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A class-E CMOS RF power amplifier with cascaded class-D driver amplifier
Jang, Jaemin,Lee, Hongtak,Park, Changkun,Hong, Songcheol Wiley Subscription Services, Inc., A Wiley Company 2008 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.50 No.2
<P>A 800-MHz power amplifier is designed using a 0.18-μm RF CMOS process. The voltage-combining method is used for power combining. A transmission line transformer on a printed circuit board (PCB) is designed as a power combiner. For the switching mode power amplifier, a cascaded class-D driver amplifier is proposed using a feedback resistor and a DC-blocking capacitor. The power amplifier has an output power of 32.9 dBm and a power-added efficiency of 60.25%. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 470–473, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23106</P>
장재민(JANG, Jaemin),이유봉(LEE, Eubong),한정헌(HAN, Junghun) 대한교통학회 2022 대한교통학회지 Vol.40 No.5
세계 각국은 기후위기 해결방안을 적극 모색하고 있으며 국내 정부 역시 2050년까지 탄소중립을 실천하고자 세부정책을 개발하고 있다. 교통부분의 친환경 정책 중 하나는 노후경유차 폐지로 이에 대한 저감방안은 다양하나 이번 연구는 자동차 세금 중 보유단계에서 부과하는 환경개선부담금 개선을 통한 전략방안 마련이다. 환경개선부담금에 적용되는 부과계수는 2010년에 개정된 내용이며, 과거 10년간 급속히 변해온 자동차 산업 및 기술의 발전, 미세먼지 대응방안 등에 대응하지 못하고 있다. 환경개선부담금 부과계수 개선을 위해 한국교통안전공단에서 시행하는 자동차 검사소 자료를 통해 분석한 결과 화물차이거나, 연식이 오래될수록, 차량이 무거울수록, 연평균 주행거리 길수록, 10년 이상된 노후차량일수록 PM 농도는 높아졌다. 환경개선부담금 개선방안으로 10년 이상의 차량에 동일한 계수가 적용된 부분을 차량년도별 구간을 나누어 PM배출량에 비례하여 부과하며, 차량중량이 PM배출량에 주요한 영향을 미치므로 중량(kg)변수를 추가할 필요가 있다. Countries around the world are actively seeking solutions to the climate crisis, and the Korean government is also developing detailed policies to practice carbon neutrality by 2050. One of the eco-friendly policies in the transportation sector is the abolition of old diesel cars, and there are various ways to reduce them, but this study is a strategic plan by improving the environmental improvement charge imposed at the holding stage of the ca taxes. The coefficient applied to the environmental improvement charge was revised in 2010, and it has not been able to respond to the rapid changes in the automobile industry and technology over the past 10 years, and counter-measures against fine dust. As a result of analyzing data from automobile inspection stations conducted by the Korea Transportation Safety Authority to improve the application coefficient for environmental improvement charges, the PM concentration of trucks, older vehicles, heavy vehicles, long average mileage, and older vehicles of 10 years or more appeared to increase. As a plan to improve the environmental improvement charge, the characteristic that the same coefficient is applied to vehicles over 10 years old is divided into sections by vehicle year and applied in proportion to PM emissions. And since vehicle weight has a major effect on PM emissions, it is necessary to add a weight (kg) variable.