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RISS 인기검색어
- 검색키워드
- 저자 : 전승기(Seung-Ki Jeon) (검색결과 6 건)
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AMOLED 디스플레이용 3-채널 DC-DC 변환기 설계
전승기(Seung-Ki Jeon),김찬유(Chan-You Kim),김학윤(Hak-Yoon Kim),최호용(Ho-Yong Choi) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.11
In this paper, we design a highly integrated 3-channel DC-DC converter. Two channel, a positive voltage VPOS and a negative voltage VNEG, are designed for two supply voltages of AMOLED display. For positive voltage, VPOS, a boost converter followed by a LDO (Low Dropout) is designed using PSM/PWM dual mode to minimize power dissipation and decrease output voltage ripple. For a negative voltage, VNEG, a 0.5 x regulated inverting charge pump is designed to decrease size and power dissipation. For an additional positive voltage, V A VDD , a LDO is designed using an error amplifier to drive another fixed positive voltage. The proposed circuit has been designed using a 0.18㎛ BCDMOS process. Simulation results show that our integrated power supply has power efficiency of 57% ~ 89% for load current range of 1 mA ~ 70 mA and output voltage ripple less than 20 mV.
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PTWS를 적용한 웨어러블 AMOLED용 고집적화 3-채널 DC-DC 변환기 설계
전승기(Seung-Ki Jeon),이희진(Hui-Jin Lee),최호용(Ho-Yong Choi) 대한전자공학회 2019 대한전자공학회 학술대회 Vol.2019 No.6
In this paper, we present a highly integrated 3-channel DC-DC converter using power transistor width scaling(PTWS). Two channel, a positive voltage VPOS and a negative voltage VNEG, are designed for two supply voltages of AMOLED display panel. For positive voltage, VPOS, a boost converter is designed using SPWM dual mode and PTWS to decrease power dissipation in lightload and decrease output voltage ripple. For a negative voltage, VNEG, a 0.5 x regulated inverting charge pump is designed to decrease size and power dissipation. For an additional positive voltage, VAVDD, a LDO is designed using an error amplifier to drive another fixed positive voltage. The proposed circuit has been designed using a 0.18㎛ BCDMOS process. Simulation results show that our integrated power supply has power efficiency of 51% ~ 90% for load current range of 1 mA ~ 70 mA and output voltage ripple less than 20 mV.
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8um 피치 SXGA급 비냉각 적외선 검출기 개발 및 환경성 평가
전승기 ( Seung Ki Jeon ),권명호 ( Myung Ho Kwon ),강상구 ( Sang Gu Kang ),한명수 ( Myung Soo Han ) 한국국방기술학회 2022 한국국방기술학회 논문지 Vol.4 No.3
비냉각형 적외선 검출기를 적용한 열상 시스템의 경우 군수용 및 민수용 분야에서 다양하게 응용 범위를 넓혀가고 있다. 특히 군수용 열상 시스템의 경우 보다 체계의 고도화를 위한 고해상도 적외선 센서 개발이 요구되고, 민수용 열상 시스템의 경우 다양한 에플리케이션에 적용하기 위해 열상 검출기의 소형화 및 경량화가 요구된다. 적외선 센서의 픽셀 피치를 17um 피치에서 8um 피치크기로 감소시킴으로써, 소형화 및 고해상도 센서 개발이 용이하지만, 이로인한 적외선 센서 성능이 감소하는 문제를 극복하는 것이 기술 개발 핵심이다. 감소된 픽셀 피치의 적외선 센서의 성능을 극대화하기 위해서는 입사하는 적외선을 흡수하는 영역과 열적 고립을 위한 영역의 구조적 분리가 필요하며 이를 구현하기 위해 복층 구조의 마이크로볼로미터 개발이 요구된다. 본 논문에서는 8μm 픽셀 피치를 갖는 SXGA급(1280*1024) 비냉각 적외선 검출기 개발에 관한 것으로 피치가 감소하면서 발생하는 수광 면적 감소 및 열적 고립도 감소를 개선하기 위하여 복층 구조 FPA(Focal Plane Array) 설계 기술 및 0.18um MEMS Technology 설계 기술을 활용하였으며, 소형화 및 경량화를 위해 세라믹 패키지를 적용하여 NETD 50mK 이하의 비냉각형 적외선 검출기를 제작하였다. 또한 비냉각 적외선 검출기에 대한 환경성 및 신뢰성 시험 평가를 수행하여 체계적용성 및 실용성을 검증을 하였다. In the case of a thermal imaging system to which a uncooled infrared detector is applied, the application range is expanding in various ways in the field of military and civilian use. In particular, in the case of a military thermal system, it is required to develop a high-resolution infrared sensor to upgrade the system, and in the case of a civil thermal system, it is required to miniaturize and lighten the thermal detector to apply to various applications. By reducing the pixel pitch of infrared sensors from 17um pitch to 8um pitch size, it is easy to develop miniaturized and high-resolution sensors, but overcoming the problem of decreasing infrared sensor performance is the key to technology development. The structural separation of an area absorbing incident infrared rays and an area for thermal isolation is required to maximize the performance of an infrared sensor with a reduced pixel pitch, and to implement this, it is required to develop a multi-layered microbolometer. In this paper, we develop an SXGA-class (1280*1024) uncooled infrared detector with an 8um pixel pitch and fabricate using multilayered FPA(focal plane array) design techniques and 0.18um 3D MEMS technology design techniques to improve absorption area and thermal isolation reduction as the pitch decreases. For miniaturization and weight reduction of infrared detectors, ceramic packages were applied to manufacture uncooled infrared detectors of NETD 50 mK or less. In addition, environmental and reliability test evaluation of uncooled infrared detectors was performed to verify system applicability and practicality.
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웨어러블 AMOLED 디스플레이용 2-채널 DC-DC 변환기 구현
김찬유(Chan-You Kim),김진원(Jin-Won Kim),전승기(Seung-Ki Jeon),김학윤(Hak-Yun Kim),최호용(Ho-Yong Choi) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.11
In this paper, a 2-channel power supply with a noninverting DC-DC buck converter and an inverting charge pump has been designed for wearable AMOLED displays. The DC-DC buck converter for a positive channel,VPOS , has been designed using a PWM-SPWM (set-time variable pulse width modulation) dual mode to increase power efficiency under light load. And the inverting charge pump for a negative channel, VNEG , using the PSM (pulse skipping modulation) mode is adopted to decrease device volume. The proposed circuit has been implemented using a 0.35 μm standard CMOS process with core area of 8.4 ㎟for VPOS and 0.7 ㎟ for VNEG . Experiment results show that V<SUP>POS</SUP> has 2 V ∼ 2.7 V and VENG has -3 V ∼ -2.5 V for both input voltage of 3.3 V ∼ 4.2 V and load current of 5 mA ∼ 50 mA. And the proposed circuit has power efficiency of 65% ∼ 75% for VPOSand 49% ∼ 72% for VENG according to load current range of 5 mA ∼ 50 mA.
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