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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Efficiency Improvement of Power Amplifier Using a Digitally-Controlled Dynamic Bias Switching for LTE Base Station

Digitally-Controlled Dynamic Bias Switching을 이용한 LTE 기지국용 전력증폭기의 효율 개선

  • Seo, Mincheol (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Lee, Sung Jun (Electronics and Telecommunications Research Institute) ;
  • Park, Bonghyuk (Electronics and Telecommunications Research Institute) ;
  • Yang, Youngoo (School of Information and Communication Engineering, Sungkyunkwan University)
  • Received : 2014.06.26
  • Accepted : 2014.08.06
  • Published : 2014.08.31
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Abstract

This paper presents an efficiency enhancement for the high power amplifier using DDBS(Digitally-controlled Dynamic Bias Switching) method which dynamically provides the power amplifier with two bias voltage levels according to the input envelope signal. It is quite easy to adjust the control signal by using a digital processing. The fabricated DDBS PA was evaluated using an 64 QAM FDD LTE signal, which has a center frequency of 2.6 GHz, a bandwidth of 10 MHz and a PAPR of 9.5 dB. The DDBS increases the power amplifier's PAE(Power-Added Efficiency) from 40.9 % to 48 %, at an average output power level of 43 dBm.

본 논문에서는 2.6 GHz에 설계된 고출력 전력증폭기에 DDBS(Digitally-controlled Dynamic Bias Switching)를 적용하여 평균 전력에서 효율을 개선하였다. DBS는 제어 신호에 따라 전력 증폭기에 두 단계의 드레인 전압을 인가하여 효율을 개선하는 기술이다. DBS의 제어 신호를 디지털로 처리하여 제어가 매우 용이하였다. 2.6 GHz의 중심 주파수와 10 MHz 대역폭, 9.5 dB의 PAPR(Peak-to-Average Power Ratio)을 갖는 64 QAM FDD LTE 신호를 사용하여 측정한 결과, DDBS를 적용하여 전력증폭기의 PAE(Power-Added Efficiency)을 평균 전력 43 dBm에서 40.9 %에서 48 %로 증가시켰다.

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References

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