The Experts below are selected from a list of 33336 Experts worldwide ranked by ideXlab platform

Woo-young Choi - One of the best experts on this subject based on the ideXlab platform.

  • a linear Equivalent Circuit Model for depletion type silicon microring modulators
    IEEE Transactions on Electron Devices, 2017
    Co-Authors: Myungjin Shin, Byungmin Yu, Jinsoo Rhim, Lars Zimmermann, Woo-young Choi
    Abstract:

    We present a linear Equivalent Circuit Model for the depletion-type Si microring modulator (MRM). Our Model consists of three blocks: one for parasitic components due to interconnects and pads, one for the electrical elements of the core p-n junction, and the third for a lossy LC tank representing Si MRM optical modulation characteristics. Model parameter values are extracted from measurement of a fabricated Si MRM device. Simulated modulation characteristics with our Equivalent Circuit show very good agreement with measured results. Using our Model, we can analyze Si MRM modulation frequency response characteristics and perform gain-bandwidth product optimization of the entire Si photonic transmitter composed of a Si MRM and electrical driver Circuits.

  • Equivalent Circuit Model for si avalanche photodetectors fabricated in standard cmos process
    IEEE Electron Device Letters, 2008
    Co-Authors: Hyo-soon Kang, Woo-young Choi
    Abstract:

    We present an Equivalent Circuit Model for CMOS-compatible avalanche photodetectors. The Equivalent Circuit Model includes an inductive component for avalanche delay, a current source for photogenerated carriers, and several components that Model the device structure and parasitic effects. The Model provides accurate impedance characteristics and photodetection frequency responses.

  • Equivalent Circuit Model for Si Avalanche Photodetectors Fabricated in
    2008
    Co-Authors: Hyo-soon Kang, Woo-young Choi
    Abstract:

    We present an Equivalent Circuit Model for CMOS- compatible avalanche photodetectors. The Equivalent Circuit Model includes an inductive component for avalanche delay, a cur- rent source for photogenerated carriers, and several components that Model the device structure and parasitic effects. The Model provides accurate impedance characteristics and photodetection frequency responses.

Chenming Hu - One of the best experts on this subject based on the ideXlab platform.

  • frequency independent Equivalent Circuit Model for on chip spiral inductors
    IEEE Journal of Solid-state Circuits, 2003
    Co-Authors: R A Groves, N D Zamdmer, Jeanolivier Plouchart, R A Wachnik, Xuejue Huang, Tsujae King, Chenming Hu
    Abstract:

    A wide-band physical and scalable 2-/spl Pi/ Equivalent Circuit Model for on-chip spiral inductors is developed. Based on physical derivation and Circuit theory, closed-form formulas are generated to calculate the RLC Circuit elements directly from the inductor layout. The 2-/spl Pi/ Model accurately captures R(f) and L(f) characteristics beyond the self-resonant frequency. Using frequency-independent RLC elements, this new Model is fully compatible with both ac and transient analysis. Verification with measurement data from a SiGe process demonstrates accurate performance prediction and excellent scalability for a wide range of inductor configurations.

  • frequency independent Equivalent Circuit Model for on chip spiral inductors
    Custom Integrated Circuits Conference, 2002
    Co-Authors: R A Groves, N D Zamdmer, Jeanolivier Plouchart, R A Wachnik, Xuejue Huang, Tsujae King, Chenming Hu
    Abstract:

    A wide-band, physical and scalable 2-/spl Pi/ Equivalent Circuit Model for on-chip spiral inductors is developed. Using frequency-independent RLC elements, it accurately captures R(f) and L(f) characteristics beyond the self-resonant frequency. This new Model is fully compatible with both AC and transient analysis. Verification with measurement data demonstrates excellent scalability for a wide range of inductor configurations.

Qiang Li - One of the best experts on this subject based on the ideXlab platform.

