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자기-바이어스 슈퍼 MOS 복합회로를 이용한 공정 검출회로
서범수,조현묵,Suh Benjamin,Cho Hyun-Mook 한국융합신호처리학회 2006 융합신호처리학회 논문지 (JISPS) Vol.7 No.2
본 논문에서는 새로운 개념의 공정 검출 회로를 제안하였다. 제안된 공정 검출 회로는 장채널 트랜지스터와 최소의 배선폭을 갖는 단채널 트랜지스터 사이의 공정변수의 차이를 비교한다. 이 회로는 공정 변이에 따라 발생하는 캐리어 이동도의 차이를 이용하여 이에 비례하는 차동 전류를 생성해 낸다. 이 방법에서는 고 이득 연산증폭기를 사용한 궤환 회로를 구현함으로써 두 개의 트랜지스터의 드레인 전압이 같아지도록 유지한다. 또한, 본 논문은 제안한 자기-바이어스 슈퍼 MOS 복합회로를 이용하여 고 이득 자기-바이어스 rail-to-rail 연산증폭기를 설계하는 새로운 방법을 소개한다. 설계된 연산증폭기의 이득은 단상의 $0.2V{\sim}1.6V$ 공통모드 범위에서 100dB 이상으로 측정되었다 최종적으로, 제안한 공정 검출 회로는 차동 VCO 회로에 직접 적용하였으며, 설계된 VCO 회로를 통해서 공정 검출 회로가 공정 코너들을 성공적으로 보상하고 광범위한 동작 영역에서 안정된 동작을 수행함을 확인할 수 있었다. In this paper, a new process detection circuit is proposed. The proposed process detection circuit compares a long channel MOS transistor (L > 0.4um) to a short channel MOS transistor which uses lowest feature size of the process. The circuit generates the differential current proportional to the deviation of carrier mobilities according to the process variation. This method keep the two transistor's drain voltage same by implementing the feedback using a high gain OPAMP. This paper also shows the new design of the simple high gam self-biased rail-to-rail OPAMP using a proposed self-biased super MOS composite circuit. The gain of designed OPAMP is measured over 100dB with $0.2{\sim}1.6V$ wide range CMR in single stage. Finally, the proposed process detection circuit is applied to a differential VCO and the VCO showed that the proposed process detection circuit compensates the process corners successfully and ensures the wide rage operation.
드레인 정규화 감지회로를 이용한 차동 PLL 설계 및 차동 공정보상기법
서범수,조현묵,Suh, Benjamin,Cho, Hyun-Mook 한국전기전자학회 2005 전기전자학회논문지 Vol.9 No.1
본 논문은 공정변화를 검출하여 회로에 반영 및 보상하는 드레인 정규화 검출 (regulated drain detection) 방식과 차동 VCO에 적용하는 기법을 제안하였으며, 제안된 방식과 기법을 검증하기 위하여 저 전압 차동 PLL을 제작하여 그 성능을 검증하였다. 제안된 드레인 정규화 검출 방식과 이를 차동적으로 응용하여 설계된 저-지터 차동 PLL은 실제로 $0.18{\mu}m$ 1-폴리 3-메탈 공정으로 제작되었으며 공정변화에 따른 여러 가지 공정 코너 (corner)에 대한 VCO의 동작을 다양한 모의실험을 통하여 검증하였다. 제작된 PLL은 80MHz - 240MHz의 동작범위를 가지며 전체 die size는 내부 루르필터를 포함하여 $330{\mu}m\;{\times}\;380{\mu}m$이다. 1.8V 공급전압 일때 모든 동작주파수에 대한 트랙킹 지터 특성은 150psec peak-to-peak 이하로 안정적인 성능을 보였다. A process variation compensation method called 'regulated drain detection' is proposed. This paper also shows the how this newly invented method is applied to a typical differential PLL. The proposed RDD(regulated drain detection) and its PLL application has been designed and tested in a $0.18{\mu}m$ 1-poly 3-metal plain digital process so that its stable performance and higher yield can be proven. The implemented PLL aimed to the operation range of 80MHz - 240MHz and the total die size is only $0.18{\mu}m$ including the internal loop filter. The tracking jitter characteristics is measured to less than 150 peak-to-peak under l.8V supply rail.
