NDLI: Efficiency of Doherty RF Power-Amplifier Systems

Content Provider	IEEE Xplore Digital Library
Author	Raab, F.H.
Copyright Year	1963
Abstract	A Doherty system combines the outputs of two or more linear RF power amplifiers (PAs) through an impedance-inverting coupler such as a quarter-wave transmission line. At low output levels, the first PA operates linearly, reaching saturation (and maximum efficiency) at some transition voltage below the system peak-output voltage. At higher output levels, the first PA remains saturated and the second PA operates linearly. The instantaneous efficiency and power characteristics of a Doherty system are derived using ideal class-B RF PAs so that the results can easily be scaled for use with real-world PAs. The average efficiency and maximum-efficiency transition points are then determined for a variety of amplitude-modulated signals. The Doherty amplifier can be considerably more efficient than a conventional class-B linear PA. For example, the 28-and 8.9-percent average efficiencies of a class-B PA with Rayleigh-distri buted envelopes with 10-and 20-dB peak-to-average ratios are improved to 60 and 48 percent, respectively, by a two-stage Doherty system. The addition of a third stage further improves the efficiencies to 70 and 66 percent, respectively.
Sponsorship	IEEE Broadcast Technology Society
Starting Page	77
Ending Page	83
Page Count	7
File Size	945359
File Format	PDF
ISSN	00189316
Volume Number	BC-33
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1987-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio frequency Voltage Radiofrequency amplifiers Impedance Couplings Power amplifiers Transmitters Pulse modulation Transmission lines Power transmission lines
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Media Technology

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