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http://dx.doi.org/10.5515/KJKIEES.2012.23.5.624

Design of High-Efficiency Current Mode Class-D Power Amplifier Using a Transmission-Line Transformer and Harmonic Filter at 13.56 MHz  

Seo, Min-Cheol (School of Information and Communication Engineering, Sungkyunkwan University)
Jung, In-Oh (School of Information and Communication Engineering, Sungkyunkwan University)
Lee, Hwi-Seob (School of Information and Communication Engineering, Sungkyunkwan University)
Yang, Youn-Goo (School of Information and Communication Engineering, Sungkyunkwan University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.23, no.5, 2012 , pp. 624-631 More about this Journal
Abstract
This paper presents a high-efficiency current mode class-D(CMCD) power amplifier for the 13.56 MHz band using a Guanella's 1:1 transmission-line transformer and filtering circuits at the output network. The second and third s are filtered out in the load network of the class-D amplifier. The implemented CMCD power amplifier exhibited a power gain of 13.4 dB and a high power-added efficiency(PAE) of 84.6 % at an output power of 44.4 dBm using the 13.56 MHz CW input signal. The second and third distortion levels were -50.3 dBc and -46.4 dBc at the same output power level, respectively.
Keywords
Switching Mode Power Amplifier; Current Mode Class D; Control; Transmission-Line Transformer; Filter;
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