book

Doherty Power Amplifiers

by Bumman Kim

March 2018

Beginner

184 pages

5h 38m

English

Academic Press

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Abstract1.1 Historical Survey1.2 Basic Operation Principle1.3 Offset Line Technique1.4 Other Load Modulation Methods
Abstract2.1 Correction for Lower Current of Peaking Amplifier2.2 Knee Voltage Effect on Doherty Amplifier Operation2.3 Offset Line Design for Compensation of Peaking Amplifier Phase Variation
Abstract3.1 Doherty Amplifier With Asymmetric Vds3.2 Optimized Design of GaN HEMT Doherty Power Amplifier With High Gain and High Efficiency3.3 Optimized Peaking Amplifier Design for Doherty Amplifier3.4 Saturated Doherty Amplifier3.5 Average Power Tracking Operation of Basestation Doherty Amplifier
Abstract4.1 N-Way Doherty Amplifier4.2 Three-Stage Doherty Amplifier
Abstract5.1 Introduction5.2 Design of Linear Doherty Power Amplifier5.3 Compact Design for Handset Application5.4 Implementation and Measurement5.5 Doherty Power Amplifier Based on CMOS Process5.6 Average Power Tracking Operation of the Handset Doherty Amplifier

Content preview from Doherty Power Amplifiers

Chapter Three

Enhancement of Doherty Amplifier

Abstract

Various techniques to enhance the performance of the idealized Doherty amplifier are introduced. The drain bias of the peaking amplifier is applied at a higher voltage than that of the carrier. It can control the peak efficiency back-off point, and the knee effect can be absorbed. The carrier amplifier is matched at the first peak efficiency point. This design method relaxes the mismatch problem of the conventional design at the high-power-generation region. The optimized carrier and peaking amplifier designs are introduced to maximize the power performance. The Doherty amplifier design based on a saturated amplifier is introduced to maximize the efficiency. The average power tracking ...