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V₂O<SUB>5</SUB> 기반의 금속 산화물 투명 광전소자
김상윤(Sangyun Kim),최유림(Yourim Choi),이경남(Gyeong-Nam Lee),김준동(Joondong Kim) 대한전기학회 2018 전기학회논문지 Vol.67 No.6
All transparent metal oxide photoelectric device based on V₂O5 was fabricated with structure of V₂O5/ZnO/ITO by magnetron sputtering system. V₂O5 was deposited by reactive sputtering system with 4 inch vanadium target (purity 99.99%). In order to achieve p-n junction, p-type V2O5 was deposited onto the n-type ZnO layer. The ITO (indium tin oxide) was applied as the electron transporting layer for effective collection of the photo-induced electrons. Electrical and optical properties were analyzed. The Mott-Schottky analysis was applied to investigate the energy band diagram through the metal oxide layers. The V₂O5/ZnO/ITO photoelectric device has a rectifying ratio of 99.25 and photoresponse ratios of 1.6, 4.88 and 2.68 under different wavelength light illumination of 455 nm, 560 nm and 740 nm. Superior optical properties were realized with the high transmittance of average 70 % for visible light range. Transparent V₂O5 layer absorbs the short wavelength light efficiently while passing the visible light. This research may provide a route for all-transparent photoelectric devices based on the adoption of the emerging p-type V₂O5 metal oxide layer.
랜덤 수 생성 회로를 이용한 EMI Noise 저감 회로
김성진(Sung Jin Kim),박주현(Ju Hyun Park),김상윤(SangYun Kim),구자현(Ja Hyun Koo),김형일(Hyung il Kim),이강윤(Kang-Yoon Lee) 한국전자파학회 2015 한국전자파학회논문지 Vol.26 No.9
본 논문에서는 랜덤 수 생성 회로를 통해 Relaxation Oscillator의 주파수를 불규칙하게 변환하여 EMI Noise를 최소화하는 방법을 제시한다. 또한, DC-DC Converter에 이 기법이 적용되었을 때의 효과와 이 결과가 RF Receiver system에 미치는 효과를 Noise 측면에서 연구하였다. 제안하는 Relaxation Oscillator 출력 중심주파수는 7.9 MHz이고, 온도보상기법을 적용하여 온도변화에 따라 주파수가 보상되도록 설계하였다. 이 칩은 0.18 μm 공정으로 설계하였고, 칩의 면적은 220 μm×280 μm이다. 전류 소모는 공급전압인 1.8 V에서 500 μA이다. This paper proposes Relaxation Oscillator with Random Number Generator to minimize electromagnetic interference (EMI) noise. DC-DC Converter with Relaxation Oscillator is presented how much spurious noise effects to RF Receiver system. The main frequency of the proposed Relaxation oscillator is 7.9 MHz to operate it and add temperature compensation block to be applied to the frequency compensation in response to temperature changes. The DC-DC Converter Spurious noise is reduced up to 20 dB through changing frequency randomly. It is fabricated in 0.18 μm CMOS technology. The active area occupies an area of 220 μm×280 μm. The supply voltage is 1.8 V and current consumption is 500 μA.