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An analysis of the suitability of using CW-theory when designing Doherty PAs for wideband or concurrent multi-band operation

David Gustafsson (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Christer Andersson (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Christian Fager (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik)
43rd European Microwave Conference, EuMC 2013 - Held as Part of the 16th European Microwave Week, EuMW 2013, Nuremberg, Germany, 7-10 October 2013 p. 287-290. (2013)
[Konferensbidrag, refereegranskat]

In this paper it is analyzed whether the commonly used continuous-wave (CW) based theory can properly describe and predict the behavior of the Doherty power amplifier (DPA) under wideband or concurrent multi-band operation. The analysis shows that the CW-theory in fact fails to do so and that the functionality of the DPA is strongly dependent on how intermodulation frequencies are terminated. In particular, it is shown that the network connecting the main and auxiliary amplifiers needs to function as an impedance inverter at specific odd order intermodulation frequencies, such as the cross-carrier intermodulation in the multi-band case. The theoretical analysis is verified by simulations, demonstrating how the functionality of a concurrent dual-band DPA is distorted despite CW-theory predicting ideal performance in each band. The findings in this paper are an important contribution to the understanding of how to further improve the performance of wideband or concurrent multi-band DPAs.

Nyckelord: Broadband amplifiers, concurrent, Doherty, high efficiency, multi-band, power amplifiers, wideband



Denna post skapades 2015-05-07. Senast ändrad 2015-12-17.
CPL Pubid: 216752

 

Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik

Ämnesområden

Elektroteknik och elektronik

Chalmers infrastruktur