Journal ArticleDOI
A New High Efficiency Power Amplifier for Modulated Waves
W. H. Doherty
- Vol. 24, Iss: 9, pp 1163-1182
TLDR
In this paper, a new form of linear power amplifier for modulated radio-frequency waves was introduced, which achieved a plate circuit efficiencies of sixty to sixty-five per cent independent of modulation.Abstract:
This paper introduces a new form of linear power amplifier for modulated radio-frequency waves. Plate circuit efficiencies of sixty to sixty-five per cent independent of modulation are obtained by means of the combined action of varying load distribution among the tubes and varying circuit impedance over the modulation cycle. The theory of operation is developed and detailed observations on the behavior of tubes in the new circuit are given in the paper. The use of stabilized feedback in connection with this circuit is discussed and significant measurements on a laboratory model of a fifty-kilowatt transmitter are shown.read more
Citations
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Journal ArticleDOI
Efficiency of Doherty RF Power-Amplifier Systems
TL;DR: A Doherty system combines the outputs of two or more linear RF power amplifiers through an impedance-inverting coupler such as a quarter-wave transmission line and can be considerably more efficient than a conventional class-B linear PA.
Journal ArticleDOI
An extended Doherty amplifier with high efficiency over a wide power range
TL;DR: In this article, an extension of the Doherty amplifier, which maintains high efficiency over a wide range of output power (>6 dB), is demonstrated experimentally with InGaP/GaAs heterojunction bipolar transistors at 950 MHz.
Journal ArticleDOI
The Doherty power amplifier
TL;DR: In this article, the Doherty amplifier is implemented using laterally diffused metal oxide semiconductor (LDMOS) transistors and measured using a WCDMA 4FA signal.
Book ChapterDOI
Stabilized Feedback Amplifiers
TL;DR: In this paper, the theory of the feedback principle and its application in a carrier-in-cable system were described and explained. And the results of this trial were highly satisfactory and demonstrated conclusively the correctness of the theory and the practicability of its commercial application.
Proceedings ArticleDOI
An extended Doherty amplifier with high efficiency over a wide power range
M. Iwamoto,A. Williams,P.F. Chen,A. Metzger,Chengzhou Wang,Lawrence E. Larson,Peter M. Asbeck +6 more
TL;DR: In this paper, an extension of the Doherty amplifier architecture which maintains high efficiency over a wide range of output power (>6 dB) is presented, and the authors demonstrated experimentally with InGaP-GaAs HBTs at a frequency of 950 MHz.
References
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Book ChapterDOI
Stabilized Feedback Amplifiers
TL;DR: In this paper, the theory of the feedback principle and its application in a carrier-in-cable system were described and explained. And the results of this trial were highly satisfactory and demonstrated conclusively the correctness of the theory and the practicability of its commercial application.
Journal ArticleDOI
Stabilized feedback amplifiers
TL;DR: In this paper, the theory of the feedback principle and the underlying principle of design by means of which singing is avoided is described and some examples of results obtained on amplifiers which have been built employing this new principle.
Journal ArticleDOI
Stabilized Feed-Back Amplifiers
TL;DR: Discussion of a paper by H. S. Black published in the January 1934 issue, p. 114–20, and presented for oral discussion at the communication session of the winter convention, New York, N. Y., Jan. 24, 1934.