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A broadband inverted Doherty power amplifier for IEEE 802.11b/g WLAN applications

✍ Scribed by Shilei Jin; Jianyi Zhou; Lei Zhang

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
614 KB
Volume
53
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

A broadband inverted Doherty power amplifier (IDPA) is proposed in this article. To achieve the tradeoff between efficiency and operation bandwidth, an optimized output matching network and offset lines are used to design the load network of the proposed power amplifier (PA). For experimental verification, a conventional IDPA and a class‐AB biased balanced PA have been implemented. In addition, a 64‐QAM modulated signal with 24‐MHz channel bandwidth are applied as excitation. According to experiment results, the proposed Doherty power amplifier can keep power‐added efficiency (PAE) higher than 31% from 2.4 to 2.5 GHz with 0.5 dB output‐power flatness at 27‐dBm output power. The PAE of the proposed PA is 16.4% and 4.2% higher than the balanced PA and the conventional IDPA respectively. In addition, the linearity of the proposed PA is improved effectively. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:636–639, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25785

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