Questions tagged [modeling]

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

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66 views

Mathematical function a of an integrator in series with a non inverting op amp

I am trying to understand the circuit given below so I can make a mathematical model of it. The circuit consists of an integrator with a reference (offset) voltage and a non inverting op amp ...
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31 views

Cannot obtain a generalized state space averaged model for simple wireless power transfer system

this is the first time I ask a question. I am currently working on finding a state space model of the following system : where \$U_i\$ is a square wave of amplitude \$U_{in}\$. This circuit ...
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20 views

Modelling Biased APD In Integrator Circuit

I want to model a biased APD (Avalanche Photodiode) whose current output feeds into an integrator. For the IC I will be using, TI recommends the following configuration for an unbiased photodiode. ...
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1answer
49 views

Photodiode Modelling

I want to model an Avalanche Photodiode (APD) in LTSpice. Is the below an appropriate representation?: simulate this circuit – Schematic created using CircuitLab If so, why is the diode ...
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18 views

System level behavioral model for PSSR of a switching regulator

In a design I have a switching regulator (buck for the sake of my example). The switching frequency is much higher than the frequency range of interest and can be safely ignored. However, the input ...
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39 views

Proteus I2C slave and SPI slave primitive

There is a modeling primitives category in Proteus VSM, which contains I2C slave and SPI slave primitives from the DSIMMDLS library. Device notes for each say the following: "This primitive can ...
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49 views

Typical parasitics values of thick film SMD resistor

I'm looking for values of parasitics for SMD thick thilm resistors (the cheap and readily available). Values of the following model Closest I found is this application note from Vishay, but it is for ...
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1answer
93 views

How lossy is a ferrite bead in its "capacitive" regime?

When using ferrite beads in spice, I often have the impression that they are not lossy enough compared to the real thing. In particular, the conventional model of RLC all in parallel is basically a ...
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1answer
74 views

What is the difference between large signal model/analysis and dc model/analysis? [closed]

I am studying microelectronics. I have studied about the DC analysis and the AC analysis. The DC analysis is just to find the operating point or the quiescent point and then the AC analysis is done. ...
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54 views

Circuitlab - How can I create my own transistor model?

I would like to create some transistors, like the S8050 transistor, for to use in CircuitLab. What I found is https://www.circuitlab.com/docs/custom-device-models/ If I open another existing ...
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2answers
109 views

How does current flow in this circuit with multiple power regulators?

I have the following circuit: simulate this circuit – Schematic created using CircuitLab U1 contains two voltage regulators (Vo1=+10V, Vo2=-10V, input Vin=5V). (These could be buck, boost etc. ...
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56 views

Diode Stack SPICE Modeling

When I model a 7 diode stack in SPICE (LTSPICE or core Smartspice within Silvaco TCAD) the standard level 1 'Berkeley' model works, but the Philips model fails. The Philips diode model (see Smartspice ...
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2answers
112 views

Can I increase the inductive component stored-energy of a Piezo Buzzer?

In this example of a model for a piezo element, there is an inductive component (I think this is a quartz crystal model -- it should not matter for the question. This graphic was also used here and ...
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1answer
52 views

Correct block diagram of differential equation

I am studying modeling and simulation. I have to draw a block diagram (so that it gets simulated in Simulink) of the following differential equation $$ \frac{d^2 y}{dt^2}=-a_1\frac{d y}{dt}-a_2y+a_2u$$...
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1answer
65 views

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 ...
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80 views

How to design voltage controller for non-linear circuit?

Let's say I would like to design the PI controller for the \$v_C\$ voltage in the below given circuit. I have attempted to design the PI controller in following steps. Development of the ...
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2answers
186 views

Different levels of SPICE models

I wanted to model some components operated in a switching boost power converter at LTspice and i realized that different levels are available for power mosfets. Do all components have different levels ...
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30 views

Three Phase Inverter Simulator Code

I am trying to build a controller for inverter. For this, I need build an inverter simulator, which simulates the model of the said inverter to produce a three phase output. I am trying to approach ...
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70 views

Dynamic model of the three phase inverter with LCL filter

I have been working on a dynamic model of the three phase grid forming inverter i.e. following power electronics circuit It is basically a three phase voltage source inverter with the LCL filter at ...
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4answers
118 views

Loss-free resistor model

Can someone use a simple explanation to tell me what a loss-free resistor model is? I googled it but it is hard to understand. When I study power factor correction circuits, I see some papers use this ...
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18 views

"Wild" surge of solar panel current in the mppt-controller model

I ask the help of electrical engineers. I am developing a model of an MPPT-controller, the model has not yet been completed (only DC-DC, the load and the panel itself are connected). I do it in ...
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1answer
84 views

Differential Square Current generator LTspice

I am trying to model a square wave differential current generator in LTSpice for MAX30001 IC, refer page 6 for the specs. Specifications: Differential Square wave, Amplitude : 8 to 96 uApk and ...
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515 views

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 ...
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1answer
260 views

How to determine the ideality factor (N) of a diode from the datasheet?

I have to find Is an N from the datasheet of diodes 1N4004 and 1N4148. I did this by estimating both of these by accomodating a straight line in the log-linear Id vs Vd graph in the datasheet of each ...
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1answer
55 views

How to model the three phase pwm rectifier?

I have been working on a dynamic model of the three phase pwm rectifier also known as active front end (AFE). The circuit diagram is following I have decided to solve that task this way: choose some ...
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0answers
85 views

Is a resistor capacitor model of a battery a good approximation?

