Questions tagged [modeling]

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

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49 views

How to accurately model a load when designing a circuit?

Imagine you have to design an intermediate stage of an existing circuit because it requires a new functionality. How do you model the rest of the circuit that yours will feed into? For instance, if ...
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1answer
27 views

Delay implementation in PSpice

1.I have been using oscillator circuit as Parametric delay block with the help of other sub blocks at the output/around. Second method is RC for the delay at the output of any circuit (ABM) or ...
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2answers
82 views

Voltage spreading to resistors network

I want to model several electrodes (say 3) and GND on a resistive substrate. simulate this circuit – Schematic created using CircuitLab To characterise it, I apply a current on one electrode ...
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2answers
51 views

Brushless DC motor steady-state performance modeling

For a brushed DC motor, there are the well-known differential equations describing the electrical and mechanical behaviour: \$V_a-i_aR_a-L_a\frac{d}{dt}i_a-k_e\omega_a=0\$ \$k_ti_a-J\frac{d}{dt}\...
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1answer
41 views

Mathematical Model for SiC MOSFET C2M0080120D, transconductance and capacities [closed]

I am currently trying to use the model described in the paper "An Improved Analytical Model for Predicting the Switching Performance of SiC MOSFETs" in MathLab to simulate/imitate it. The paper can be ...
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1answer
93 views

Test cases for for OTA in LTSpice

Here is a component OTA provided by LTSpice which has inverting non inverting common and output node. I am in process of modelling this OTA behavior form LTSpice to PSpice. I reffered this link for ...
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37 views

Low-Speed CANbus Common-Mode Choke Insertion Loss

I'm designing a low-speed CAN transceiver breakout-board (schematic below) and I'm trying to select the proper choke to use to reduce common-mode noise. I've found a few common-mode chokes meant ...
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1answer
77 views

Appropriate model of an unknown sonar piezo

I have a collection of piezoelectric transducers that I have got from old devices. No print stamp on them, and I couldn't get a schematic of the device that could help me to find a datasheet. I ...
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28 views

LTspice DB207 Bridge Rectifier Model

I have breadboarded a 6/12VAC to variable DC power supply that I want to analyze before hard wiring. It uses the DB207 bridge rectifier chip and I cannot find a LTspice model for it. Does anyone have ...
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1answer
35 views

How to model a Electronic Proportional Control Valve

I am using a VSO LowPro Proportional control Valve (https://www.parker.com/Literature/Precision%20Fluidics/Miniature%20Proportional%20Valves/VSO%20LowPro.pdf) to regulate pressure into a closed ...
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45 views

Abstract signal and noise model for a logarithmic image sensor

A conventional grayscale image sensor pixel can be modeled as a "light bucket." Photons arrive on the sensor pixel for a fixed exposure time. The light bucket fills up with photo-electrons linearly ...
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Modeling the thermal part of the Time-current curve

G’ day, I am working on designing protection devices for my research work and I am struggling to model the thermal part for the low voltage circuit breakers based on IEC standards. Based on the ...
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1answer
376 views

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 ...
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27 views

FEMM: Calculating Torque of an Induction Motor using the Air Gap Integral and SlidingBand

I am currently working on my Master's Thesis, building an Octave/MATLAB-Program to automatically calculate desired outputs of various induction motors. Since FEMM released the (Anti)-Periodic-Air-Gap-...
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0answers
23 views

Price as a function of load on an electric grid(City modeling)

Thanks for your time. First some context and the actual question is marked further down. Context: I am modeling a city as a complex adaptive system and am building a model of an electric grid to run ...
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3answers
126 views

Model railway Arduino control

I'm helping my dad build a model railway and unfortunately he doesn't have the space to build a full oval for his trains to run around, so we've built a u-shaped track for them to run end to end. I ...
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98 views

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. ...
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30 views

permanent magnet synchronous motor Lagrangian in qd0 frame

I'm trying to derive a symplectic model for a permanent magnet synchronous motor (PMSM) in the rotating qd0 reference frame using a geometric integrator. For that purpose, I need the discrete-time ...
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1answer
45 views

DC motor model issue

I use the following DC drive model: with the following parameters of the motor: Matlab variables for these parameters: ...
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65 views

Ferroelectric Capacitor model using verilog-a

I am trying to develop a behavioral model of a ferroelectric capacitor using verilog-a. The ferroelectric material is HfO2 in between the capacitor plates. I know the polarization hysteresis formula ...
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0answers
52 views

PMSM dynamic model

I have been working on a dynamic model of the PMSM with surface mounted magnets and sinusoidal stator winding. I am little bit confused by formulas for the \$L_d\$ and \$L_q\$ inductances. I have ...
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0answers
82 views

Stumped about how this switching circuits system works

I have stumbled upon this circuit from an online electronics course (https://pirateselectronics.teachable.com, chapter "Dual Flash Lights"): The behavior of this system is that both LEDs switch on ...
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1answer
63 views

What are the equations/values for Rayleigh Fading, path loss and log-normal shadowing?

