The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Design of High-Efficiency Current Mode Class-D Power Amplifier Using a Transmission-Line Transformer and Harmonic Filter at 13.56 MHz

Transmission-Line Transformer와 Harmonic Filter를 이용한 13.56 MHz 고효율 전류 모드 D급 전력증폭기 설계

  • 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)
  • 서민철 (성균관대학교 정보통신공학부) ;
  • 정인오 (성균관대학교 정보통신공학부) ;
  • 이휘섭 (성균관대학교 정보통신공학부) ;
  • 양영구 (성균관대학교 정보통신공학부)
  • Received : 2012.03.06
  • Accepted : 2012.04.18
  • Published : 2012.05.31
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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.

본 논문은 Guanella의 1:1 transmission-line transformer와 harmonic filtering 방식을 이용한 13.56 MHz 고효율 전류 모드 D급(CMCD) 전력증폭기를 제안한다. 출력 정합 네트워크에 기존의 D급 전력증폭기의 부하 네트워크를 변형하여 harmonic filtering 방식을 포함시킴으로써 낮은 2차와 3차 고조파 특성을 얻었다. 제작된 CMCD 전력증폭기는 13.56 MHz의 CW 입력 신호를 사용하여 측정하였을 때, 13.4 dB의 전력 이득을 가지며, 44.4 dBm의 출력에서 84.6 %의 높은 PAE 특성을 나타내었다. 같은 출력에서 2차 3차 고조파는 각각 -50.3 dBc와 -46.4 dBc를 나타냈다.

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References

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