초고속 DRAM의 클록발생 회로를 위한 CMOS 전류원의 설계기법

김대정,Kim, Dae-Jeong 대한전자공학회 2000 電子工學會論文誌-SC (System and control) Vol.37 No.2

본 논문에서는 표준 메모리 공정에 구현이 가능한 CMOS 전류원의 설계 기법에 대해 논한다. 제안하는 설계기법은 자기바이어스 기법을 활용하여 공급전압의 변화에 대해 매우 좋은 특성을 갖고, 새로운 온도보상 기법을 통해 온도변화에 대한 출력전류 변이의 일차성분을 제거할 수 있으며, 칩 내의 전압잡음에 강한 새로운 전류감지 스타트업 회로를 포함한다. 이러한 CMOS 전류원의 회로설계 기법과 함께 제안된 CMOS 전류원을 초고속 DRAM의 클록 발생회로에 적용할 수 있는 방법에 대해서도 논의한다. 본 논문에서 제안된 CMOS 전류원의 설계기법은 해석적인 방법과 함께 회로 시뮬레이션을 통해 그 유용성을 입증한다. This paper describes a design methodology for the CMOS current source which can be implemented in standard memory process. The proposed techniques provide a good characteristic against the power-supply variation by utilizing a self-bias circuit and the reduction of the first-order component of the temperature variation through the new temperature compensation technique and include a new current-sensing start-up circuit enabling a robust operation against the voltage noise generated during the operation of the chip. In addition to the circuit-design technology, techniques where the proposed CMOS current-reference circuit can be applied to the clocking circuits of a very high-speed DRAM are presented. The feasibility of the suggested design methodology for the CMOS current reference is demonstrated by both the analytical method and the circuit simulation.

노광 장치 시뮬레이터 개발

김대정,박윤정,정태호,Kim, Dae Jeong,Park, Yun Jeong,Jung, Taeho 한국시뮬레이션학회 2017 한국시뮬레이션학회 논문지 Vol.26 No.4

우리나라의 반도체와 디스플레이 산업의 발전으로 해당 분야에 대한 인력 수급이 더욱 활발해지고 있다. 이에 따라 학부의 반도체 수업에서는 기존의 이론에 최신 기술 동향뿐만 아니라 현장 중심형 실무 인재 양성을 위해 반도체 제작 공정도 심도 있게 다루고 있다. 하지만, 반도체 공정은 클린룸 안에 설치된 장비들과 고가의 재료들이 필요하기 때문에 대규모로 진행되는 학부 교육에서 공정 실습이 제공되기는 어렵다. 이 한계를 극복하기 위해 실제 공정이나 공정 이론을 시각화한 동영상 등이 보조 자료로서 사용되고 있으나, 실습으로 대체할 교보재로서는 부족하다. 본 연구에서는 이론 중심의 학부 교육에 간접적인 반도체 공정 실습을 제공하기 위해 3차원 기반의 가상 클린룸을 구현하고, 반도체 공정에서 가장 많이 사용되는 노광 장비에 대한 시뮬레이터를 구현하여 사진 공정 베이에 설치하였다. 본 연구에서 구현하는 공정 시뮬레이터는 학부 교육에서 다루는 이론을 시각화하는데 중점을 두었으며, 포토 마스크와 실리콘 웨이퍼의 정렬과 노광 공정의 진행 따른 감광제의 국부적 변화를 시각화하였다. 개발된 시뮬레이터는 모바일 기기 등과 같은 저성능의 컴퓨팅 환경에서도 실행될 수 있도록 메모리 사용을 최소화하여 실용성을 극대화 하였다. With the advances in and expansion of the semiconductor and display businesses in Korea the demand of the engineers in such fields is increasing. Keeping pace with the trend, the semiconductor courses in undergraduate not only include the newest technologies in addition to the fundamental theories but fabrication related technologies as well in order to produce engineers with practical knowledge. However, since semiconductor fabrication requires expensive equipment and materials in a clean room, laboratory class can't be provided in undergraduate. To overcome this limitation actual fabrication processes are recorded in video and played in class. In addition, 3D visualization of fabrication processes can be used.

