• Title/Summary/Keyword: Passive elements

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Current-Mode Electronically Tunable Universal Filter Using Only Plus-Type Current Controlled Conveyors and Grounded Capacitors

  • Minaei, Shahram;Turkoz, Sait
    • ETRI Journal
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    • v.26 no.4
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    • pp.292-296
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    • 2004
  • In this paper we present a new current-mode electronically tunable universal filter using only plus-type current controlled conveyors (CCCII+s) and grounded capacitors. The proposed circuit can simultaneously realize lowpass, bandpass, and highpass filter functions - all at high impedance outputs. The realization of a notch response does not require additional active elements. The circuit enjoys an independent current control of parameters $\omega_0$ and $\omega_0/Q$. No element matching conditions are imposed. Both its active and passive sensitivities are low.

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Sinusoidal, Pulse, Triangular Oscillator Using Second Generation Current Conveyor

  • Choi, Jin-Ho
    • Journal of information and communication convergence engineering
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    • v.8 no.5
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    • pp.566-569
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    • 2010
  • This paper describes the sinusoidal, pulse, triangular oscillator using second generation current conveyor. To obtain the sinusoidal waveform the circuit blocks are constructed by using all pass filter and integrator. The pulse and the triangular waveforms are obtained from the output of sinusoidal oscillator. The peak-to-peak voltages of sinusoidal and triangular waveforms can be easily controlled by the dc offset voltage. Also the output frequency of the oscillator can be controlled by varying passive elements. The designed circuit is verified by HSPICE simulation.

An Active-Only Voltage-Mode Integrator and Its Applications

  • Shinji, Ohyama;Kim, Doh-Hyun
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.158.4-158
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    • 2001
  • This paper presents a novel circuit configuration for realizing the continuous-time active-only voltage-mode integrator. The proposed integrator consists only of internally compensated type operational amplifier (OA) and operational transconductance amplifiers (OTAs). Since no external passive elements are required, the integrator is suitable for integrated circuit implementation in either bipolar or CMOS technologies. Moreover, the integrator gain can be electronically tuned by adjusting the bias currents of the OTAs. The characteristics of the proposed integrator and the effectiveness of the design procedure in realizing various analog transfer functions have been examined by PSPICE simulation.

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A SPICE SIMULATION FOR A ZVS CMOS DC/DC CONVERTER (ZVS를 사용한 저전압 CMOS 고집적회로 DC/DC 컨버터의 SPICE 시뮬레이션)

  • 전재훈;김종태
    • Proceedings of the IEEK Conference
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    • 1999.11a
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    • pp.259-262
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    • 1999
  • This paper presents the design of highly efficient one-chip CMOS DC/DC converter. The converter operates at the switching frequency of 1MHz for reducing the size of passive elements. And use the zero voltage switching(ZVS) for minimizing switching loss at high frequency. The simulation shows that the circuit can achieve a 95% efficiency while delivering a load of 1W at 2V output.

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A Simulation Model of the ACL Function Using MADYMO (마디모를 이용한 전방십자인대 기능 시뮬레이션 모델)

  • Park, Jung-Hong;Son, Kwon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.30 no.11 s.254
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    • pp.1408-1416
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    • 2006
  • A mathematical knee model was constructed using MADYMO. The purpose of this study is to present a more realistic model of the human knee to reproduce human knee motion. Knee ligaments were modeled as line elements and the surrounding muscles were considered as passive restraint elements. A calf-free-drop test was performed to validate the suggested model. A calf was dropped from the rest at about 65 degree flexed posture in the prone position. The motion data were recorded using four video cameras and then three dimensional data were acquired by Kwon3D motion analysis software. The results showed that general shapes of angular quantities were similar in both the experiment and computer simulation. Functional stability of the anterior cruciate ligament was explicitly revealed through this model.

Effects of Alloying Elements on the Surface Characteristics of Fe-38Al Intermetallic Compounds (Fe-38 at.% Al계 금속간화합물의 표면특성에 미치는 합금원소의 영향)

  • 최한철
    • Journal of the Korean institute of surface engineering
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    • v.37 no.2
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    • pp.128-136
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    • 2004
  • Effects of alloying elements on the surface characteristics of Fe-38Al intermetallic compounds were investigated using potentiostat. The specimens were casted by the vacuum arc melting. The subsequent homogenization and the stabilization led to the homogeneous DO$_3$ structure of the specimen. After the corrosion tests, the surface of the tested specimen was observed by the optical microscopy and scanning electron microscopy(SEM). For Fe-38 at.% Al intermetallic compound, the addition of Cr and Mo proved to be beneficial in decreasing the grain boundary attack by decreasing the active current density. Addition of Band Nb resulted in a higher active current density and also a higher passive current density. These results indicated the role of Cr and Mo in improving the pitting corrosion resistance of Fe-38 at.%Al intermetallic compound. Band Nb addition to Fe-38 at.%Al accelerated the granular corrosion. Fe-38 at.%Al containing Cr and Mo showed remarkably improved pitting corrosion resistance in comparison with Band Nb addition to Fe-38 at. %Al.

