• Title/Summary/Keyword: Termination

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Junction termination technology for 4H-SiC devices (Junction termination 기법에 따른 4H-SiC 소자의 항복전압 특성 분석)

  • Kim, H.Y.;Bahng, W.;Song, G.H.;Kim, N.K.;Kim, E.D.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.286-289
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    • 2003
  • In the case of high voltage devices, junction termination plays an important role in determining the breakdown voltage of the device. The mesa junction termination has been demonstrated to yield nearly ideal breakdown voltage for 6H-SiC p-n junctions. However, such an approach may not be attractive because of the nonplanar surface, which is difficult to passivate. Moreover, In case of 4H-SiC, ideal breakdown voltage could not be achieved using mesa junction termination. For 4H-SiC planar junction termination technique is more useful one rather than mesa junction termination. In this paper, breakdown characteristics of the 4H-SiC device with planar junction termination, such as FLR(Field Limiting Ring), FP(Field Plate) and JTE(Junction Termination Extension), is presented. In the case of the FLR, breakdown voltage of 1800V is obtained. And breakdown voltage of 1000V and 1150V is also obtained for the case of FP and JTE case, respectively.

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A Single-Ended Transmitter with Variable Parallel Termination (가변 병렬 터미네이션을 가진 단일 출력 송신단)

  • Kim, Sang-Hun;Uh, Ji-Hun;Jang, Young-Chan
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.490-492
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    • 2010
  • A swing level controlled voltage-mode transmitter is proposed to support a stub series-terminated logic channel with center-tapped termination. This transmitter provides a swing level control to support the diagnostic mode and improve the signal integrity in the absence of the destination termination. By using the variable parallel termination, the proposed transmitter maintains the constant output impedance of the source termination while the swing level is controlled. Also, the series termination using an external resistor is used to reduce the impedance mismatch effect due to the parasitic components of the capacitor and inductor. To verify the proposed transmitter, the voltage-mode driver, which provides eight swing levels with the constant output impedance of about $50{\Omega}$, was implemented using a 70nm 1-poly 3-metal DRAM process with a 1.5V supply. The jitter reduction of 54% was measured with the swing level controlled voltage-mode driver in the absence of the destination termination at 1.6-Gb/s.

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The Effect of Relationship Incompatibility on Relationship Termination Intention in B2B Transaction

  • LEE, Hyoungtark;YI, Ho-Tack;SON, Mikyoung
    • Journal of Distribution Science
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    • v.18 no.4
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    • pp.51-60
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    • 2020
  • Purpose: The purpose of this study is to derive a strategy to manage the relationship termination intention of the partner in a B2B transaction. To achieve this goal, the relationship compatibility was classified into goal incongruity, domain dissensus, perception difference, and verified the effects of these variables on relationship termination intention. Trust which is well known as a variable which develops the relationship and prevents relationship termination is used as a moderating variable in this study. This study identifies and highlights which relationship incompatibility increases relationship termination intention more when trust is high and when it is low. Research design, data, and methodology: The data of this study were obtained via an interview with 274 purchasing decision makers. Results: It was found that goal incongruity and domain dissensus increased the partner's relationship termination intention. Trust amplified the effect of goal incongruity which increased relationship termination intention, but reduced the effect of domain dissensus which increase relationship termination intention. Conclusions: Through this research, it has emerged that the relationship can be terminated because of high trust. If a partner has a high level of trust in the past in a company, it should take more care not to perceive goal incongruity.

Effects of Surface Termination on Directional Emission from Photonic Crystal Waveguides

  • Chung, K.B.
    • Journal of the Optical Society of Korea
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    • v.12 no.1
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    • pp.13-18
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    • 2008
  • We numerically investigate by the finite-difference time-domain method the effects of surface termination on directional emission exiting a photonic crystal waveguide. The directed power and far-field beam profile for the original proposal [E. Moreno et al., Phys. Rev. B 69, 121402 (2004)] and its enhancement [S. K. Morrison et al., Appl. Phys. Lett. 86, 081110 (2005)] are computed for different values of some important parameters. We find another surface termination condition with a positive surface displacement in the structure of the original proposal which has a negative surface displacement. Our surface termination is more effective than the original structure, and nearly as effective as the termination for the enhancement, for directional emission. Besides, our termination is simpler than that for the enhancement. We confirm the effectiveness of directional emission from our termination in its far-field beam profile, radiation intensity distribution, and additionally the wave-vector space representation by the Fourier analysis.

A New Junction Termination Structure by Employing Trench and FLR (Trench와 FLR을 이용한 새로운 접합 마감 구조)

  • 하민우;오재근;최연익;한민구
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.52 no.6
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    • pp.257-260
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    • 2003
  • We have proposed the junction termination structure of IGBT (Insulated Gate Bipolar Transistor) by employing trench and FLR (Field Limiting Ring), which decrease the junction termination area at the same breakdown voltage. Our proposed junction termination structure, trench FLR is verified by numerical simulator MEDICI. In 600V rated device, the junction termination area is decreased 20% compared with that of the conventional FLR structure. The breakdown voltage of trench FLR with 4 trenches is 768 V, 99 % of ideal parallel-plane junction(1-D) $BV_ceo$.

