Search query: simplis ic model

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abstract: This paper introduces some most recent results in a research project that aims at developing computer simulation models of integrated circuit (IC) controller chips inside switch mode power supplies. These models play a very important role to smooth operation of the electronic design verification test (eDVT) system. Based on engineering practice, the challenges to model power supply controllers are discussed and some strategies and methodology for such modeling activities in SIMPLIS environment are proposed in this paper. The way to model NCP1230A, an IC controller delivered by ON Semiconductor, is taken as an example to show the modeling process. Simulation waveforms of several established models and the related experimental results are given to verify the validity of the proposed strategies and methodology
author_names: Runxin Wang

Jinjun Liu

Pu Zhang

Junfeng Hou
title: Study and engineering practice of modeling IC controllers for switch mode power supplies in SIMPLIS environment
venue: Twenty First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06.
year: 2006

abstract: This paper proposes a modeling method for switched mode power supplies (SMPSs) mainly focusing on IC model for conductive noise simulation. In modern automobiles, the number of electronic control unit (ECU) are increasing in order to implement advanced features and introducing an all electric or hybrid drive system draws a high current. Since this requires higher efficiency power systems, SMPSs are widely used. Although systems using SMPSs produce switching noise as a side effect, they have to be designed to work as expected and to satisfy EMC regulation, too. To achieve this goal, it is imperative to predict and control the amount of noise at an early stage in the design by using accurate simulation models to reproduce the system behavior. Doing so greatly contributes to reducing design cost. However, it is very difficult to build SMPS IC models for noise simulation. In this paper, induced conductive EMI noise was evaluated through Electro Magnetic (EM) and SPICE co simulation following CISPR25 regulations. The SMPS, PCB, load device, line impedance stabilization network (LISN) and cables were all modeled to reproduce the regulation test environment. This model was validated by measurement on the same conditions as simulation.
author_names: Asuma Imamura

Mitsuharu Umekawa
title: Importance of switched mode power supply IC model for conductive EMI noise simulation
venue: 2016 International Conference on Electronics Packaging (ICEP)
year: 2016

abstract: The Chandra X ray observatory has discovered several dozen anomalously X ray bright jets associated with powerful quasars. A popular explanation for the X ray flux from the knots in these jets is that relativistic synchrotron emitting electrons inverse Compton scatter Cosmic Microwave Background (CMB) photons to X ray energies (the IC/CMB model) This model predicts a high gamma ray flux which should be detectable by the Fermi Large Area Telescope (LAT) for many sources. GeV band upper limits from Fermi/LAT for the well known anomalous X ray jet in PKS 0637 752 were previously shown in Meyer et al. (2015) to violate the predictions of the IC/CMB model. Previously, measurements of the jet synchrotron spectrum, important for accurately predicting the gamma ray flux level, were lacking between radio and infrared wavelengths. Here we present new Atacama Large Millimeter/submillimeter Array (ALMA) observations of the large scale jet at 100, 233, and 319 GHz which further constrain the synchrotron spectrum, supporting the previously published empirical model. We also present updated limits from the Fermi/LAT using the new `Pass 8' calibration and approximately 30% more time on source. With these deeper limits we rule out the IC/CMB model at the 8.7 sigma level. Finally, we demonstrate that complete knowledge of the synchrotron SED is critical in evaluating the IC/CMB model.
author_names: Eileen T Meyer

Peter Breiding

Markos Georganopoulos

I Oteo

Martin A Zwaan

Robert A Laing

Leith E H Godfrey

R J Ivison
title: New ALMA and Fermi/LAT Observations of the large scale jet of PKS 0637 752 Strengthen the Case Against the IC/CMB Model
year: 2017

abstract: We apply the capillary wave method, based on measurements of fluctuations in a ribbon like interfacial geometry, to determine the solid liquid interfacial free energy for both polytypes of ice I and the recently proposed ice 0 within a mono atomic model of water. We discuss various choices for the molecular order parameter, which distinguishes solid from liquid, and demonstrate the influence of this choice on the interfacial stiffness. We quantify the influence of discretisation error when sampling the interfacial profile and the limits on accuracy imposed by the assumption of quasi one dimensional geometry. The interfacial free energies of the two ice I polytypes are indistinguishable to within achievable statistical error and the small ambiguity which arises from the choice of order parameter. In the case of ice 0, we find that the large surface unit cell for low index interfaces constrains the width of the interfacial ribbon such that the accuracy of results is reduced. Nevertheless, we establish that the interfacial free energy of ice 0 at its melting temperature is similar to that of ice I under the same conditions. The rationality of a core shell model for the nucleation of ice I within ice 0 is questioned within the context of our results.
author_names: Michael Ambler

