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Effects of Impurity Concentration in Channel of LDMOSFET on the Electrical Characteristics of CMOS Circuit (LDMOSFET에서 채널의 불순물 농도변화에 의한 CMOS회로의 전기적 특성)

  • Cui, Zhi-Yuan;Kim, Nam-Soo;Lee, Hyung-Gyoo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.07a
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    • pp.11-12
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    • 2005
  • 2 차원 MEDICI 시뮬레이터를 이용하여 CMOS 회로의 전기적 특성을 조사하였다. CMOS 인버터 회로는 LDMOSFET를 이용하였는데, LDMOSFET에서 전류 및 스위칭 특성에 많은 영향을 주는 곳은 채널이라고 생각되는데, 채널에서의 불순물 농도 변화에 의한 CMOS 회로의 voltage transfer특성, low input voltage($V_{IL}$), high input voltage($V_{IH}$)등을 조사하였다. LDMOSFET에서 N 채널의 농도는 $V_{IL}$에, P 채널의 농도는 $V_{IH}$에 많은 영향을 주었다.

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Power Flow and Efficiency of Input Coupled type CVT combined Differential Gear Unit (차동기어장치를 적용한 입력축 연결방식 무단변속기의 동력흐름 및 효율해석에 관한 연구)

  • Kim, Yeon-Su;Choi, Sang-Hoon
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.11
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    • pp.141-150
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    • 2000
  • Continuously variable transmission(CVT) combined differential gear unit has many advantages, which are the decrease of CVT size, the increase of overall efficiency, the extension of speed ratio range, and the generation of geared neutral. It is known that such CVT can be classified into the input coupled type and the output coupled type according to the coupling location of continuously variable unit(CVU). In this paper, six different configurations of input coupled type CVT combined V-belt CVU and 2K-H I type differential gear unit are proposed. Some useful theoretical formula related to speed ratio, power flow and efficiency are derived and analyzed. The propriety of derived formula and theoretical analysis are proven by various experiments.

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A method of approximating spring characteristic and its application to the problem of balancing input torques (스프링특성의 근사법과 입력토오크 평형문제에의 응용)

  • 신재균
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.12 no.5
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    • pp.1026-1034
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    • 1988
  • An efficient method for designing balancing springs to be used for dynamic balancing of planar mechanisms was studied. In spite of its wide application in the field of balancing problems such as balancing of input torques, clearance effects etc., there have been few efficient ways of determining the specifications of the balancing springs. To improve this problem, a method of approximating the characteristic of linear springs was suggested and its validity was checked through an analysis of errors. Further, through an example of a balancing problem to reduce the fluctuation of input torques of a 4bar mechanism, it was shown that the proposed method of approximation simplifies the design equations and a satisfactory result can be found efficiently.

The Study on Interrelationship Analysis of Domestic Road Using PSD (PSD선도를 이용한 국내노면의 상관성 분석에 관한 연구)

  • Kim, Chan-Jung;Kwon, Seong-Jin;Lee, Bong-Hyun;Kim, Hyun-Chul;Bae, Chul-Yong
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.16 no.8 s.113
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    • pp.806-813
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    • 2006
  • An important factor of vibration test using MAST(multi axial simulation table) system is the reliance of input excitation source. Generally the generation of input excitation source is obtained by the measured data on special road in proving ground. The measured data on special road have more exciting energy than the data of real fields, therefore the time and expense for test can be reduced. But the magnitude of input excitation source must be defined by comparison with the excited energy on real field. The object of this paper makes the data base of domestic roads for the definition of input excitation source which is obtained by the measured data on special road in proving ground. These real field data on domestic roads are analyzed by the power spectral density and interrelationship index.

Design of Single-Input Single-Output Positive Position Feedback Controller For the Control of Multiple Modes (다중모드제어를 위한 단일 입출력 양변위 되먹임제어기의 설계)

  • Jeong, Moon-San;Kwak, Moon-K.;Lee, Myung-Il
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.11a
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    • pp.310-313
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    • 2005
  • This paper is concerned with the active vibration control of beam equipped with piezoceramic sensors and actuators. The single-input and single-output positive position feedback controller is considered as an active vibration controller for the beam. The proposed single-input and single-output positive position feedback controller can cope with many modes of interest by summing each positive position feedback controller designed for each mode. In this paper, theoretical formulation is first explained in detail. We discuss how to design the single-input and single-output positive position feedback controller for a target structure by considering Euler-Bemoulli beam. It is found that the theories developed in this study are capable of predicting the control system characteristics and its performance.