Batteries are known to have an amount of internal resistance that reduces their terminal voltage with current draw. However another property of batteries appears to be the gradual recovery of the ...
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96 views

Importing PSpice Model (.lib) into Proteus

I know there is a popular tutorial on how to import PSpice models into Proteus here. The problem is, the PSpice model I have downloaded for FQT5P10 is in the form of .lib I think that is the reason ...
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249 views

Using wrapTo2pi in simulink

Is there a way to use wrapTo2pi in simulink without getting error 'Function 'wrapTo2Pi' not supported for code generation.' Thanks.
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0answers
54 views

What is the (typical) value of SPICE parameter ISS for a (vertical) npn transistor?

SPICE gives a default value for the (collector) substrate leakage saturation current ISS. The default is ISS=0 but I would like to know the real value for an integrated vertical npn transistor. The ...
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51 views

Crystal model parameters in spice

I have these nice piezo transducers to characterize (of course the datasheet is incomplete) and make a spice model for oscillator design purposes. Now, Rhea and the other people say "hook it up ...
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38 views

How to add transistor model to LTspice? [duplicate]

So, I'm an absolute beginner at LTSpice(I just started today). I want to know how to add the model of transistor(say model ZTX300 or BC108) to my schematic. I can't find the model in the standard.bjt ...
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752 views

SPICE modeling gas discharge tube using state machine and behavioral resistor

A gas discharge tube (GDT) is a state machine which transitions from a high impedance ("normal") state to a low impedance ("glow") state when the potential across its terminals ...
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2answers
90 views

Help understanding BJT active load SPICE model parameters

Why would Q3 and Q4 not have the same BF values in the picture of the Spice model i have attached?
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96 views

number of independent energy-storage elements in this circuit?

So I practiced various examples of modeling electrical cricuits and mehanical circuits. I stumbled upon this one: and it's same as this: now with these direct substitutions: $$k=\frac{1}{L},\;B=\...
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1answer
601 views

Simulating an Electric Car Battery in LTSpice

I am sorry if this is a general question: Does anyone know who to simulate an Electric Vehicle Battery (EVB) in LTSpice (or other free downloadable software)? Are there models I can download online? ...
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61 views

IGBT modelling from datasheet

how to model igbt from the APT150GN120J datasheet. ...
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1answer
26 views

How to fix ngspice simulation of Cree XLAMP CXB1507

I'm trying to simulate the 36V Cree XLAMP CXB1507 (spice model) using kicad+ngspice. When I try simulate it gives the following error: .model cxb1507 36v d is=6.15257e-19 n=32.22321 rs=9.82504 xti=...
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1answer
2k views

Lithium Ion Battery Model in LTSpice

I am looking for a model I can use in LTspice for a a Lithium Ion battery. It is a pulsed load and I want to see things like heat losses and discharge time. Is there an existing model I can utilize ...
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1answer
151 views

Loopstick (ferrite rod) antenna circuit model

A ferrite rod antenna circuit equivalent is usually given as so: The numbers are made up, I didn't calculate the exact C you need to have to make it resonate at 1 MHz. Here's a slightly more ...
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1answer
75 views

Modeling IF transformers in PSpice

How can I create an "IF AMPLIFIER TRANSFORMERS" in PSpice? Which one should I choose? "Forward" or "Two Winding"? And if there is no problem, just according to this site ...
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1answer
31 views

Modelling an STM Tip current

As part of a current-to-voltage preamplifier that I'm working on improving, I'm trying to model the current source of an scanning tunneling microscope (STM). The way it works is described below (based ...
1
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2answers
88 views

How can I adequately recreate a signal with a biphase line code after band-pass filter in python?

I want to create a python model of a transmitter. The transmitter uses a biphase line code, which looks like this (from a datasheet): Additionally, the datasheet states that the signal is "...
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1answer
112 views

Can I use the Coulomb Counting Method to estimate the SOC of a battery being charged by PV panels?

I have seen a couple questions about Coulomb Counting, but I have not found anything defining an "outside source" providing the current to the battery, this questions might be close, How to ...
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35 views

Modeling the discharge efficency of grid connected energy storage systems

Short form A battery has a charge and discharge efficiency of \$95\$%. The initial SoC is \$3 \text{ MWh}\$. It charges for an hour with \$1 \text{ MW}\$, then discharges for an hour with \$1 \text{ ...
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1answer
47 views

Wireless tagging for beginners

I will preface this question with a caveat: I'm a reasonably talented programmer, but an absolute novice in electronics. This will be my first project. My dad has a 1/19th scale model railway. I'd ...
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3answers
237 views

LTspice: reverse biased diode fails in ac analysis

I want to read out the diode saturation current with ac analysis. In this example, 100uA. Hence I bias the diode at -1V where the diode current is effectively the saturation current (*-1). It works ...
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2answers
121 views

How to write subcircuits netlists in Spice with multiplicity factors?

I am trying to port a behavioral device model from Cadence Spectre to Spice. In Spectre it is very easy to instantiate multiple parallel instances of a subcircuit automatically - one just calls the ...
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0answers
64 views

What is the "DanTherm" model in the SOATherm library in LTSpice?

LTSpice's SOATherm symbol has a "user-defined" option in the models list but I can't find any documentation on how to use it. Out of curiosity I opened the .lib file and there is a user-...
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2answers
674 views

diode equivalent circuit model AC analysis

I've understood the small-signal analysis for the diode, like how is the value for rd derived. But here are somethings i don't understand: How is capacitance of the diode dependent on the frequency ...
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2answers
308 views

Does the Shockley diode equation apply to Schottky diodes and non-silicon diodes?

As I'm sure most people here know, the Shockley diode equation is $$ I_d=I_s[e^{\frac{V_d}{nV_t}}-1] $$ Notice that none of the quantities here other than \$I_s\$ and \$n\$ are dependent on the diode ...

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