challenges

Background & Challenges

The primary motivation for using a Doherty amplifier…

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Doherty amplifier starting point realization

Doherty Implementations

Aguably, the most common (and often quickest) starting point…

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Doherty amplifier variants

Zeroth Embodiment Variants

The following are variations on the basic concept…

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Measurement-aided design flow

Measurement-aided design flow

Properly understanding any engineering concept…

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Dual-Input Measurement Setup

Dual-Input Measurement Setup

The basic test-setup compromises and SMW200A…

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Doherty schematics

Case Study - Method

This case study uses a state-of-the-art GaN Doherty…

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Linear Analysis

Case Study - Linear Analysis

Plots of two important parameters (efficiency…

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 Non-Linear Analysis

Case Study - Non-Linear Analysis

The post-processing of non-linear results can…

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Microwave components

Conclusions

Significant improvements in Doherty performance…

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Ask the expert

Gareth Lloyd

Gareth Lloyd

Gareth Lloyd graduated from the University of Leeds in 1994 with a degree in Electronic & Electrical Engineering. Gareth has worked in various engineering and management roles, in different industries, for major companies including Ericsson, Huawei, ZTE, TriQuint and Andrew Corporation. Gareth joined Rohde & Schwarz in 2015, as a Senior Expert. His primary work focus is performance differentiated radio front-ends (RFFE).

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Related chapters and information

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