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The AB-C Doherty power amplifier. Part I: Theory
International Journal of RF and Microwave Computer-Aided Engineering, 2009 In this article, the complete theoretical analysis of a Doherty amplifier employing a Class AB bias condition for the Main and a Class C one for the Auxiliary devices, respectively, is presented.
Paolo Colantonio +2 more
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2015 IEEE MTT-S International Microwave Symposium, 2015
The Doherty power amplifier (DPA) architecture, in various formats using different technologies, has been a very popular means of providing high conversion efficiencies from raw electrical power to sophisticated modulated RF and microwave signals ever since the requirements for very high power amplitude modulated (AM) radio transmitters in the mid-1930'
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The Doherty power amplifier (DPA) architecture, in various formats using different technologies, has been a very popular means of providing high conversion efficiencies from raw electrical power to sophisticated modulated RF and microwave signals ever since the requirements for very high power amplitude modulated (AM) radio transmitters in the mid-1930'
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Broadband Doherty power amplifiers
2013 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications, 2013In this paper, the transformer-less load-modulated (TLLM) architecture for designing broadband Doherty amplifiers is presented. In this architecture, the quarter-wave impedance transformers of the Doherty amplifier are not used. As a result, the design will be much more compact and large operational bandwidths can be obtained.
Mohammadhassan Akbarpour +2 more
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Linearization of broadband doherty amplifier
2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS), 2013The linearization of broadband two-way Doherty amplifier for application in the frequency range 0.85-1.15GHz is considered in this paper. The carrier and peaking amplifiers in Doherty configuration comprise Freescale's transistor MRF281S LDMOSFET characterized by the maximum output power 4W and the broadband lumped element matching circuits.
Aleksandra Doric +3 more
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On the bandwidth performance of Doherty amplifiers
2013 IEEE International Wireless Symposium (IWS), 2013The theoretical bandwidth constrains of conventional symmetric and asymmetric Doherty amplifiers are evaluated and compared to those of the recently introduced novel three and 4-way Doherty amplifier configurations. Performance trends are identified and backed-up by practical results.
L. C. N. de Vreede +2 more
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Doherty Goes Digital: Digitally Enhanced Doherty Power Amplifiers
IEEE Microwave Magazine, 2016Efficiency enhancement techniques for high-power amplification systems are now mature technologies, with Doherty power amplifiers (PAs) being widely used in field-deployed wireless base stations. A typical Doherty PA consists of two parallel amplifiers (a carrier amplifier, biased in class-AB, and a peaking amplifier, biased in class-C), an input ...
Ramzi Darraji +2 more
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Emulation of Doherty Amplifiers Using Single- Amplifier Load–Pull Measurements
IEEE Microwave and Wireless Components Letters, 2020A measurement-based approach for the analysis of Doherty power amplifiers (DPAs) is presented. The DPA behavior is emulated using an active load–pull setup, exciting a single device under test (DUT) in either of two states, corresponding to the main and auxiliary branches in a DPA.
William Hallberg +3 more
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Optimizing the Doherty Amplifier: Design of a 3-GHz GaN Doherty Amplifier Achieving 60% Efficiency
IEEE Microwave Magazine, 2020The Doherty amplifier, invented by William H. Doherty, has been around since 1936 [1]-[3]. The amplifier has seen a resurgence in recent times, in part due to the work of Steve Cripps [4]. The Doherty?s ability to achieve high efficiency over a wide band of frequencies and its high linearity characteristics make it an effective architecture for ...
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Doherty CMOS power amplifiers for 5G technology
2017 24th IEEE International Conference on Electronics, Circuits and Systems (ICECS), 2017Currently, there is a large move towards 5G wireless technology beyond the existing, widely used 4G technology due to an increased use of smart devices, and multimedia content. 5G technology is expected to operate at high frequencies between 15 GHz and 100 Ghz opening up a new horizon for spectrum constrained future wireless communications.
Nourhan Elsayed +3 more
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GaN Doherty Amplifier With Compact Harmonic Traps
2008 38th European Microwave Conference, 2008In this contribution, the design of an uneven AB-C Doherty power amplifier (DPA) in GaN technology, implementing a new approach to control the higher device harmonics, is presented. The DPA was designed to operate at 2.14 GHz and with the aim to reduce as much as possible the chip size, without losing the Doherty operating principle.
COLANTONIO, PAOLO +3 more
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