PRML신호용 고성능 Viterbi Decoder의 병렬구조
서범수(Beom-Soo Seo),김종만(Jong-Man Kim),김형석(Hyong-Suk Kim) 대한전기학회 2009 전기학회논문지 P Vol.58 No.4
In this paper, we applied new analog viterbi decoder to decode PR(1,2,2,1) signal for DVD and analyze the specific and signal characteristics. We implemented the parallel analog viterbi decoder and the convolution digital viterbi decoder(the digital PRML) utilizing the technology of analog parallel processing circuits. The proposed analog viterbi decoder can replace the conventional digital viterbi decoder by a new one. Our circuits design the low distortion and the high accuracy over the previous implementation. Through the parallel structure of the proposed viterbi decoder, we got the achievement of the decoding speed by the multiple times.
Self-biased Super MOS 복합회로를 응용한 공정검출회로
徐範洙,趙鉉默 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
A new process detection circuit is proposed. The proposed process detection circuit compares a long channel MOS TR (L > 0.4um) to a short channel MOS TR which uses lowest feature size of the process. The circuit generates the differential current proportional to the deviation of carrier mobilities according to the process variation. This method keep the two TR's drain voltage same by implementing the feedback using a high gain OPAMP. This paper also shows the new design of the simple high gain self-biased rail-to-rail OPAMP using a proposed self-biased super MOS composite circuit. The gain of designed OPAMP is measured over 100dB with 0.2~1.6V wide range CMR in single stage. Finally, the proposed process detection circuit is applied to a differential VCO. The VCO showed that the proposed process detection circuit compensates the process corners successfully and ensures the wide rage operation.
결명자 추출물의 난알부민 감작으로 천식이 유발된 마우스에서의 개선 효과
서범수 ( Beom Su Seo ),박용기 ( Yong Ki Park ) 대한본초학회 2015 大韓本草學會誌 Vol.30 No.1
Objectives : In this study, we investigated the effect of Cassia obtusifolia Linne (Cassiae Semen; CS) extract on ovalbumin (OVA)-induced allergic asthma in mice. Methods : CR was extracted with 70% ethanol. For in vitro study, HMC-1, human mast cells were treated with CS extract at 0.2 and 0.5 ㎎/㎖for 1 h, and then stimulated with compound (C) 48/80 for 30 min. Primary spleenocytes were isolated from the spleen of mice, treated with CS extract for 1 h, and then stimulated with ConA for 24 h. For in vivo study, mice were sensitized at day 0, 7 and 14 with 0.2% OVA and then airway challenged using neublizer at day 21, 23, 25, and 27 to induced allergic asthma. CS extract at doses of 100 and 300 mg/kg body weight was orally administered during OVA challenge once per a day. The levels of allergic mediators such as histamine, OVA-specific IgE, IL-4, and IFN-γ were measured in the sera of mice or culture supernatants by EIA and ELISA, respectively. The expression of IL-4 and IFN-γ gene was determined by RT-PCR. The histopathological change of lung tissues was observed with hematoxylin and eosin (H&E) and Periodic acid Schiff (PAS) staining. Results : The treatment of CS extract in HMC-1 cells significantly inhibited C48/80-induced degranulation, and histamine release. The treatment of CS extract in spleenocytes suppressed the expression of IL-4 and IFN-γ mRNA. The administration of CS extract in OVA-induced asthmatic mice significantly decreased the levels of OVA-specific IgE, and IL-4 in a dose-dependent manner with OVA-control group. In addition, CS extract inhibited the infiltration of inflammatory cells and bronchiolar damage with epithelial thickening in lung tissues of OVA-induced asthma mice, and also mucin accumulation. Conclusions : These results indicate that CS extract prevents asthmatic damage through regulating the allergic immune response.