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낮은 전원전압 민감도를 가지는 셀프 캐스코드 구조를 이용한 밴드갭 레퍼런스
ZHONG XIAOLEI,김영석(Yeong-Seuk Kim) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
Bandgap voltage reference circuits, used in battery-operated portable equipments should be able to be designed using standard digital CMOS process and present low-power operation. In this paper a CMOS bandgap voltage reference using self-cascode MOSFET is designed. Self-cascode bandgap voltage reference was utilized by 0.18um CMOS technology and simulated by Cadence Specter. Its temperature coefficient(TC) is typically 29.70ppm/℃ in the temperature of -25℃ to 100℃ and its output resistance of optimized self-cascode bandgap voltage reference is nearly 225MΩ.
Xin Zhong,Yang Yang,Jing Zhao,Binbin Gong,Jingrui Li,Xiaolei Wu,Hongbo Gao,Guiyun Lü 한국식물병리학회 2022 Plant Pathology Journal Vol.38 No.3
Fusarium wilt caused by Fusarium oxysporum f. sp. niveum (Fon) is the most serious soil-borne disease in the world and has become the main limiting factor of watermelon production. Reliable and quick detection and quantification of Fon are essential in the early stages of infection for control of watermelon Fusarium wilt. Traditional detection and identification tests are laborious and cannot efficiently quantify Fon isolates. In this work, a real-time polymerase chain reaction (PCR) assay has been described to accurately identify and quantify Fon in watermelon plants and soil. The FONRT-18 specific primer set which was designed based on identified specific sequence amplified a specific 172 bp band from Fon and no amplification from the other formae speciales of Fusarium oxysporum tested. The detection limits with primers were 1.26 pg/μl genomic DNA of Fon, 0.2 pg/ng total plant DNA in inoculated plant, and 50 conidia/g soil. The PCR assay could also evaluate the relationships between the disease index and Fon DNA quantity in watermelon plants and soil. The assay was further used to estimate the Fon content in soil after disinfection with CaCN2. The real-time PCR method is rapid, accurate and reliable for monitoring and quantification analysis of Fon in watermelon plants and soil. It can be applied to the study of disease diagnosis, plantpathogen interactions, and effective management.
PSPICE를 이용한 PCB 패턴의 RF 신호 손실 모델
최성열(Seong-Yeol Choi),ZHONG XIAOLEI,김영석(Yeong-Seuk Kim) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.11
In this paper, we obtain the optimal width of PCB, and confirm the loss of the PCB pattern signal. Also the PCB pattern models were simulated by applying a RF amplifier circuit. Through this, we studied the effect of the gain when the PCB pattern is applied to the RF amplifier.
전원전압 1.0V 산소 및 과산화수소 기반의 정전압분극장치 설계
김재덕,최성열,김영석,Kim, Jea-Duck,XIAOLEI, ZHONG,Choi, Seong-Yeol,Kim, Yeong-Seuk 한국정보통신학회 2017 한국정보통신학회논문지 Vol.21 No.2
본 논문에서는 전원전압 1V에서 동작하는 산소 및 과산화수소 기반의 혈당전류를 측정할 수 있는 통합형 정전압분극장치를 설계하고 제작하였다. 정전압분극장치는 저전압 OTA, 캐스코드 전류거울 그리고 모드 선택회로로 구성되어 있다. 정전압분극장치는 산소 및 과산화수소 기반에서 혈당의 화학반응으로 발생하는 전류를 측정할 수 있다. OTA의 PMOS 차동 입력단의 바디에는 순방향전압을 인가하여 문턱전압을 낮추어 낮은 전원전압이 가능하도록 하였다. 또한 채널길이변조효과로 인한 전류의 오차를 줄이기 위해 캐스코드 전류거울이 사용되었다. 제안한 저전압 정전압분극장치는 Cadence SPECTRE를 이용하여 설계하였으며, 매그나칩 $0.18{\mu}m$ CMOS 공정을 이용하여 제작되었으며 회로의 크기는 $110{\mu}m{\times}60{\mu}m$이다. 전원전압 1.0V에서 소모전류는 최대 $46{\mu}A$이다. 페리시안화칼륨($K_3Fe(CN)_6$)을 사용하여 제작된 정전압분극장치의 성능을 확인하였다. In this paper, a unified potentiostat which can measure the current of both $O_2$-based and $H_2O_2$-based blood glucose sensors with low supply voltage of 1.0V has been designed and verified by simulations and measurements. Potentiostat is composed of low-voltage operational transconductance amplifier, cascode current mirrors and mode-selection circuits. It can measure currents of blood glucose chemical reactions occurred by $O_2$ or $H_2O_2$. The body of PMOS input differentional stage of the operational transconductance amplifier is forward-biased to reduce the threshold voltage for low supply voltage operation. Also, cascode current mirror is used to reduce current measurement error generated by channel length modulation effects. The proposed low-voltage potentiostat is designed and simulated using Cadence SPECTRE and fabricated in Magnachip 0.18um CMOS technology with chip size of $110{\mu}m{\times}60{\mu}m$. The measurement results show that consumption current is maximum $46{\mu}A$ at supply voltage of 1.0V. Using the persian potassium($K_3Fe(CN)_6$) equivalent to glucose, the operation of the fabricated potentiostat was confirmed.