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디지털 방식을 사용한 버스트 모드 광 송신기의 온도보상에 관한 연구
채상훈(Sang-Hoon Chai) 호서대학교 공업기술연구소 2005 공업기술연구 논문집 Vol.24 No.1
A temperature compensation block was fabricated and evaluated to use in burst mode fiber optic modules which convert the electrical burst mode data to optical signal through laser diode. To obtain stable temperature compensation characteristics we used a microprocessor instead of a analog circuit block as the temperature compensation block . Lsmg this method we can get more effective controllability in alternative temperature changing and long time using condition.
10.525㎓ 소형 장거리 도플러 센서 움직임 감지기의 구현
채상훈(Sang-Hoon Chai) 한국정보기술학회 2019 한국정보기술학회논문지 Vol.17 No.9
Doppler sensors are less sensitive to external environmental influences such as temperature, humidity, dust, and light, and provide reliable sensing performance compared to existing infrared products. In addition, since the infrared sensor can not penetrate a barrier such as a partition, it is limited by the installation environment. However, since the Doppler sensor transmits a non-metallic product, detection distance increases. In this study, we miniaturized and optimized the transmission / reception antenna and transceiver modules, which are components of the Doppler radar for motion detection using 10.525 ㎓ microwave signal. It reduced size and volume by 30% compared to conventional products, resulting easy installation in tight spaces. By improving the noise characteristics, the reaching distance is extended to more than 30m to improve the performance compared to the existing products.
The Fabrication of Polysilicon Self-Aligned Bipolar Transistor
채상훈,구용서,이진효,Chai, Sang Hoon,Koo, Yong Seo,Lee, Jin Hyo The Institute of Electronics and Information Engin 1986 전자공학회논문지 Vol.23 No.6
A novel n-p-n bipolar transistor of which emitter is self-aligned with base contact by polyilicon is developed for using in high speed and high packing density LSI circuits. The emitter of this transistor is separated less than 0.4 \ulcorner with base contact by self-aligh technology, and the emitter feature size is less than 3x5 \ulcorner\ulcorner Because the active region of this transistor is not damaged through all the process, it has excellent electric properties. Using the n-p-n transistors by 3.0\ulcorner design rules, a NTL ring oscillator has 380 ps, a CML ring oscillator has 390ps, and a I\ulcorner ring oscillator has 5.6ns of per-gate minimum propagation delay time.
버스트 모드 광송신기의 디지털 방식에 의한 온도보상에 관한 연구
채상훈(Sang-Hoon Chai),김동규(Dong-Gyu Kim) 대한전자공학회 2007 電子工學會論文誌-SD (Semiconductor and devices) Vol.44 No.11
레이저 다이오드를 사용하여 전기신호를 광신호로 변환해 주는 버스트 모드 광송신기용 온도보상 방식에 대하여 연구하였다. 기존 실시간 아날로그 방식의 온도보상 방법에 비해, 본 연구에서는 마이크로프로세서를 사용하여 디지털 방식으로 신호를 샘플링 처리함으로써 고속 버스트 모드 광신호를 효과적으로 처리할 수 있도록 하였다. 온도보상을 위한 디지털 자동전력조절방식은 아날로그 방식에 비해 보다 정확하고 효율적이다. 따라서 이 방식은 앞으로 개발된 Gb/s 이상의 고속 버스트 광신호처리에 유용하게 사용될 수 있을 것으로 본다. In this paper, we have studied temperature compensation architecture for a bust mode optical transmitter to convert the electric burst mode date signal to a optical one through the laser diode. In order to get stable high speed data transmission, we used digital sampling technique with a microprocessor for the temperature compensation of the laser diode, not the previous real time analog technique. Though the digital automatic power control circuit should be complemented the previous analog one with accuracy and effectiveness. So the digital technique will be more effective in further future in development for the over Gb/s transmitting speed.
채상훈(Sang-Hoon Chai),이만섭(Man-Sup Lee),조영창(Young-Chang Cho) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.11
A novel efficient group dimming technique is presented. This technique can be applied not only group dimming control of fluorescent or LED lights but also group control of other electrical equipments like heater or motor systems. Some simple technique was used for group dimming control of lamps instead of using communication. To transport control signal for group dimming of lighting system from switch to lamps near 0 crossing point(0~±16V) of AC 220V power signal was transformed to special shape.