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패스 트랜지스터에 바디 구동 기술을 적용한 저면적 LDO 레귤레이터
박준수,유대열,송보배,정준모,구용서,Park, Jun-Soo,Yoo, Dae-Yeol,Song, Bo-Bae,Jung, Jun-Mo,Koo, Yong-Seo 한국전기전자학회 2013 전기전자학회논문지 Vol.17 No.2
본 논문에서는 패스 트랜지스터에 바디 구동 기술을 적용하여 면적을 감소시킨 LDO (Low drop-out) 레귤레이터를 제안하였다. 바디 구동 기술은 트랜지스터의 문턱전압 (Vth)을 감소시켜 드레인 전류를 증가시켜 전류 구동 능력을 향상시킨다. 본 논문에서는 LDO 레귤레이터의 패스 트랜지스터에 바디 구동 기술을 적용하여 면적을 감소시키고, 기존 LDO 레귤레이터와 동일한 성능을 유지하였다. 본 논문에서 제안하는 패스 트랜지스터는 동일한 성능 대비 면적은 5.5 % 감소 하였다. 본 논문에서 제안하는 LDO 레귤레이터는 2.7 V ~ 4.5 V의 입력 전압, 1.2 V ~ 3.3 V의 출력전압 범위를 가지며, 150 mA의 출력 전류를 공급한다. Small area LDO (Low drop-out) regulator with pass transistor using body-driven technique is presented in this paper. The body-driven technique can decrease threshold voltage (Vth) and increase the current ID flowing from drain to source in current. The technique is applied to the pass transistor to reduce size of area and maintain the same performance as conventional LDO regulator. A pass transistor using the technique can reduce its size by 5.5 %. The proposed LDO regulator works under the input voltage of 2.7 V ~ 4.5 V and provides up to 150mA load current for an output voltage range of 1.2 V ~ 3.3 V.
ESD 보호 소자를 탑재한 Peak Current-mode DC-DC Buck Converter
박준수,송보배,유대열,이주영,구용서,Park, Jun-Soo,Song, Bo-Bae,Yoo, Dae-Yeol,Lee, Joo-Young,Koo, Yong-Seo 한국전기전자학회 2013 전기전자학회논문지 Vol.17 No.1
본 논문에서는 인덕터의 흐르는 전류를 감지하여 출력 전압을 일정하게 유지시키는 Peak Current-mode 방식의 DC-DC Buck Converter를 제안하고, 소신호 모델링에 기초하여 Power Stage 설계 방법과 시스템의 안정도를 설계하는 방법을 제안한다. 또한, dc-dc 컨버터의 신뢰성과 성능을 향상시키기 위해 보호회로를 추가하였다. 그리고 정전기 방지를 위하여 ESD 보호회로를 제안하였다. 제안된 보호회로는 게이트-기판 바이어싱 기술을 이용하여 낮은 트리거 전압을 구현하였다. 시뮬레이션 결과는 일반적인 ggNMOS의 트리거 전압(8.2V) 에 비해 고안된 소자의 트리거 전압은 4.1V 으로 더 낮은 트리거 전압 특성을 나타냈다. 본 논문에서 제안하는 회로의 시뮬레이션은 0.35um BCB 공정 파라미터를 이용하였고, Mathworks 사의 Mathlab과 Synopsys 사의 HSPICE 프로그램을 사용하여 검증하였다. In this paper, dc-dc buck converter controled by the peak current-mode pulse-width-modulation (PWM) presented. Based on the small-signal model, we propose the novel methods of the power stage and the systematic stability designs. To improve the reliability and performance, over-temperature and over-current protection circuits have been designed in the dc-dc converter systems. To prevent electrostatic An electrostatic discharge (ESD) protection circuit is proposed. The proposed dc-dc converter circuit exhibits low triggering voltage by using the gate-substrate biasing techniques. Throughout the circuit simulation, it confirms that the proposed ESD protection circuit has lower triggering voltage(4.1V) than that of conventional ggNMOS (8.2V). The circuit simulation is performed by Mathlab and HSPICE programs utilizing the 0.35um BCD (Bipolar-CMOS-DMOS) process parameters.
락토페린이 국내분리 유아 로타바이러스의 MA 104세포 감염에 미치는 영향
차광종(Gwang Jong Cha),유대열(Dae Yeol Yoo),이종기(Jong Gee Lee),유제현(Je Hyun Yoo) 대한바이러스학회 1999 Journal of Bacteriology and Virology Vol.29 No.2
It has long been known that lactoferrin prevents human beings from infection of virus. To prove this activity of lactoferrin, we evaluated the activities of different lactoferrins to an isolate human rotavirus K-21. Bovine lactoferrin inhibited infection of K-21 to MA-104 cell at the concentration of 25.9 ㎛ whereas bovine hydrolysed lactoferrin prevented rotavirus infection at 103.8 ㎛. However human lactoferrin prevented infection of K-21 at the concentration of 217.5 ㎛. These data suggested that lactoferrin activity may be unaffected by the intestinal digestive enzymes and bovine lactoferrin is more active than human lactoferrin with respect to prevention of rotavirus infection.
차광종(Gwang Jong Cha),송진욱(Jin Wook Song),조홍찬(Hong Chan Jo),김용휘(Yong Hwi Kim),유대열(Dae Yeol Yoo),이중복(Joong Bok Lee),이종기(Jong Gee Lee),유제현(Je Hyun Yoo),Taniguchi Koki 대한바이러스학회 1999 Journal of Bacteriology and Virology Vol.29 No.2
Rotaviruses belong to Reoviridae causes diarrhea in human beings as well as domestic animals. This study was conducted to see what type of human rotaviruses are distributed in Seoul and Kyung-gi province. Twenty two of 81 patients showed rotavirus positive with diagnostic kit and RNA electropherosis. We isolated all of rotaviruses from the patients. Electropherotypes of 22 isolates showed 4:2:3:2 pattern whereas those migration patterns were long type. All of those isolates belonged to group A. Twenty out of 22 isolates reacted with monoclonal antibodies specific to G1, P1A and subgroup II, whereas rest of them, A-29 and K-30 reacted with subgroup I specific monoclonal antibody. The nucleotide sequence of an isolate K-21 showed 98-100% and 90-96% homologies with those of Wa and KU strain, respectively.
김종우,이수원,이경광,남명수,유대열 한국낙농학회 1996 韓國酪農學會誌 Vol.18 No.4
Lactoferrin in a 689-amino acid glycoprotein originally isolated from bovine milk. Hololactoferrin consists of a single polypeptide chain folded into two globular lobes, each with one iron binding site. The best known role of lactoferrin in the host defense mechanism is that of a bacteriostatic agent whereby the proliferation of bacteria is inhibited through its iron sequestering properties. Whereas lactoferin may be directly bactericidal and it can also markedly enhance the activity of secretory IgA. Lactoferrin is known to have a wide spectrum of functions. This includes activation of natural killer(NK) cells, regulation of granulo-poiesis, enhancement of antibody dependent cell cytotoxicity (ADCC)activity, stimulation of lymphokine-activated killer(LAK) cell activity and regulation of cytokine release. More research of lactoferrin is necessary, however, before the mechanism of action is fully understood.