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장승현(Seunghyun Jang),박봉혁(Bonghyuk Park),정재호(Jae-Ho Jung) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6
This paper presents broadband circuits and techniques for ultra high-speed wireless communications. In particular, circuit architectures and techniques of low-pass filter and variable gain amplifier for such wide-bandwidth operation are described. The simulation results show the designed circuits will be good candidates for next-generation high-speed wireless communication systems.
Digital-Low-IF 수신구조에서 기저대역보드 측정환경 구성
이성준(Sung Jun Lee),김대호(Daeho Kim),박봉혁(Bonghyuk Park) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
This paper presents environment configuration for the measure of a baseband board of a digital-low-IF receiver, which is based on the two basic points. The first is the use of a test vector through a complex up-conversion of a baseband signal. The other is the fact that a real part of the test vector is just an I (in-phase) component of the test vector. This environment will be employed in the development of receiver to adopt a digital-low-IF scheme.
Digitally-Controlled Dynamic Bias Switching을 이용한 LTE 기지국용 전력증폭기의 효율 개선
서민철(Mincheol Seo),이성준(Sung Jun Lee),박봉혁(Bonghyuk Park),양영구(Youngoo Yang) 한국전자파학회 2014 한국전자파학회논문지 Vol.25 No.8
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. 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.