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In this paper, a novel technique to design concurrent dual-band high-efficiency harmonic tuned (HT) power amplifiers (PAs) is presented. The proposed approach is based on a methodology developed to design multifrequency passive matching networks, which allows concurrent operability. The network design criterion is heavily investigated and later generalized(More)
In this paper, the design, implementation, and experimental results of a high-efciency dual-band GaN-HEMT Doherty power amplier (DPA) are presented. An extensive discussion about the design of the passive structures is presented showing different possible topologies of the dual-band DPA. One of the proposed topologies is used to design a dual-band DPA in(More)
The aim of this paper is to present 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. For this purpose, starting from a simplified model for the adopted active devices, the behavioral analysis of the Class F Doherty amplifier is carried(More)
This contribution presents the theoretical analysis and design guidelines to increase the average efficiency of a Doherty power amplifier (DPA), accounting for the device on-resistance. Starting from a simplified device model, closed-form equations for the estimation of both design parameters and obtainable performances are reported. Moreover, advantages(More)
This paper presents a complete and rigorous theoretical investigation of a Doherty architecture with a novel output combining network. The benefits in terms of bandwidth and feasibility held by the proposed topology are investigated and compared with the conventional one. In particular, the theoretical analysis demonstrates that the proposed output combiner(More)
This paper presents an innovative architecture to drastically enlarge the bandwidth of the Doherty power amplifier (DPA). The proposed topology, based on novel input/output splitting/combining networks, allows to overcome the typical bandwidth limiting factors of the conventional DPA. A complete and rigorous theoretical investigation of the developed(More)
This paper presents the design, implementation, and experimental results of a highly efficient concurrent dualband GaN-HEMT power amplifier at 1.8 GHz and 2.4 GHz. A bare-die approach, in conjunction with a harmonic sourcepull/load-pull simulation approach, are used in order to design and implement the harmonically tuned dual-band PA. For a continuous wave(More)
In this contribution for the first time the design of a simultaneous dual band high efficiency harmonic tuned power amplifier is presented. The active device used is a GaN HEMT with 1 mm of gate periphery. The realised amplifier operates at 2.45 Ghz and 3.3 GHz, and the measured results shown a drain efficiency of 53% and 46%, with an output power of 33 dBm(More)
In this paper, a theoretical investigation of the causes of the AM/PM distortion in Doherty Power Amplifiers is presented for the first time. The distortion sources are identified and a solution to mitigate the AM/PM conversion through the input termination of the Carrier amplifier is also highlighted. The relevant analysis is carried out using a simplified(More)
In this contribution, the design of an uneven AB-C Doherty power amplifier (DPA) in GaN technology, implementing a Class F configuration for the Main device, is presented. Theoretical support will be given to understand why and how some relevant DPA's design parameters have to be carefully selected when a Class F strategy is adopted. Moreover, a comparison(More)