• 제목/요약/키워드: Capacitance design

검색결과 532건 처리시간 0.026초

Effect of Soft Error Rate on SRAM with Metal Plate Capacitance

  • Kim Do-Woo;Gong Myeong-Kook;Wang Jin-Suk
    • KIEE International Transactions on Electrophysics and Applications
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    • 제5C권6호
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    • pp.242-245
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    • 2005
  • We compared and analyzed ASER (Accelerated Soft Error Rate) for cell structures and metal plate capacitance in the fabricated 16M SRAM. Application of the BNW (Buried NWELL) lowered the ASER value compared to the normal well structure. By applying the metal plate capacitor with the BNW, the lowest ASER value can be obtained. The thinner oxide thickness of the metal plate capacitor provides higher capacitance and lower ASER value. The ASER is improved from 2200 FIT to 1000 FIT after sole application of the BNW. However, it is dramatically improved to 15 FIT once the metal plate capacitor is additionally applied.

고용량 MLCC의 전기적 특성에 관한 연구 (Study on the Electrical propertics of high capacitance Multilayer Ceramic Capacitor)

  • 김현덕;윤중락;김응권;송준태
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2005년도 하계학술대회 논문집 Vol.6
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    • pp.348-348
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    • 2005
  • High capacitance MLCC has been enabled through the use of nickel electrodes to produce thinner layers at acceptable costs. High capacitance MLCC devices offer significant advantages to electrolytics such as tantalum and aluminum ; Lower ESR for high frequency applications. Non-polarized. Many process improvement have enabled this technology Higher dielectric constants Thinner dielectric and electrode layers through BME More accurate layer construction. This study is high capacitance MLCC electrical propertics. reliability, Analysis on DOE(Design Of Experiment) of the electical propertics.

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PCB용 임베디드 캐패시터에 관한 연구 (A Study on the Embedded Capacitor for PCB)

  • 홍순관
    • 대한전자공학회논문지TE
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    • 제42권4호
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    • pp.1-6
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    • 2005
  • 최근 저항이나 캐패시터와 같은 수동소자를 PCB의 내층에 제조하는 임베디드 패시브 기술이 고성능의 IT 제품을 제조하는데 사용되고 있다. 그런데 임베디드 캐패시터는 정전용량 밀도가 낮아 회로소자로서의 전반적인 응용에 한계가 있다. 본 논문에서는 이러한 한계를 극복하기 위하여 wrinkle형의 전극과 유전체 층을 가진 새로운 임베디드 캐패시터를 제안하였다. FEM 기법을 사용하여 wrinkle형 임베디드 캐패시터의 정전용량 밀도를 평가하였다. Wrinkle형 임베디드 캐패시터는 기존의 평면형 임베디드 캐패시터에 비하여 25.6%$\sim$39.6% 정도 큰 정전용량 밀도를 나타내었다. 특히, thin film형 임베디드 캐패시터에 wrinkle 구조를 적용할 때 정전용량 밀도가 보다 많이 향상되었다.

Oil Film Thickness Measurement of Engine Bearing and Cam/tappet Contact in an Automotive Engine

  • Choi, Jae-Kwon;Min, Byung-Soon;Han, Dong-Chul
    • Tribology and Lubricants
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    • 제11권5호
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    • pp.71-77
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    • 1995
  • The capacitance technique was used to measure the minimum oil film thickness in engine bearing and the central oil film thickness between cam and tappet. This method is based on the measurement of total capacitance of oil film. For the measurement of the oil film thickness between cam and tappet, two surfaces were assumed to be flat and parallel within the Hertzian region and all the measured capacitance originated from this region. Shear rates from the measured minimum oil film thickness are over 10$^{6}$ sec$^{-1}$ in the greater part in both two cases. The minimum oil film thickness in engine bearing is larger than the surface roughness. Between cam and tappet it is mostly smaller than the surface roughness. In spite of the awkward restriction of the reliability of measured oil film thickness, it was known that the capacitance technique makes it possible to measure the oil film thickness in elastohydrodynamic and mixed lubrication regimes as well as in hydrodynamic regime. Therefore, it is also possible to classify the lubrication regimes based on the oil film thickness.

Monitoring the water absorption in GFRE pipes via an electrical capacitance sensors

