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Design of a broadband power amplifier using an optimized feedback network

✍ Scribed by K. Kim; M. Seo; J. Jeon; M. Kim; H. Kim; H. Lim; C. Park; Y. Yang

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

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✦ Synopsis

Abstract

This article presents a systematic design method for ultra broadband power amplifiers using an optimized feedback network. Based on the analysis using the network parameters for the open‐loop circuit and feedback network, a design and optimization procedure was established. To make the gain response as flat as possible throughout the broad operating frequency band, the optimized component values of the feedback network were found using an optimization program which was built based on the least‐mean‐square‐error algorithm in MATLAB. Single‐ended broadband power amplifiers were implemented to verify the optimization results for various target gains, as well as source and load impedance sets. One of the single‐ended amplifiers was selected for use as part of the push–pull power amplifier which includes broad‐band 1:1 transmission line transformers. For the operational bandwidth from 8 to 800 MHz, the ultra broad‐band push–pull power amplifier exhibited a flat gain response of ±0.331 dB from 17.2 dB, a P~1dB~ of more than 40.5 dBm, and high PAE from 26.7 to 45 % at each P~1dB~ point. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2846–2851, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26372

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