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http://dx.doi.org/10.5515/KJKIEES.2010.21.2.121

Design of High-Power and High-Efficiency Broadband Amplifier Using 1:4 Transmission Line Transformer  

Kim, Kyung-Won (School of Information and Communication Engineering, Sungkyunkwan University)
Seo, Min-Cheol (School of Information and Communication Engineering, Sungkyunkwan University)
Cho, Jae-Yong (School of Information and Communication Engineering, Sungkyunkwan University)
Yoo, Sung-Cheol (School of Information and Communication Engineering, Sungkyunkwan University)
Kim, Min-Su (School of Information and Communication Engineering, Sungkyunkwan University)
Kim, Hyung-Cheol (School of Information and Communication Engineering, Sungkyunkwan University)
Oh, Jun-Hee (School of Information and Communication Engineering, Sungkyunkwan University)
Sim, Jae-Woo (Peopleworks Co.)
Yang, Youn-Goo (School of Information and Communication Engineering, Sungkyunkwan University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.21, no.2, 2010 , pp. 121-128 More about this Journal
Abstract
This paper presents a design of a 100 W high-efficiency power amplifier, whose operational frequency band expands from 30 to 512 MHz, using negative feedback network, push-pull structure, broadband RF choke, and transmission line transformer for balun configuration. The push-pull amplifier has been tuned for higher output power using a shunt capacitor as a matching component at its load especially for high-frequency region. The implemented power amplifier exhibited a very flat power gain of $18.34{\pm}0.9\;dB$ throughout the operating frequency band and very high power-added efficiency(PAE) of greater than 40% at an output power of 100 W. It also showed second- and third-harmonic distortion levels of below -34 dBc and -12 dBc, respectively, through the entire operating frequency band.
Keywords
Broadband Power Amplifier; Transmission Line Transformer; Negative Feedback; Push-Pull; Broadband RF Choke Inductor;
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  • Reference
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