Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [modeling]

This tag covers finding models for electrical and electronic components and circuits

275 questions
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votes
4 answers

How do I construct a SPICE model from a data-sheet?

This may not be the ideal forum for the question; please migrate if a forum is better suited for the question. I'm looking at a component for which my attempts at locating a SPICE model online were fruitless. There are, however, datasheets of the…
Everyone
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1 answer

Mathematical models for vacuum tubes?

Are there any commonly accepted algebraic models for vacuum tube operation (triode, tetrode, and pentode)? In the same way that BJTs have a Gummel-Poon or Ebers-Moll model, and (macroscale) MOSFETs have a cutoff/linear/saturation algebraic model,…
compumike
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2 answers

How, if at all, can a memristor be emulated with active components?

I find existing explanations of memristors are either overly vague, or an unapproachable mass of academic, mathematical analysis. I want to gain an intuitive understanding of what a memristor is, what it does, and what its applications might be in…
Phil Frost
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3 answers

What causes this knee in my MOSFET drain voltage drop?

FINAL UPDATE: Understand a previously mysterious power MOSFET switching waveform wiggle! @Mario uncovered the root cause here below, distinctive to so-called VDMOS devices, typical of many power MOSFETs like the IRF2805. UPDATE: Found a clue!…
scanny
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8
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1 answer

Why are these commercial MESFET model parameters unrecognized by LTspice?

I am trying to add a commercial GaAs FET model (ATF34143) in LTSpice XVII for simulation. The model is provided on this website (http://www.hp.woodshot.com/hprfhelp/design/SPICE/fets.htm#ATF34). Unfortunately the model is not working and I'm…
Matteo Aluffi
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8
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2 answers

What is a typical diode's ideality factor?

Some background, for anyone unfamiliar: The Shockley diode equation is $$ I_D = I_S·\left(e^{\frac{V_D}{n·V_T}}-1\right) $$ with the quantity \$n\$ called the ideality factor, a number between 1 and 2. Ideal diodes have an ideality factor of 1,…
Hearth
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1 answer

Modeling a solar panel for simulations

I need to simulate a power conversion system (using SIMetrix/SIMPLIS) in which solar energy is captured by a solar panel, which is then connected to an inverter for supplying current to the grid. Since I need to simulate this, I am struggling in…
DavideM
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8
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1 answer

Simulation model for floating gate

I am designing a non-volatile memory cell and foundry does not have model for floating gate . So I used the Voltage controlled current source to mimic floating gate. For output characteristics, I already had the measurement of previous fabricated…
frasheed
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8
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6 answers

Does anyone use op-amps for modelling physical systems any more?

I am studying for my System Modelling and Simulation exam. So the textbook says there are three categories of models. Graphical - block diagrams and signal flow graphs. Physical - physical similarity models and physical analogy models. Symbolic -…
Vorac
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7
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1 answer

Modeling scalar control of PMSM

I have met with a scalar control algorithm for a permanent magnet synchronous motor. I haven´t heard about it before so I decided to develop a dynamic model to further analyze this control algorithm. Unfortunatelly I haven´t got the Matlab with the…
Steve
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6
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1 answer

What is exactly modeled by 'transit time' in SPICE diode model?

I'm trying to find a precise definition for the transit time parameter in SPICE diode model. What I think is the official documentation for standrad Berkeley SPICE diode model says the following Diode Model (D) The dc characteristics of the diode…
MPA95
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5
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1 answer

How to transform the state space model of the induction motor?

First of all I would like to apologize if I have chosen wrong forum. My question is related to the electrical engineering but basically it is a mathematical problem. I have the state space model of the three phase squirrel cage induction motor. The…
Steve
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5
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2 answers

How do I import a spice model into LT spice?

I decided to create a question of how to import models into LT spice since there were questions that are related but no definitive guide on how to import 3rd party models on this site. There are many ways to do this, post your favorite method How do…
Voltage Spike
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Operation of BJT with low values of Vbe ("cutoff" region)

Many sources claim that when the base-emitter voltage becomes smaller than approximately 0.6V-0.7V, the bipolar junction transistor goes in the cutoff region and there is zero base and collector current. Of course this is not completely true, since…
Tob Ernack
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5
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1 answer

Modelling MEMS accelerometer's measurement noise using datasheet (ADXL330)

I'd like to model an Analog Devices ADXL330 MEMS accelerometer using data provided in its datasheet to estimate measurement noise. I'm using a simple mathematical model defined in the paper "Non-linear complementary filters on the special orthogonal…
mmm
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