주파수 적응성을 갖는 부지연 회로의 설계기법

김대정,Kim, Dae-Jeong 대한전자공학회 2000 電子工學會論文誌-SC (System and control) Vol.37 No.3

본 논문에서는 표준 메모리 공정에 구현 가능한 주파수 적응성을 갖는 부지연 회로의 설계기법에 대해 제안한다. 제안하는 설계기법은 기본적으로 아날로그 SMD (synchronous mirror delay) 형태의 부지연 회로로서 입력클록의 주기와 구현하고자 하는 부의 지연 시간의 차이에 해당하는 시간을 아날로그 회로의 개념으로 측정하고 다음 번 주기에서 반복한다. 출력클록의 발생과 관련되는 부수적인 지연을 측정단의 앞 단인 지연모델 단에서 상쇄하는 기존의 SMB 기법과는 달리, 반복단에서 상쇄하는 새로운 기법을 통하여 넓은 부지연 범위를 구현하여 특히 고속동작에서의 부지연 특성을 원할하게 한다. 또한 넓은 범위의 주파수 동작범위를 구현하기 위해 해당하는 주파수 범위에서 아날로그 회로가 최적의 동작 조건을 갖추도록 하기 위한 새로운 주파수 감지기 및 최적조건 설정기법을 제안한다. 제안된 회로의 응용으로서 초고속 DRAM인 DDR SDRAM에 적용하는 예를 보였으며, 0.6㎛ n-well double-poly double-metal CMOS 공정을 사용하여 모의실험 함으로써 그 유용성을 입증한다. In this paper, a design methodology for the frequency-adaptive negative-delay circuit which can be implemented in standard CMOS memory process is proposed. The proposed negative-delay circuit which is a basic type of the analog SMD (synchronous mirror delay) measures the time difference between the input clock period and the target negative delay by utilizing analog behavior and repeats it in the next coming cycle. A new technology that compensates the auxiliary delay related with the output clock in the measure stage differentiates the Proposed method from the conventional method that compensates it in the delay-model stage which comes before the measure stage. A wider negative-delay range especially prominent in the high frequency performance than that in the conventional method can be realized through the proposed technology. In order to implement the wide locking range, a new frequency detector and the method for optimizing the bias condition of the analog circuit are suggested. An application example to the clocking circuits of a DDR SDRAM is simulated and demonstrated in a 0.6 ${\mu}{\textrm}{m}$ n-well double-poly double-metal CMOS technology.

CCD 영상센서를 위한 CMOS 아날로그 프론트 엔드

김대정,남정권,Kim, Dae-Jeong,Nam, Jeong-Kwon 한국전기전자학회 2009 전기전자학회논문지 Vol.13 No.1

본 논문은 고성능 이미지 센서인 CCD 시스템에서 전체 시스템의 성능을 좌우하는 아날로그 프론트 엔드(analog-front end, AFE)를 영상신호처리 유닛과 함께 SoC로써 구현한 설계에 관한 것이다. 데이터의 전송속도가 빨라짐에 따라 데이터 샘플링의 불확실성을 낮추었으며, $0{\sim}36\;dB$의 높은 이득을 가지는 지수함수적인 가변 이득단의 대역폭을 구현하기 위한 구조 및 증폭기의 정밀도를 높이기 위한 기생 커패시턴스에 둔감한 커패시터 배열을 개발하였다. 또한, 블랙-레벨 상쇄를 위한 아날로그 및 디지털 영역에서의 이중 블랙 레벨 상쇄를 효과적으로 구현하였다. 제안된 구조를 $0.35-{\mu}m$ CMOS 공정으로 구현하였으며, 10-bit 해상도의 전체 CCD 카메라 시스템에 적용하여 그 동작을 검증하였다. 제안한 AFE는 3.3 V 공급전압 및 15 MHz의 데이터 전송속도에서 80 mA를 소모하였다. This paper describes an implementation of the analog front end (AFE) incorporated with the image signal processing (ISP) unit in the SoC, dominating the performance of the CCD image sensor system. New schemes are exploited in the high-frequency sampling to reduce the sampling uncertainty apparently as the frequency increases, in the structure for the wide-range variable gain amplifier (VGA) capable of $0{\sim}36\;dB$ exponential gain control to meet the needed bandwidth and accuracy by adopting a new parasitic insensitive capacitor array. Moreover, the double cancellation of the black-level noise was efficiently achieved both in the analog and the digital domain. The proposed topology fabricated in a $0.35-{\mu}m$ CMOS process was proved in a full CCD camera system of 10-bit accuracy, dissipating 80 mA at 15 MHz with a 3.3 V supply voltage.

賣渡人의 暇疪擔保責任의 本質

金大貞(Kim, Dae-Jeong) 전북대학교 법학연구소 1992 法學硏究 Vol.19 No.-

현행법상 이자제한(利子制限)에 관한 연구

김대정(Dae Jeong Kim) 중앙법학회 2007 中央法學 Vol.9 No.2

不動産登記의 推定力

金大貞(Kim, Dae-Jeong) 중앙법학회 2016 中央法學 Vol.18 No.4

Differently from BGB(the German Civil Code) or ZGB(the Civil Code of Switzerland), The Korean Civil Code has no provision that provides the Effect of Presumption of the Land Registration. And yet, there is no such opinion that the Effect of Presumption of the Land Registration could not be approved under the present Korean Civil Code. The question is what the nature of the Effect of Presumption of the Land Registration is. There is some dissent on this issue, but it is difficult to see as a presumption of law the Effect of Presumption of the Land Registration under the present Korean Civil Code that has no provision on this issue. The nature of the Effect of Presumption of the Land Registration is a mere presumption of fact that the presumed fact will be taken as proved unless the opponent adduces some evidence to rebut the presumption. The Korean Supreme Court approved the superior effect of presumption to the Land Registration by the Special Measures Law on Land Registration of Real Estate because this Registration has much higher probability of truth than the general Registration. But as a matter of fact, the probability of truth of the Land Registration by the Special Measures Law on Land Registration of Real Estate is not higher than the probability of truth of the general Registration. Thus, the case law of the position of the Korean Supreme Court should be discarded.