Bart Vorselaars

Michael P Allen

David Quigley
title: Solid liquid interfacial free energy of ice Ih, ice Ic, and ice 0 within a mono atomic model of water via the capillary wave method.
venue: The Journal of chemical physics
year: 2017

abstract: We describe high spectral resolution, high dynamic range integral field spectroscopy of IC418 covering the spectral range 3300 8950{\AA} and compare with earlier data. We determine line fluxes, derive chemical abundances, provide a spectrum of the central star, and determine the shape of the nebular continuum. Using photoionisation models, we derive the reddening function from the nebular continuum and recombination lines. The nebula has a very high inner ionisation parameter. Consequently, radiation pressure dominates the gas pressure and dust absorbs a large fraction of ionising photons. Radiation pressure induces increasing density with radius. From a photoionisation analysis we derive central star parameters; \log T_{\mathrm eff} 4.525$K, \log L_*/L_{\odot} 4.029$ \log g 3.5$ and using stellar evolutionary models we estimate an initial mass of $2.5 M/M_{\odot} 3.0$ The inner filamentary shell is shocked by the rapidly increasing stellar wind ram pressure, and we model this as an externally photoionised shock. In addition, a shock is driven into the pre existing Asymptotic Giant Branch stellar wind by the strong D Type ionisation front developed at the outer boundary of the nebula. From the dynamics of the inner mass loss bubble, and from stellar evolutionary models we infer that the nebula became ionised in the last $100 200$,yr, but evolved structurally during the \sim 2000$ yr since the central star evolved off the AGB. The estimated current mass loss rate \dot M 3.8\times 10^ 8} M_{\odot}$yr$ 1} and terminal velocity $v_{\infty} \sim 450$ km/s) is sufficient to excite the inner mass loss bubble. While on the AGB, the central star lost mass at \dot M 2.1\times 10^ 5} M_{\odot}$yr$ 1} with outflow velocity \sim 14$ km/s.
author_names: Michael A Dopita

A Farag Ali

R S Sutherland

David C Nicholls

M A Rafih Amer
title: IFU spectroscopy of southern planetary nebulae IV: a physical model for IC 418
year: 2017

abstract: Most type Ic core collapse supernovae (CCSNe) produce {56}$Ni and neutron stars (NSs) or black holes (BHs) The dipole radiation of nascent NSs has usually been neglected in explaining supernovae (SNe) with peak absolute magnitude $M_{\rm peak} in any band are \gtrsim 19.5$~mag, while the {56}$Ni can be neglected in fitting most type Ic superluminous supernovae (SLSNe Ic) whose $M_{\rm peak} in any band are \lesssim 21$~mag, since the luminosity from a magnetar (highly magnetized NS) can outshine that from a moderate amount of {56}$Ni. For luminous SNe Ic with 21 \lesssim M_{\rm peak}\lesssim 19.5$~mag, however, both contributions from {56}$Ni and NSs cannot be neglected without serious modeling, since they are not SLSNe and the {56}$Ni mass could be up to \sim 0.5 M_{\odot} In this paper we propose a unified model that contain contributions from both {56}$Ni and a nascent NS. We select three luminous SNe Ic BL, SN~2010ay, SN~2006nx, and SN~14475, and show that, if these SNe are powered by {56}$Ni, the ratio of $M_{\rm Ni} to $M_{\rm ej} are unrealistic. Alternatively, we invoke the magnetar model and the hybrid {56}$Ni NS) model and find that they can fit the observations, indicating that our models are valid and necessary for luminous SNe Ic. Owing to the lack of late time photometric data, we cannot break the parameter degeneracy and thus distinguish among the model parameters, but we can expect that future multi epoch observations of luminous SNe can provide stringent constraints on {56}$Ni yields and the parameters of putative magnetars.
author_names: Su Q Wang