  • Altabey, Wael A.;Noori, Mohammad
    • Advances in aircraft and spacecraft science
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    • 제5권4호
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    • pp.499-513
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    • 2018
  • One of the major problems in glass fiber reinforced epoxy (GFRE) composite pipes is the durability under water absorption. This condition is generally recognized to cause degradations in strength and mechanical properties. Therefore, there is a need for an intelligent system for detecting the absorption rate and computing the mass of water absorption (M%) as a function of absorption time (t). The present work represents a new non-destructive evaluation (NDE) technique for detecting the water absorption rate by evaluating the dielectric properties of glass fiber and epoxy resin composite pipes subjected to internal hydrostatic pressure at room temperature. The variation in the dielectric signatures is employed to design an electrical capacitance sensor (ECS) with high sensitivity to detect such defects. ECS consists of twelve electrodes mounted on the outer surface of the pipe. Radius-electrode ratio is defined as the ratio of inner and outer radius of pipe. A finite element (FE) simulation model is developed to measure the capacitance values and node potential distribution of ECS electrodes on the basis of water absorption rate in the pipe material as a function of absorption time. The arrangements for positioning12-electrode sensor parameters such as capacitance, capacitance change and change rate of capacitance are analyzed by ANSYS and MATLAB to plot the mass of water absorption curve against absorption time (t). An analytical model based on a Fickian diffusion model is conducted to predict the saturation level of water absorption ($M_S$) from the obtained mass of water absorption curve. The FE results are in excellent agreement with the analytical results and experimental results available in the literature, thus, validating the accuracy and reliability of the proposed expert system.

강유전체를 사용한 $90^{\circ}$ 하이브리드 구조의 위상 변위기 설계 (A design of $90^{\circ}$ hybrid phase shifter using ferroelectric materials)

  • 김영태;류한철;이수재;곽민환;문승언;김형석;박준석
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 C
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    • pp.1919-1921
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    • 2002
  • In this paper, we were designed the ferroelectric phase shifter using 3-dB, $90^{\circ}$ branch-line hybrid coupler with two ports terminated in symmetric phase-controllable reflective networks. The design of phase shifter is based on reflection theory of terminating circuits. In order to find the optimum conditions of reflect phase, the effect of a change of capacitance and transmission line connected with two coupled ports of a coupler have been investigated. To obtain more accurate design parameters, finite element method is applied. We were showed large phase variation with small capacitance variation in the parallel connection of capacitor and transmission line by using EM-simulation and circuit-simulation.

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Analysis and Design of a High Voltage Flyback Converter with Resonant Elements

  • Hong, Sung-Soo;Ji, Sang-Keun;Jung, Young-Jin;Roh, Chung-Wook
    • Journal of Power Electronics
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    • 제10권2호
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    • pp.107-114
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    • 2010
  • This paper presents the operational characteristics of a high voltage flyback converter with resonant elements. In high voltage low power applications, the effect of a transformer’s stray capacitance might be the most important factor that influences the overall performance of the circuit. A detailed mode analysis and the design procedure are presented in designing the high voltage flyback converter. To verify and confirm the validities of the presented analysis and design procedure, a computer simulation and experiments have been performed.

동위형 축전 센서가 장착된 자기베어링의 4 축 분산식 제어 (4-Axis Decentralized Control of Magnetic Bearing Equipped whth Collocatd Capacitance Sensor)

  • 신동원
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1996년도 춘계학술대회 논문집
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    • pp.336-340
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    • 1996
  • This paper presents the development of a collocated capacitance sensor and its application to the decentralized PID controller design for 4-axis magnetic bearing system. The main feature of the sensor is that it is made of a compact printed circuit board (PCB) so that it can be built in to the actuator coil of the magnetic bearing unit. The signal processing unit has been also developed. Then, decentralized PED controller is designed using simplified rotor system model. Finally, the experimental results on the performance of the collocated sensor based decentralized PID controller for a magnetic bearing rotor system is presented.

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MOSFET의 Intrinsie캐패시턴스가 도미노 논리회로에서의 전하 재분포에 미치는 영향 (The Effect of Intrinsic Capacitances of MOSFET's on the Charge Redistribution in Dynamic Gates)

  • 이병호;박성준;김원찬
    • 대한전자공학회논문지
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    • 제27권9호
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    • pp.1378-1385
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    • 1990
  • In this paper we propose a model which can predict well the logical errors come from the charge redistribution in domino gates. In this model the effect of the intrinsic capacitance between gate and channel of MOSFET's is considered. This effect is more important than the parasitic capacitance effect. The error by the proposed model is only 8% of that by the currently used model. This model can be used as a guide-line in the design of domino circuits.

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Design of a Highly Efficient Broadband Class-E Power Amplifier with a Low Q Series Resonance

  • Ninh, Dang-Duy;Nam, Ha-Van;Kim, Hyoungjun;Seo, Chulhun
    • Journal of electromagnetic engineering and science
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    • 제16권3호
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    • pp.143-149
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    • 2016
  • This work presents a method used for designing a broadband class-E power amplifier that combines the two techniques of a nonlinear shunt capacitance and a low quality factor of a series resonator. The nonlinear shunt capacitance theory accurately extracts the value of class-E components. In addition, the quality factor of the series resonator was considered to obtain a wide bandwidth for the power amplifiers. The purpose of using this method was to produce a simple topology and a high efficiency, which are two outstanding features of a class-E power amplifier. The experimental results show that a design was created using from a 130 to 180 MHz frequency with a bandwidth of 32% and a peak measured power added efficiency of 84.8%. This prototype uses an MRF282SR1 MOSFET transistor at a 3-W output power level. Furthermore, a summary of the experimental results compared with other high-efficiency articles is provided to validate the advantages of this method.