  • a simplified Equivalent Circuit Model of series resonant converter
    IEEE Transactions on Power Electronics, 2016
    Co-Authors: Shuilin Tian, Qiang Li
    Abstract:

    Equivalent Circuit Models are useful design tools for control and have already well served their purposes in pulse width modulation dc–dc converters. However, no simple Equivalent Circuit Model is available yet for resonant-type dc–dc converters. Up to now, the most successful Equivalent Circuit Model of series resonant converter (SRC) is based on extended describing function concept, which was proposed by Yang et al. [30]. However, the Equivalent Circuit is a complicated fifth order with the cross-coupling effect and no analytical solution is provided for transfer functions. This paper proposes a simple third-order Equivalent Circuit Model of SRC. The Equivalent Circuit Model is derived by simplification of the original fifth-order Equivalent Circuit, based on the fact that the resonant capacitor behaves like an Equivalent resonant inductor with respect to the modulation frequency. The Equivalent Circuit Model can predict the dynamic behavior very well when the switching frequency is below, close to, or above the resonant frequency. Furthermore, for the first time, analytical expressions of all transfer functions, i.e., control-to-output, input-to-output, output impedance, and input impedance are provided. These analytical transfer functions will serve as a useful tool for the feedback design. The Equivalent Circuit Model is verified by Simplis simulation and experimental results.

  • unified Equivalent Circuit Model and optimal design of v 2 controlled buck converters
    IEEE Transactions on Power Electronics, 2016
    Co-Authors: Shuilin Tian, Qiang Li
    Abstract:

    $V^{2}$ control has advantages of simple implementation and fast transient response and is widely used in industry for point-of-load applications. This control scheme is elegant when output capacitors with large RC time constant are employed, such as OSCON capacitors. However, in most cases using capacitors with small RC time constant, such as ceramic capacitors, instability problem will occur. Previous Modeling methods including sampled-data Modeling, discrete-time analysis, time-domain analysis, and describing function are all very mathematical and difficult to apply for practical engineers as little physical insight can be extracted. Up to now, no Equivalent Circuit Model is proposed which is able to predict the instability issue and serve as a useful design tool for $V^{2}$ control. This paper proposes a unified Equivalent Circuit Model which is applicable to all types of capacitors by considering the effect of capacitor voltage ripple. The Equivalent Circuit provides the physical insight of $V^{2}$ control as a nonideal voltage source, a dual concept of previous nonideal current source for current-mode control. The Equivalent Circuit Model is a simple yet accurate complete Model and is very helpful for design purpose. Optimal design guidelines for point-of-load applications are provided. The proposed Equivalent Circuit Model is applicable to both variable frequency modulation and constant frequency modulation. The Equivalent Circuit Model and design guidelines are verified with Simplis simulation and experimental results.

  • small signal Equivalent Circuit Model of series resonant converter
    European Conference on Cognitive Ergonomics, 2015
    Co-Authors: Shuilin Tian, Qiang Li, Bin Li
    Abstract:

    A simple third-order Equivalent Circuit Model of series resonant converter (SRC) is proposed in this paper. Up to now, the most successful Equivalent Circuit Model of SRC is based on extended describing function concept, which is proposed by Dr. E. Yang [30]. However, the Equivalent Circuit is a complicated fifth-order Circuit with the cross-coupling effect and no analytical solution is provided for transfer functions. This paper proposes a methodology to simplify the fifth-order Equivalent Circuit to a third-order Equivalent Circuit. The Equivalent Circuit Model can predict the dynamic behavior very well when switching frequency is below, close to or above resonant frequency. Furthermore, for the first time, analytical expressions of transfer functions are provided to serve as a useful tool for feedback design. The Equivalent Circuit Model is verified by Simplis simulation and experimental results.

Shuilin Tian - One of the best experts on this subject based on the ideXlab platform.

  • a simplified Equivalent Circuit Model of series resonant converter
    IEEE Transactions on Power Electronics, 2016
    Co-Authors: Shuilin Tian, Qiang Li
    Abstract:

    Equivalent Circuit Models are useful design tools for control and have already well served their purposes in pulse width modulation dc–dc converters. However, no simple Equivalent Circuit Model is available yet for resonant-type dc–dc converters. Up to now, the most successful Equivalent Circuit Model of series resonant converter (SRC) is based on extended describing function concept, which was proposed by Yang et al. [30]. However, the Equivalent Circuit is a complicated fifth order with the cross-coupling effect and no analytical solution is provided for transfer functions. This paper proposes a simple third-order Equivalent Circuit Model of SRC. The Equivalent Circuit Model is derived by simplification of the original fifth-order Equivalent Circuit, based on the fact that the resonant capacitor behaves like an Equivalent resonant inductor with respect to the modulation frequency. The Equivalent Circuit Model can predict the dynamic behavior very well when the switching frequency is below, close to, or above the resonant frequency. Furthermore, for the first time, analytical expressions of all transfer functions, i.e., control-to-output, input-to-output, output impedance, and input impedance are provided. These analytical transfer functions will serve as a useful tool for the feedback design. The Equivalent Circuit Model is verified by Simplis simulation and experimental results.