Ling Jun Wang

Z G Dai

X F Wu
title: A Unified Energy Reservoir Model Containing Contributions from {56}$Ni and Neutron Stars and Its Implication to Luminous Type Ic Supernovae
year: 2015

abstract: Many studies have addressed the issues of the evaluation and the selection of new technology. In this paper, we add to this literature by formulating a more general model that incorporates the evaluation, the selection and the improvement of new technology. The improvement of new technology refers to the modification of the development of the underlying technology. We accomplish this by combining an Importance Score Report for each of the factors of the new technology to the adopting firm and a Performance Score Report of the alternative new technologies' performance on each of the factors into a two dimensional graph. This graph helps to reveal the specific factors of the new technology for the adopting firm to work on improving. Processes such as this will be an informative and powerful planning tool for decision maker when choosing among competing new technologies. We then use a case of selecting a 3D IC TSV technology for a Taiwanese IC manufacturer to illustrate the application of the PTSM. Three critical factors of the 3D IC TSV technology were then identified for improvement.
author_names: Chih-Young Hung

Wen-Yi Lee
title: A proactive technology selection model for new technology: The case of 3D IC TSV
year: 2016

abstract: This paper presents a behavioral model for amorphous indium gallium zinc oxide thin film transistor using artificial neural network (ANN) based equivalent circuit (EC) approach to predict static and dynamic behavior of the device. In addition, TFT parasitic capacitances (CGS and CGD) characterization through measurements is also reported. In the proposed model, an EC is derived from the device structure, in terms of electrical lumped elements. Each electrical element in the EC is modeled with an ANN. Then these ANNs are connected together as per the EC and implemented in Verilog A. The proposed model performance is validated by comparing the circuit simulation results with the measured response of a simple common source amplifier, which has shown 12.2 dB gain, 50 mW power consumption and 85 kHz 3 dB frequency with a power supply of 6 V. The same circuit is tested as an inverter and its response is also presented up to 50 kHz, from both simulations and measurements. These results show that the model is capable of capturing both small and large signal behavior of the device to good accuracy, even including the harmonic distortion of the signal (that emphasizes the nonlinear behavior of the parasitic capacitance) making the model suitable for IC design.
author_names: Pydi Bahubalindrun

Vitor M Grade Tavares

Pedro Barquinha

Pedro Guedes de Oliveira

Rodrigo Martins

Elvira Fortunato
title: InGaZnO TFT behavioral model for IC design
year: 2016

abstract: Abstract 3D integrated circuits (3 D ICs) technology is a promising approach for next generation semiconductor microelectronics. A 3D IC is formed by vertical interconnection of multiple substrates containing active devices which offer reduced die footprint and interconnect length. Thermal management of a multi die stack is a significant research challenge, for which rapid temperature computation in a 3D IC is desirable. This manuscript presents a non iterative heat transfer model for predicting the three dimensional temperature field in a multi die 3D IC. The non iterative model is much faster and accurate in comparison to finite element simulation and recently presented iterative models for temperature computation. The analytical model is used to compute the temperature field of a 3D IC with a large number of die. The model is also used to examine the effect of various parameters on the computed temperature field. In particular, the effect of thermal contact resistance is presented. The model and results presented in this manuscript are expected be useful in rapid computation and effective thermal design of 3D ICs.
author_names: Leila Choobineh

Ankur Jain
title: An explicit analytical model for rapid computation of temperature field in a three dimensional integrated circuit (3D IC)
year: 2015

abstract: The interstellar medium of the radio galaxy IC 5063 is highly perturbed by an AGN jet expanding in the gaseous disc of the galaxy. We model this interaction with relativistic hydrodynamic simulations and multiphase initial conditions for the interstellar medium and compare the results with recent observations. As the jets flood through the intercloud channels of the disc, they ablate, accelerate, and disperse clouds to velocities exceeding 400 km s( 1) Clouds are also destroyed or displaced in bulk from the central regions of the galaxy. Our models with jet powers of 10(44) and 10(45) erg s( 1) are capable of reproducing many of the observed features in the position velocity diagram of IC 5063, and confirm the notion that the jet is responsible for the strongly perturbed gas dynamics seen in the ionized, neutral, and molecular gas phases. In our simulations, we also see strong venting of the jet plasma perpendicular to the disc, which entrains clumps and diffuse filaments into the halo of the galaxy. Our simulations are the first 3D hydrodynamic simulations of the jet and interstellar matter of IC 5063.
author_names: Dipanjan Mukherjee

Alexander Y Wagner

Geoffrey V Bicknell

Raffaella Morganti

Tom Oosterloo

Nicole P H Nesvadba

R S Sutherland
title: The jet ISM interactions in IC 5063
year: 2018