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Effect of load modulation on phase distortion in Doherty power amplifiers

Piazzon, Luca, Giofre, Rocco, Quaglia, Roberto, Camarchia, Vittorio, Pirola, Marco, Colantonio, Paolo, Giannini, Franco and Ghione, Giovanni 2014. Effect of load modulation on phase distortion in Doherty power amplifiers. IEEE Microwave and Wireless Components Letters 24 (7) , pp. 505-507. 10.1109/LMWC.2014.2316507

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Abstract

The mechanisms leading to higher phase distortion of Doherty power amplifiers in comparison to standard architectures are theoretically investigated and experimentally verified. The analysis focuses on the Main amplifier contribution to AM/PM due to the load modulation, a key feature of the Doherty, and is based on a simplified active device circuit approach. Experimental characterization is carried out by source/load-pull measurements on a 4 W die GaN-HEMT at 7 GHz. Measured results confirm the role of the load modulation on the AM/PM distortion, showing that, even if the device nonlinearities are minimized by properly selecting the bias point, a significant residual AM/PM distortion (10° in the present case) appears when the output load is modulated. The effect of this phase distortion on a 14 MHz-256 QAM signal has been evaluated by system level simulations.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Publisher: IEEE Microwave Theory and Techniques Society
ISSN: 1531-1309
Last Modified: 21 Feb 2019 17:36
URI: http://orca-mwe.cf.ac.uk/id/eprint/87619

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