Home About us Contact
|
Home About us Contact | ||
|
|
||
Equivalent-circuit Model (equivalent-circuit + model)
Selected AbstractsDevelopment of 3-D equivalent-circuit modelling with decoupled L-ILU factorization in semiconductor-device simulationINTERNATIONAL JOURNAL OF NUMERICAL MODELLING: ELECTRONIC NETWORKS, DEVICES AND FIELDS, Issue 3 2007Szu-Ju Li Abstract In this paper, we develop a three-dimensional (3-D) device simulator, which combines a simplified, decoupled Gummel-like method equivalent-circuit model (DM) with levelized incomplete LU (L-ILU) factorization. These complementary techniques are successfully combined to yield an efficient and robust method for semiconductor-device simulation. The memory requirements are reduced significantly compared to the conventionally used Newton-like method. Furthermore, the complex voltage-controlled current source (VCCS) is simplified as a nonlinear resistor. Hence, the programming and debugging for the nonlinear resistor model is much easier than that for the VCCS model. Further, we create a connection-table to arrange the scattered non-zero fill-ins in sparse matrix to increase the efficiency of L-ILU factorization. Low memory requirements may pave the way for the widespread application in 3-D semiconductor-device simulation. We use the body-tied silicon-on-insulator MOSFET structure to illustrate the capability and the efficiency of the 3-D DM equivalent-circuit model with L-ILU factorization. Copyright © 2007 John Wiley & Sons, Ltd. [source] Analysis and characterization of package resonanceINTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 1 2005El-Badawy El-Sharawy Abstract This article presents FDTD analysis and prediction of the overall effects of the resonance in ceramic and plastic packages. Practical structures that result in strong resonance effects are investigated, such as coupled cross lines with a via transition and multiple via transitions on a single line. A detailed study of the mutual coupling, including resonance effects, is also performed and presented. The results of the analysis indicate that the package performance can be very sensitive to the resonance effects. A broadband equivalent-circuit model for multiple transition discontinuities (two via holes) on a single line has been developed and presented. Good agreement between the frequency response of the FDTD and the circuit models has been achieved over a broad band of frequencies. The analysis presented in this article provides insight about the limits at which coupling effects on the overall package performance can be neglected. The equivalent-circuit model presented in this article can greatly simplify the analysis and simulation of a complex package, including several transition discontinuities, assuming that the coupling is small. © 2004 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2005. [source] Miniaturized band-stop filter based on multilayer-technique and new coupled octagonal defected ground structure with interdigital capacitorMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2010A. Boutejdar Abstract In this article, we proposed a new compact defected ground structure (DGS) band-stop filter with broad passband and low insertion loss in the stop-band. The philosophy of the structure behind this new microstrip band-stop filter is simple as it is composed of a pair of octagonal DGS-slots and an open-stub as compensated microstrip capacitance. The filter will be realized through direct electromagnetic coupling and slow wave effect methods. With this configuration, the BSF with higher compactness, broad passband and sharp transition characteristics was realized. The design formulas are derived by using an equivalent-circuit model of a parallel L - C resonator. Finally, an interdigital-capacitor has been designed and included in the DGS-ring-element. Better compactness of the structure and symmetry of the frequency response have been achieved as well as two reflection zeros closed to the stopband have been obtained. Thus, a selectivity of the proposed filter has been improved. To validate the feasibility of the proposed design method, both band-stop filters are designed, fabricated, and measured. The experimental results agree well with the simulation results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 510,514, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24967 [source] Analysis and equivalent circuit of aperture-coupled cavity-fed microstrip patch antennaMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2006Jeong Phill Kim Abstract A simple but accurate equivalent circuit of an aperture-coupled cavity-fed microstrip patch antenna is developed. It consists of ideal transformers, admittance elements, and transmission lines, and the related circuit-element values are computed by applying the reciprocity theorem and complex power concept with the spectral-domain immittance approach. The antenna input impedance calculated from network theory is compared with the measured data, and their good agreement validates the simplicity and accuracy of the proposed equivalent-circuit model. Based on the proposed theory, the effect of structural parameters on the antenna characteristics is also examined. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 843,846, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21493 [source] Microstrip stepped-impedance hairpin resonator low-pass filter with defected ground structureMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2006Ju-Hyun Cho Abstract In this paper, a new microstrip stepped-impedance hairpin resonator (SIR) low-pass filter (LPF) using a defected ground structure (DGS) is proposed. The proposed SIR hairpin low-pass filter using DGS provides a very sharp cutoff frequency response with low insertion loss. Furthermore, the SIR hairpin low-pass filter can provide attenuation poles for the wide-stopband characteristic due to the resonance characteristic of the DGS. Design parameters for the SIR low-pass filter are derived based on stepped-impedance theory and the equivalent-circuit model for the DGS. The experimental results show excellent agreement with the theoretical simulation results. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 405,408, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21364 [source] A small-signal equivalent-circuit model of quantum-well lasers based on three-level rate equationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2001Gao Jianjun Abstract An intrinsic equivalent-circuit model for quantum-well lasers is presented. The model is based on the three-level rate equations, and includes the carrier transport effects and the role of the gateway state at the quantum well. The simulation results of the frequency response are compared with experimentally obtained data, and agreement is obtained consistently on separate confinement heterostructures (SCHs) of different sizes. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 270,271, 2001. [source] Uniplanar four-element Vivaldi array fed by a coplanar waveguideMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2001I. Linardou Abstract This letter describes the design of a uniplanar parallel-series-fed linear array of Vivaldi antennas. Matching conditions have been optimized with an equivalent-circuit model. The array exhibits 12dBi gain in the substrate plane, 80% radiation efficiency, and low cross polarization over 5% bandwidth centered at 4.2GHz. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 60,62, 2001. [source] | ||||||||||