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Reduction of Residual Vibration in Wafer Positioning System Using Input Shaping (입력성형을 통한 웨이퍼 이송장치의 잔류진동 감쇠)

  • Yim, Jae-Chul;Ahn, Tae-Kil;Cho, Jung-Keun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.11a
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    • pp.559-563
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    • 2005
  • The wafer positioning robot used in the semiconductor industry is required to operate at high speed for the improvement of productivity. However, the residual vibration produced by the high speed of the wafer positioning robot makes the life of the robot shorter and the cycle time longer. In this study, the input shaping and the path of the system are designed for the reduction of the residual vibration and the optimization of the cycle time. The followings are the process for the reduction and the optimization; 1)System modeling of wafer positioning robot, 2)Verification of dynamic characteristic of wafer positioning robot, 3)Input shaping plan using impulse response reiteration, 4)Simulation test using simulink, 6)Analysis of result.

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Precise Position Control of Inchworm Using Robust Control Technique and Input Shaping (강인제어 기법과 입력성형법을 이용한 자벌레의 정밀 위치 제어)

  • Yang, Kwang-Yong;Hwang, Yun-Sik;Kim, Yeung-Shik;Kim, In-Soo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.19 no.2
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    • pp.169-175
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    • 2009
  • This paper presents motion control of the Inchworm composed of the piezoelectric actuators and mechanical elements. Piezoelectric actuator shows nonlinear response characteristics including hysteresis due to the ferroelectric characteristics. This paper proposes feedback control scheme to improve the ability of tracking response to complex input signal and suppress the phenomenon of hysteresis using the sliding mode control technique with the integrator. The sliding mode control system has the limit to minimize both the settle time and overshoot. For making up this limit, this paper also suggests input shaping technique suitable to the inchworm control system.

A Study of Improvement on the Torsional Vibration of Input Shaft and Structural Vibration of Vehicle Using Tunable Dual Stiffness Type Clutch in Auto-transmission (자동변속기에서 2중 동조 강성형 클러치를 이용한 입력축의 비틀림 진동 및 차체 진동의 개선에 관한 연구)

  • Jung, Byung-Hwan;Hwang, Seon-Yang;Kang, Koo-Tae
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.10
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    • pp.883-890
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    • 2010
  • According to torsional vibration characteristic of a tunable dual stiffness type clutch(TDSTC) in auto-transmission, the input shaft system have occurred breakdown for the duration cycle and over-vibration happened on vehicle at specific condition. This paper introduces the improvement of the torsional vibration of input shaft and the vehicle vibration by tuning of the TDSTC.

Reduction of the Residual Vibrations of a Flexible Cantilever Beam Subjected to a Transient Translation or Rotation Motion (병진 또는 회전하여 위치 이동하는 유연 외팔보의 잔류진동 저감 방법)

  • Shin, Ki-Hong
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.1
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    • pp.3-10
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    • 2008
  • In this paper, the optimal command input is considered in order to minimize the residual vibrations of a flexible cantilever beam when the beam simply changes its position by translation or rotation. Although a cantilever beam has many modes of vibration, it is shown that the consideration of the first mode is sufficient in this case. Thus, the problem becomes a single-degree-of-freedom system subjected to a ground excitation. Two simple methods are proposed to find the optimal command input based on the shock response spectrum (SRS). The first method is the simplest and can be applied to lightly damped cases, and the second method is applicable to more general problems. The second method gives almost the same results as the input shaping method. However the proposed method gives a easier and clearer control strategy.

Active Vibration Control Using Saturated LQR Controller (포화 LQR 제어기를 이용한 능동 진동 제어)

  • Lim, Chae-Wook
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.11
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    • pp.1105-1110
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    • 2008
  • In this paper, a saturated LQR controller considering control input's saturation for stable linear time-invariant systems with single control input is studied. Based on Lyapunov stability, two linear matrix inequality sufficient existence conditions for this controller are presented. Through numerical simulations for 2DOF vibrating system, it is confirmed that the saturated LQR controller is stable in the presence of control input's saturation and it is also shown that this controller can be applied to vibrating system practically.