계약교섭(契約交涉)의 부당파기(不當破棄)로 인한 손해배상책임(損害賠償責任)

김대정(Dae Jeong Kim) 중앙법학회 2009 中央法學 Vol.11 No.3

The negotiation for conclusion of contract can be broken off at any time before the completion of the contract on the basis of the Principle of freedom of contract and Self-responsibility. That is to say a party is free to negotiate and is not liable for failure to reach an agreement. Consequently a party who have firmly believed and have paid the costs connected with the preparation of an offer is to take the risk on his own responsibility. However, it is coincided with a view that a negotiating party who has broken off negotiations in bad faith(contrary to good faith) is exceptionally liable for the losses caused to the other party who has reasonably relied upon an offer even before it has been accepted. The problem is how can we frame a theory that will be able to support theoretically the liability for the losses caused to the other party by breaking off negotiations in bad faith. On this problem, the majority in Korea insists that the liability for the losses caused to the other party by breaking off negotiations in bad faith is a kind of breach of contract from the pre-contractual duties, and insists that we should acknowledge the liability of one party for the other party`s reliance damages(a breach of contract) suffered through relying on the party) by analogical interpretation of the Article 535 of the Koean Civil Code(KBGB §535) that includes provision for the Culpa in Contrahendo in an invalid contract owing to impossibility from the beginning. Recently a new critical theory has emerged and pointed out that the Theory of Culpa in Contrahendo is merely an artificial theory for the purpose of resolving problems from the defectiveness of the German Tort Law(BGB), and the theory insists that the Korean Civil Code includes general provision for tort(KBGB §750) and so in Korea not only a person may be held liable for harm resulting from infringement of property(not of absolute rights) but also the immunity from responsibility in employer`s liability is scarcely permitted, therefore it is not necessary for us to introduce the German theory of Culpa in Contrahendo. The Korean Supreme Court`s precedent takes a firm standpoint that cases of this kind(the liability for the losses it has caused to the other party by breaking off negotiations in bad faith) are to be argued as tort cases rather than as contract cases, and to impose tort liability from breaking off negotiations in bad faith for a party it is essential for the other party to have reason to rely upon on the positive outcome of the negotiations. I think that the critical theory and the standpoint of The Korean Supreme Court`s precedent that apporoved the new critical theory are all right and proper.

2013년 『채무불이행법 개정안』에 관한 약간의 검토

金大貞(Kim, Dae-jeong) 중앙법학회 2015 中央法學 Vol.17 No.4

This paper is focused on my opinion that aims to investigate problems in the provisions on the Non-performance especially Incomplete-Performance in the Draft 2013 of the Korean Civil Code, and to present a alternative proposal for this issue. To achieve the aim of this paper, in the first place I have analyzed the phase of the theory of Incomplete-Performance by investigating the system of regulations of the current Korean Civil Code on the Non-Performance, and by investigating whether or not the theory of Incomplete-Performance(it means an incomplete-performance or a positive violation of the obligatory right that provokes the expanded prejudice to creditor) is approved as a resonable theory of interpretation of the current Korean Civil Code, and by investigating whether the theory that insist the §390 of the current Korean Civil Code is a positive legal basis of the theory is right or not. Through these investigations I have arrived at the conclusion that while we admit the §390 of the current Korean Civil Code covers incomplete-performance, from this it is not necessarily drawn the conclusion that the concept of the Incomplete-Performance of this provision covers a positive violation of an obligatory right that provokes the expanded prejudice to the creditor that means primarily a tort liability, it should be regarded that whether the §390 of the current Korean Civil Code covers a positive violation of an obligatory right that provokes the expanded prejudice to the creditor or not is entrusted the theory and the judicial precedents. The Draft 2013 of the Korean Civil Code propose to stipulate the claim rights of “nacherfüllung”(it means a right of creditor to demand making subsequent completion) that has been dicussed for a long time in lecturing theory as an effect of incomplete- performance. However under the present circumstances that the theory and the judicial precedents about the claim rights of “nacherfüllung” is not yet clearly established, and what"s more, the endeavor to revise the Law of Seller’s Warranty has been aborted, the revision of the §390 of the Korean Civil Code by stipulating the claim rights of “nacherfüllung” as a general effct of the Incomplete-Performance might provoke a serious disoder in the interpretation of the legal conditions and effect of the claim rights of “nacherfüllung” in relation with the Seller’s Warranty. Therefore I think that it is desirable to delete temporarily the provisions about the claim rights of “nacherfüllung” in the Draft 2013 of the Korean Civil Code, and to stipulate it after ending full discussion about the claim rights of “nacherfüllung” and when the Law of Seller’s Warranty will be revised.

이자채권과 대부업법에 의한 이자의 제한

김대정(Dae Jeong Kim) 중앙법학회 2004 中央法學 Vol.6 No.4