An Effective Pedagogical Method for Nodal Analysis in Linear Circuit (선형회로에서 마디해석법의 효과적인 교수법)

  • Kim, Gwang Won;Hyun, Seung-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.7
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    • pp.76-81
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    • 2013
  • This paper presents an effective pedagogical method for nodal analysis in linear circuit. In the proposed method, basic equations are built only for passive elements and independent current sources. And then, the basic equations are modified by considering other sources such as voltage sources and dependent current sources. In the proposed method, the equations are presented in form of a matrix and a vector of which elements are built systematically by considering every element in a circuit one by one. This make the proposed method easy to apply to intricately composed circuit and easy to solve the final simultaneous equations and easy to realize as computer program for nodal analysis and easy to memorize compared to the conventional method.

Derivation and Application of the Green Plan Factors Inherent in the Existing Old Settlements in Local City - Focused on Topdong 'Yangdalmal' - (지방 도시의 옛마을 관련 친환경 계획요소의 추출 및 적용검토 - 청주 탑동 '양달말'을 대상으로-)

  • Chae, Su-Min;Byun, Kyeong Hwa;Kim, Tai Young
    • Journal of the Korean Institute of Rural Architecture
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    • v.14 no.1
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    • pp.115-124
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    • 2012
  • The purpose of this study is to derive and to apply green factors focusing on the existing old settlements, Topdong 'Yangdalmal' in Cheongju City. This study is conducted through literatures and GBCC (Green Building Certification Criteria) review. Literatures cover the traditional characteristics of farming village and the modern characteristics of urban space today. The results are following as; first, Land Use, Environment, Resource and Energy are the most important green factors by literatures and GBCC. Second, traditional elements and natural elements such as history and culture, natural resource use and passive planning are added. Finally information communication is added as the green factor showed feature of modern society.

A Study on the visco-plastic behavior of the jointed rock mass reinforced by rockbolts during excavation (굴착과정에서 록볼트로 보강된 절리암반의 점소성 거동 분석)

  • 이연구;이정인;조태진
    • Tunnel and Underground Space
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    • v.5 no.2
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    • pp.123-133
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    • 1995
  • A two dimensional visco-plastic finite element model capable of handling the multistep excavaton was developed for investigating the effect of excavation-support sequences on the behaviour of underground openings in the jointed rock mass. Ubiquitous joint pattern was considered in the model and joint properties in each set were assumed to be identical. Passive, fully-grouted rockbolts were considered in the model. Visco-plastic deformations of joints and rockbolts were assumed to be governed by Mohr-Coulomb and von Mises yield criteria, respectively. With the ability of removing elements, the model can von Mises yield criteria, respectively. With the ability of removing elements, the model can simulate the multi-step excavation-support sequences. The reliability of the model to the stability analysis for the underground excavation in practice was checked by simulating the behavior of underground crude oil storage caverns under construction.

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The Application of the Simple System Model Analysis to the Housewives분 Study (단순체계모델의 단순기능분석을 적용한 주부연구의 쟁점)

  • 김선미;송혜림;이승미
    • Journal of Family Resource Management and Policy Review
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    • v.5 no.1
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    • pp.141-150
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    • 2001
  • This study applicates one of the five elaborated functional analyses of Piotr Stztompka to the housewives’study. The four general assumptions of plurality, wholeness, integration and boundary of the simple system issue the eight specific solutions; reciprocity, exploitation, consensus, conflict, dependence, autonomy, isolation and structural context of the relationships among the various elements of the system. From the eight specific assumptions of the housewives’studies, we have found that many managerial subsystem studies see the housewives’relationships to other elements in their reciprocity, concensus, dependence and isolation characteristics. If the assumptions of autonomy and structual context are used to this kind of study, we can understand the housewives’problem and potential but as an active subject of their humanlives, not as a simply passive primary manager of the family, and we can find a new concept of the development to change the housewives’quality of life.

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