Proceedings ArticleDOI
A new "series-type" Doherty amplifier for miniaturization
Joomin Jung,Unha Kim,Jooyoung Jeon,Junghyun Kim,Kyungteh Kang,Youngwoo Kwon +5 more
- pp 259-262
TLDR
In this paper, a new topology of Doherty amplifier is proposed to reduce the circuit size by eliminating the bulky 3 dB 90/spl deg/ hybrid coupler, and the fabricated 2.45 GHz amplifier module using the proposed topology demonstrates enhanced efficiencies in the low to mid power ranges and shows good gain flatness.Abstract:
A new topology of Doherty amplifier is proposed to reduce the circuit size by eliminating the bulky 3 dB 90/spl deg/ hybrid coupler. Unlike the classical Doherty amplifier, the carrier and peak amplifiers are connected in series together with an impedance-inverting network connecting the outputs of both amplifiers. A simple matching circuit between the peak and carrier amplifier replaces the input hybrid coupler. In this way, the need for an input hybrid coupler is eliminated, facilitating integration and miniaturization. The fabricated 2.45 GHz amplifier module using the proposed topology demonstrates enhanced efficiencies in the low- to mid-power ranges and shows good gain flatness. This approach is promising for highly-integrated Doherty-type amplifiers for handset applications.read more
Citations
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Book
High Efficiency RF and Microwave Solid State Power Amplifiers
TL;DR: In this paper, the authors present an overview of power amplifiers and their application in the context of load-pulling and power-combiner networks, as well as their properties.
Journal ArticleDOI
High-Efficiency Doherty Power Amplifiers: Historical Aspect and Modern Trends
Andrei Grebennikov,Senad Bulja +1 more
TL;DR: The historical aspect of the Doherty approach to the power-amplifier design introduced in 1936 and modern trends in Doherty amplifier (DA) design techniques using multistage and asymmetric multiway architectures are described and discussed.
Journal ArticleDOI
Theory and Experimental Results of a Class F AB-C Doherty Power Amplifier
TL;DR: In this article, a closed-form formulation suitable for a direct computer-aided design synthesis of a Doherty amplifier employing a Class F design strategy for the main (or Carrier) device is presented.
Journal ArticleDOI
Design of a High-Efficiency and High-Power Inverted Doherty Amplifier
Gunhyun Ahn,Min-Su Kim,Hyun-Chul Park,Sung-Chan Jung,Ju-ho Van,Hanjin Cho,Sung-wook Kwon,Jonghyuk Jeong,Kyung-hoon Lim,Jaeyoung Kim,Sung Chan Song,Cheon-Seok Park,Youngoo Yang +12 more
TL;DR: In this article, the authors presented a design method for a compact inverted Doherty power amplifier (IDPA), which has high-efficiency and high-power characteristics, by dynamically modulating the load impedance according to the input power drive.
Journal IssueDOI
The AB-C Doherty power amplifier. Part II: Validation
TL;DR: In this paper, the theoretical analysis of a Doherty amplifier employing a Class AB bias condition for the Main Amplifier and a Class C one for the Auxiliary device has been presented.
References
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Journal ArticleDOI
A New High Efficiency Power Amplifier for Modulated Waves
TL;DR: 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.
Journal ArticleDOI
A new high-efficiency power amplifier for modulated waves
TL;DR: The use of increasingly higher power levels in broadcasting in the last few years has attached new importance to the matter of more efficient operation of the high-power stages in radio transmitters and the resulting reductions in cost of power, size of high-voltage transformers and rectifier, and water cooling requirements, are of particular importance in transmitters having outputs of 50 kilowatts or more as discussed by the authors.
Book
Advanced Techniques in RF Power Amplifier Design
TL;DR: RF power amplifier modes Doherty and Chireix - themes and variations topics in PA non-linearity envelope feedback predistortion feedforward microwave-power amplifier design.
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.