Questions tagged [modeling]

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

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Digital Potentiometer LTSpice Model

I'm looking to simulate a circuit in LTSpice which uses a U/D-style digital potentiometer like the Analog Devices AD5220. Is there an existing component model with this type of functionality? If not, ...
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2 votes
1 answer
26 views

Stability analysis of hybrid discrete-continuous systems

I'm trying to derive the overall state-space system model for a hybrid system, in order to plot its eigenvalues. The system is shown as follows: Which is originally from this paper: Modeling and ...
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2 answers
79 views

Flyback converter small-signal model

I am currently designing a flyback converter and I am interested in measuring the stability of the converter (with a Bode plot). I will try to connect an isolation transformer on the feedback loop ...
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1 answer
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Modeling a NAND flash cell (a MOSFET with a floating gate)

After checking the ADS component palette, I found there are some MOSFET models available but there are no NAND flash cell models. How do I create one? A NAND flash cell can hold different states (...
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-1 votes
1 answer
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Find the differential equation of a control system via its block diagram

I have this block diagram: I need to find the differential equation that represents the behavior of the control system, but I don't know what to do with the inner and outer feedback. I tried to ...
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SPICE Models with >3 Terminals for use in SIMPLIS

I'm trying to convert a GaN FET SPICE model to use in a SIMPLIS schematic. The SPICE model is based on a typical MOSFET model (G-D-S) but also includes the TJ, TC and SS pin, as shown in figure. I've ...
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3 votes
1 answer
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BJT Is Saturation current temperature dependence singularity

So, I am currently looking at the ways transistors change their parameters with temperature according to SPICE for a thorough investigation of synthesizer VCO exponential converter. Particularly, the ...
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2 answers
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Characterizing "quadratic current" in an NMOS

I'm designing an integrated circuit where a series of NMOS with their sources tied to GND and their drains tied together work as parallel current sources. The total added current \$I_D\$ that I'd like ...
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Matlab model: Continuous & Discrete-Time behaviour of a Switched-Cap. Integrator circuit

I would have the following question at the end of this text. To bring everyone to a common understanding, I need to first develop it a bit and make some statements. I tried to be as precise and short ...
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39 views

What is the mathematical equation/function for lithium ion battery recharge time in the constant-voltage phase?

I'm trying to program a simple two phase battery recharge model in Python where the constant current (CC) phase is linear with respect to recharge time and state of charge (charge capacity). However, ...
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38 views

What would be the best small signal model to the following LF RFID circuit?

I'm trying to analyse a LF RFID circuit's antenna of a TMS3705 base station using simulation. I want to estimate the frequency response and the Q factor. The intention is to do it for two different ...
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Keysight ADS User-Defined Models to AWR/Virtuoso

everyone! In ADS Keysight it is possible to create a model - the so-called User-Defined Model. This is C++ code that describes the Y-matrix of the component. Is there the same possibility in AWR ...
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How to control voltage at the output of the LC filter connected to the three phase inverter?

Let's say I have a three phase voltage source inverter with the LC filter connected to its output i.e. I have following circuit Suppose that my primary goal is to control the voltage at the output of ...
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What is the ABCabc model of the induction motor?

I'm doing research on induction motor parameter identification, and I found research matching my purpose, but I don't know how to build this "ABCabc model of an induction motor", which is ...
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Combining cascaded State Space models with Common inputs?

I am trying to work out how the following paper has formed its "Complete state space model" for the inverter equation (37): Paper: State space modeling of inverter based microgrids ...
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State space model of a PWM driven circuit

I am trying to write down the state space model of the circuit given below: As it can be seen above, a P channel mosfet transistor is driven by a PWM signal. I am trying to model the circuit ...
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1 vote
1 answer
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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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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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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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1 answer
60 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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25 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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2 votes
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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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3 votes
1 answer
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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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-1 votes
1 answer
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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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1 vote
0 answers
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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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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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1 vote
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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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3 votes
2 answers
129 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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1 answer
122 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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5 votes
1 answer
98 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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83 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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1 vote
2 answers
410 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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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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142 views

Dynamic model of the three phase inverter with LCL filter suitable for controllers design

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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1 vote
4 answers
141 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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0 answers
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"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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1 answer
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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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5 votes
1 answer
877 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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1 vote
1 answer
479 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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0 votes
1 answer
67 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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1 vote
0 answers
143 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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0 answers
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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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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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0 answers
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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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1k 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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2 answers
97 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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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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1 answer
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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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1 vote
0 answers
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IGBT modelling from datasheet

how to model igbt from the APT150GN120J datasheet. ...
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2 votes
1 answer
31 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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