The Junction Termination Design Employing Shallow Trench and Field Limiting Ring for 1200 V-Class Devices (얕은 트렌치와 전계 제한 확산 링을 이용한 접합 마감 설계의 1200 V급 소자에 적용)

  • 하민우;오재근;최연익;한민구
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.53 no.6
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    • pp.300-304
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    • 2004
  • We have proposed the junction termination design employing shallow trench filled with silicon dioxide and field limiting ring (FLR). We have designed trenches between P+ FLRs to decrease the junction termination radius without sacrificing the breakdown voltage characteristics. We have successfully fabricated and measured improved breakdown voltage characteristics of the Proposed device for 1200 V-class applications. The junction termination radius of the proposed device has decreased by 15%-21% compared with that of the conventional FLR at the identical breakdown voltage. The junction termination area of the proposed device has decreased by 37.5% compared with that of the conventional FLR. The breakdown voltage of the proposed device employing 7 trenches was 1156 V, which was 80% of the ideal parallel-plane .junction breakdown voltage.

An Inclusive Method for Application of Combat Termination Rules (전투종료규칙의 포괄적 적용방법)

  • 백자성;하석태
    • Journal of the military operations research society of Korea
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    • v.26 no.1
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    • pp.125-144
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    • 2000
  • Occasionally, there are combat situations which one or both forces can´t terminate the combat using selected combat termination rule according to given relationship between ratio of attrition rate coefficient and threshold values. In this study, we classify the situations that one or both forces can´t terminate the combat with selected combat termination rule into four conditions. Condition${\circled1}$ is the situation which both Blue and Red can terminate the combat using all selected combat termination rules. condition${\circled2}$ and condition${\circled3}$ are those which neither Blue or Red can terminate the combat using selected proportional decision rule, and condition${\circled4}$ is that which both Blue and Red can´t terminate the combat using selected proportional decision rule. We analyze the effect of combat termination rules on parity number, final combat power, and combat durations for each conditions. Also, we propose the method to apply the analyzed effect of combat termination rules to combat analysis.

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DNA Light-strand Preferential Recognition of Human Mitochondria Transcription Termination Factor mTERF

  • Nam, Sang-Chul;Kang, Chang-Won
    • BMB Reports
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    • v.38 no.6
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    • pp.690-694
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    • 2005
  • Transcription termination of the human mitochondrial genome requires specific binding to termination factor mTERF. In this study, mTERF was produced in E. coli and purified by two-step chromatography. mTERF-binding DNA sequences were isolated from a pool of randomized sequences by the repeated selection of bound sequences by gel-mobility shift assay and polymerase chain reaction. Sequencing and comparison of the 23 isolated clones revealed a 16-bp consensus sequence of 5'-GTG$\b{TGGC}$AGANCCNGG-3' in the light-strand (underlined residues were absolutely conserved), which nicely matched the genomic 13-bp terminator sequence 5'-$\b{TGGC}$AGAGCCCGG-3'. Moreover, mTERF binding assays of heteroduplex and single-stranded DNAs showed mTERF recognized the light strand in preference to the heavy strand. The preferential binding of mTERF with the light-strand may explain its distinct orientation-dependent termination activity.

Investigation of carbon nanotube growth termination mechanism by in-situ transmission electron microscopy approaches

  • Kim, Seung Min;Jeong, Seojeong;Kim, Hwan Chul
    • Carbon letters
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    • v.14 no.4
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    • pp.228-233
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    • 2013
  • In this work, we report in-situ observations of changes in catalyst morphology, and of growth termination of individual carbon nanotubes (CNTs), by complete loss of the catalyst particle attached to it. The observations strongly support the growth-termination mechanism of CNT forests or carpets by dynamic morphological evolution of catalyst particles induced by Ostwald ripening, and sub-surface diffusion. We show that in the tip-growth mode, as well as in the base-growth mode, the growth termination of CNT by dissolution of catalyst particles is plausible. This may allow the growth termination mechanism by evolution of catalyst morphology to be applicable to not only CNT forest growth, but also to other growth methods (for example, floating-catalyst chemical vapor deposition), which do not use any supporting layer or substrate beneath a catalyst layer.

Electrical Insulation Design of a 154 kV Class HTS Cable and Termination (154 kV급 고온초전도 케이블 및 단말의 전기절연 설계)

  • Kwag, Dong-Soon;Cheon, Hyeon-Gweon;Choi, Jae-Hyeong;Kim, Hae-Jong;Cho, Jeon-Wook;Kim, Sang -Hyun
    • Progress in Superconductivity and Cryogenics
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    • v.9 no.1
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    • pp.61-66
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    • 2007
  • A transmission class high-temperature superconducting(HTS) power cable system is being developed in Korea. For insulation design of this cable the grading method of insulating paper is proposed. Two kinds of laminated polypropylene paper that has different thickness has been used as the electrical insulation material. The use of graded insulation gives improved mechanical bending properties of the cable. In a HTS cable technology the terminations are important components. A HTS cable termination is energized with the line-to-ground voltage between the coaxial center and outer surrounding conductors. in the axial direction. There is also a temperature difference from ambient to about 77 K. For insulation design of this termination, glass fiber reinforced plastic(GFRP) was used as the insulation material of the termination body, and the capacitance-graded method is proposed. This paper will report on the experimental investigations on impulse breakdown and surface flashover characteristics of the insulation materials for insulation design of a transmission class HTS power cable and termination. Based on these experimental data, the electrical insulation design of a transmission class HTS power cable and termination was carried out.