I am to use the following equation as part of a model for a wireless communications network: I would like to know the specific parts of the eqautions: "k" - is this the Boltzmann constant? "v" - I ...
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1answer
32 views

DQ Currents in the Induction Motor Model

While studying the Induction Motor modelling and also its Vector control using DQ currents decoupling method.. I am finding it hard to see which current is which on the model diagrams. Can anyone ...
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1answer
74 views

Izhikevich Neuron model - Equations [closed]

Disclaimer: I've asked this same question before, but on StackOverflow, where I got (not so kindly) reminded that StackOverflow is not the right place for this question. I'm pretty confident that this ...
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2answers
250 views

BJT AC Analysis using r_e model

This is a picture of a Common Emitter Voltage Divider bias and it is been modelled using a CCCS and a diode resistance using the r_e model. Now my doubt is that I get problem in finding the input ...
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79 views

Transfer function_Approximation of second order system for a linear actuator

I am trying to approximate a transfer function of a system. The system is a linear actuator, connected to a feedback potentiometer. The actuator has a mass on it. The following figure is a step ...
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1answer
74 views

Using PSPICE model of gate-driver from manufacturer

I have found a PSPICE model for a part I'm interested in. ISL55110 Datasheet: https://www.mouser.com/datasheet/2/698/isl55110-11-1302115.pdf Manufacturer PSPICE Model: https://www.renesas.com/cn/zh/...
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2answers
130 views

How to get stall current from DC motor model

I'm studying the model of a dc motor from this link : http://ctms.engin.umich.edu/CTMS/index.php?example=MotorSpeed&section=SystemModeling The equations are: \$\ s(Js+b)\theta(s)=K I(s)\$ \$\ (...
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1answer
54 views

modeling of a dc motor with load

I designed a robot. It consists of an actuator, linkage and a camera. the actuator is considered as a dc motor in this problem. I need to identify this system. how can I find a model for actuator and ...
2
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1answer
39 views

Failure Rate calculation based on manufacturing defects (capacitor)

Electronics failure rates typically follow the exponential distribution and models like Prism, Mil-Hdbk-217 or 217Plus (newer) are used to predict failure rates. We are currently in the production ...
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2answers
93 views

Modeling a long single wire in a circuit?

I'm currently trying to make a model (equivalent circuit) of a long single wire with a resistor and inductor in series. Is this a proper way to do it? What I have done: Calculating the resistance ...
2
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1answer
251 views

Differential Equation of a LC Low Pass Filter

I'm trying to learn about different applications of RLC circuits and have been presented with a weird looking circuit... I've only ever dealt with circuits that can be modeled with a 2nd-order ...
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1answer
135 views

BLDC Transfer Function Inductance Value

I realize a very similar question has been asked here, but I'm slightly confused about the derivation, specifically the quantities Lq and Rq which refer to the armature inductance and resistance. I'm ...
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1answer
153 views

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 ...
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2answers
213 views

Issue using pspice .lib in ltspice - Unknown Parameter

I received an unencrypted PSpice model of a TI Boost Converter (TPS43061) and I am trying to use it in LTSpice but I'm getting the following error and I'm not sure what I can do about it. Unknown ...
2
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1answer
133 views

How can I model a double pendulum in op-amps? [closed]

I'm interested in chaotic circuits; and while many circuits that model attractors like Chua's Circuit, Lorenz Attractor, and RC phase shift networks are available, I would really like to model the ...
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1answer
53 views

Is this negative resistor model valid for any type of LC self oscillating circuit?

Is the following negative resistance model valid for any type of LC oscillator? If not, what are the exceptions? Image Source is from here
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1answer
96 views

Is the Gummel-Poon model useful for explaining AC transistor amplification?

Let me be clear: By amplification I am talking about the process of boosting the strength of an AC signal. Thus, where the output power to input power ratio is greater than 1. Now suppose we have a ...
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2answers
559 views

Equivalent circuit of a photodiode

What can I learn from an equivalent circuit model of photodiode like the following? I've actually gone the whole way beginning from doping semiconductors through each noise term to the amplification ...
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1answer
38 views

Accelerometer first-order Markov chain model

I am trying to implement the algorithm for altitude estimation presented here. In the beginning of section 2.1 the authors present the mathematical model they will be using for the accelerometer. The ...
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1answer
131 views

How to double the collector current of a BJT in LTSpice?

I am trying to model a multi-collector lateral PNP in LTSpice. The link here suggests to put 2 PNP transistors in parallel and split up the IS into two parts. http://pallen.ece.gatech.edu/Academic/...
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1answer
40 views

Making a model of a transformer

According to this link, the equivelent circuit diagram of a transformer (seen from the secondary side) looks like: Now, I want to find the values of the following constants: $$R_p,X_p,R_c,X_m,R_s,...
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119 views

How to solve a specific circuit with dependent sources

I am trying to solve this circuit: V1 is the positive side of Vonc and V2 is the positive side of Vint My advisor has us modeling this circuit with respects to some biomedical applications. The ...
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1answer
5k views

What is a typical diode's ideality factor?

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

Modelling catastrophic component failure

For most of the time in circuit simulation, the component models used are ideal and don't feature fail-states e.g. this answer here. Have there been any projects that have attempted to model what a ...
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3answers
382 views

Is the hybrid-pi parameter hie really equivalent to (beta+1)*re?

I'm reading a book on feedback amplifiers at the moment and it makes comprehensive use of a simplified hybrid-pi model. A parameter that keeps popping up is hie and I've always considered this to be ...
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0answers
74 views

What is a good Field-Effect Transistor Model?

Hi guys I'm writing an electronics circuit simulator and I need a very simple and straightforward model for a field-effect transistor (as simple as the Ebers-Moll model for a BJT). I can use resistors,...
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1answer
150 views

Basic MOSFET modelling question

I have a basic question regarding silicon-based MOSFETs and alternative MOSFETs such as InGaAs. I am aware of the fundamental equations in which describe the current flow for the silicon channel ...
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3answers
598 views

How is possible that with same Ibase there is more than one Vce?

Ok guys, look at this picture: How is possible that with the same \$I_{\rm base}\$ we have more than one \$V_{\rm ce}\$?