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Questions tagged [modeling]

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

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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
28 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
19 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
44 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
71 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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34 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
23 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
42 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
45 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 ...
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1answer
29 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
80 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 ...
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1answer
119 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
58 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
111 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
79 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 ...
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0answers
60 views

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

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
44 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
65 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
247 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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0answers
81 views

FEMM : Permanent magnet motor design

I want to design a permanent motor in FEMM. As you can see the topology of the permanent magnet is quite complicated so I would like to ask if there is a generic algorithm/way to design a motor like ...
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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
83 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
37 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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78 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
2k 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
160 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
218 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
57 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
143 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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0answers
23 views

Model BLDC Motor Disturbances

I'm doing a flywheel attached to bldc model, and I'm applying disturbances to it. I want to model torque ripple and cogging on Simulink, but I can't find a formula for it. Does anyone know where I can ...
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0answers
62 views

What are the stationary & non-stationary characteristics of a channel?

I am not sure if this is the proper stackexchange site to ask this question but I couldn't find a dedicated telecommunications ask & answer site. dsp.stackexchange.com would be an alternative too ...
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3answers
492 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}\$?
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2answers
212 views

How to model a Schottky diode based on datasheet?

I have a question about how to model a non-linear a Schottky diode based on available datasheet in ADS. Should I just assign Rs and Cj values from datasheet? http://datasheet.octopart.com/DMK2790-...
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3answers
1k views

How to Model a Transformer in LTSpice

I am modeling a low voltage single phase electrical distribution system with a step-down transformer using LTSpice (source is 480Vrms step down to 120Vrms). In LTSpice instead of setting the turns ...
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36 views

How to model and synthesise circuits taking into account timing issues: the case of an edge detector circuit

One of Ben Eater's videos about building an 8-bit computer shows one way to build an edge detector using an inverter and an and gate: https://www.youtube.com/watch?v=YW-_GkUguMM (minutes 7:40-9:40). ...
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0answers
120 views

Solve \$n \times n\$ rectangular grid of resistors for mesh currents

I am modeling a mechanical process by using an electrical analogue. I need to calculate the loop (mesh) currents, then I can see if any mesh current is greater than a predetermined value \$\lambda\$. ...
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66 views

LTspice Hung Up For Certain Voltages?

I am running a transient model of a Type-E PFN circuit (probably not an important detail) and my processing time jumps from about 1 minute for one DC source voltage to roughly 475 years for another. ...
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286 views

How's this for an SSR LTspice model?

I probably need to use an SSR for a design. I have never used SSRs, I just know things that have read on data sheets and the internet. I am planning on using the following spice circuit for a model... ...
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0answers
93 views

Antenna gain, effective aperture and SNR

I'm trying to predict the SNR of different antenna. I have a good propagation model to calculate path loss/received power. My question is in the signal-to-noise ratio equation there are terms, Ae, for ...
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141 views

PSpice Bipolar Junction Transistors Modeling

i want to simulate the circuit AmpopTBH2, on PSpice. On image 1hbt.png we can see that Draft4 is working fine, on image 2hbt_pardif.png is the same circuit as Draft4 but on PSpice that circuit won't ...
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1answer
296 views

Unrecognized and ignored parameters in LTspice while adding a Third-party model

I have tried to add a third party model to my LTspice program (2016 version) but when I run the simulation many errors show up. The model is made for PMOS and NMOS ( saved at the same link) Link of ...
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1answer
385 views

Measuring Transformer Magnetizing Inductance

I am trying to fit measured transformer data to the standard mathematical transformer model. I have done the short circuit measurement to get leakage inductances and measured DC primary and secondary ...
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2answers
853 views

MOSFET input capacitance variation with Vgs

Let's consider the classic FET push pull Class-AB follower. simulate this circuit – Schematic created using CircuitLab The DC operating point is determined by output voltage and output current,...
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1answer
414 views

Mathematical Modelling of AC Servomotor

i want to model an AC Servomotor where i assume that a dynamic load is attached to the shaft of AC Servomotor. the link of the paper that i have attached in the start of this post has ac servomotor ...
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2answers
60 views

Basic electronics: input currents of multi-port sub-circuits

I am simulating, with PSpice, the transient behavior of an analog circuit that contains several multiport sub-circuits. When I probe the current on all inputs of a sub-circuit, I see that the sum of ...
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35 views

Help with modelling a piezo

I'm using the Van Dyke model from this article and I'm a bit lost on a few things. Since the only nodes I can physically connect to are the ends, can I assume that I am limited to the voltage across ...
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2answers
1k views

Default value of W/L of nmos in LTSpice IV

I am using LTSpice IV. I would like to know the default parameter values of nmos and pmos . We can pick a mosfet model in which other parameters are present(eg: IRLML2346 etc) but the valu of W/L is ...
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3answers
649 views

Transfer function of a rotary encoder

First of all, I would like to tell you that this is my first question on this forum and I found your topics and your answers very useful during my academic years so thank you all. At the moment I have ...
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2answers
952 views

Average PWM Switch Model

I'm trying and want to learn how to use the PWM Switch Model by DR.Vorpérian , both for the voltage mode(VM) and current mode (CM) model. I've read some about the models in "Switched-mode power ...
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1answer
54 views

h parameters vs. frecuency

The question I need to solve is: how do the h parameters (hybrid) vary as a function of frequency? In particular, I need to estimate the Y parameters (admitance parameters) for a 2N3904 transistor, ...