  • unified Equivalent Circuit Model and optimal design of v 2 controlled buck converters
    IEEE Transactions on Power Electronics, 2016
    Co-Authors: Shuilin Tian, Qiang Li
    Abstract:

    $V^{2}$ control has advantages of simple implementation and fast transient response and is widely used in industry for point-of-load applications. This control scheme is elegant when output capacitors with large RC time constant are employed, such as OSCON capacitors. However, in most cases using capacitors with small RC time constant, such as ceramic capacitors, instability problem will occur. Previous Modeling methods including sampled-data Modeling, discrete-time analysis, time-domain analysis, and describing function are all very mathematical and difficult to apply for practical engineers as little physical insight can be extracted. Up to now, no Equivalent Circuit Model is proposed which is able to predict the instability issue and serve as a useful design tool for $V^{2}$ control. This paper proposes a unified Equivalent Circuit Model which is applicable to all types of capacitors by considering the effect of capacitor voltage ripple. The Equivalent Circuit provides the physical insight of $V^{2}$ control as a nonideal voltage source, a dual concept of previous nonideal current source for current-mode control. The Equivalent Circuit Model is a simple yet accurate complete Model and is very helpful for design purpose. Optimal design guidelines for point-of-load applications are provided. The proposed Equivalent Circuit Model is applicable to both variable frequency modulation and constant frequency modulation. The Equivalent Circuit Model and design guidelines are verified with Simplis simulation and experimental results.

  • small signal Equivalent Circuit Model of series resonant converter
    European Conference on Cognitive Ergonomics, 2015
    Co-Authors: Shuilin Tian, Qiang Li, Bin Li
    Abstract:

    A simple third-order Equivalent Circuit Model of series resonant converter (SRC) is proposed in this paper. Up to now, the most successful Equivalent Circuit Model of SRC is based on extended describing function concept, which is proposed by Dr. E. Yang [30]. However, the Equivalent Circuit is a complicated fifth-order Circuit with the cross-coupling effect and no analytical solution is provided for transfer functions. This paper proposes a methodology to simplify the fifth-order Equivalent Circuit to a third-order Equivalent Circuit. The Equivalent Circuit Model can predict the dynamic behavior very well when switching frequency is below, close to or above resonant frequency. Furthermore, for the first time, analytical expressions of transfer functions are provided to serve as a useful tool for feedback design. The Equivalent Circuit Model is verified by Simplis simulation and experimental results.

R A Groves - One of the best experts on this subject based on the ideXlab platform.

  • frequency independent Equivalent Circuit Model for on chip spiral inductors
    IEEE Journal of Solid-state Circuits, 2003
    Co-Authors: R A Groves, N D Zamdmer, Jeanolivier Plouchart, R A Wachnik, Xuejue Huang, Tsujae King, Chenming Hu
    Abstract:

    A wide-band physical and scalable 2-/spl Pi/ Equivalent Circuit Model for on-chip spiral inductors is developed. Based on physical derivation and Circuit theory, closed-form formulas are generated to calculate the RLC Circuit elements directly from the inductor layout. The 2-/spl Pi/ Model accurately captures R(f) and L(f) characteristics beyond the self-resonant frequency. Using frequency-independent RLC elements, this new Model is fully compatible with both ac and transient analysis. Verification with measurement data from a SiGe process demonstrates accurate performance prediction and excellent scalability for a wide range of inductor configurations.

  • frequency independent Equivalent Circuit Model for on chip spiral inductors
    Custom Integrated Circuits Conference, 2002
    Co-Authors: R A Groves, N D Zamdmer, Jeanolivier Plouchart, R A Wachnik, Xuejue Huang, Tsujae King, Chenming Hu
    Abstract:

    A wide-band, physical and scalable 2-/spl Pi/ Equivalent Circuit Model for on-chip spiral inductors is developed. Using frequency-independent RLC elements, it accurately captures R(f) and L(f) characteristics beyond the self-resonant frequency. This new Model is fully compatible with both AC and transient analysis. Verification with measurement data demonstrates excellent scalability for a wide range of inductor configurations.