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Design of a Concurrent Dual-Band 1.8-2.4-GHz GaN-HEMT Doherty Power Amplifier

Paul Saad (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik ; GigaHertz Centrum) ; P. Colantonio ; L. Piazzon ; F. Giannini ; Kristoffer Andersson (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik ; GigaHertz Centrum) ; Christian Fager (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik ; GigaHertz Centrum)
IEEE Transactions on Microwave Theory and Techniques (0018-9480). Vol. 60 (2012), 6, p. 1840-1849.
[Artikel, refereegranskad vetenskaplig]

In this paper, the design, implementation, and experimental results of a high-efficiency dual-band GaN-HEMT Doherty power amplifier (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 hybrid technology for the frequency bands 1.8 and 2.4 GHz with the second efficiency peak at 6-dB output power back-off (OBO). For a continuous-wave output power of 20 W, the measured power-added efficiency (PAE) is 64% and 54% at 1.8 and 2.4 GHz, respectively. At -dB OBO, the resulting measured PAEs were 60% and 44% in the two frequency bands. Linearized concurrent modulated measurement using 10-MHz LTE signal with 7-dB peak-to-average-ratio (PAR) at 1.8 GHz and 10-MHz WiMAX signal with 8.5-dB PAR at 2.4 GHz shows an average PAE of 34%, at an adjacent channel leakage ratio of -48 dBc and -46 dBc at 1.8 and 2.4 GHz, respectively.

Nyckelord: Doherty power amplifier (DPA), dual-band amplifier, dual-band matching, transmitters, efficiency, microwave, model



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Denna post skapades 2012-07-04. Senast ändrad 2015-12-17.
CPL Pubid: 160009

 

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