Questions tagged [modeling]

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

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63 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
66 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
46 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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68 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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23 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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106 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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44 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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36 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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46 views

Equivalent Circuit based on Current Response

I am attempting to model a real-world device that I have built. I want to develop an equivalent circuit that I can then tweak to understand its expected behavior in different situations. The image ...
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28 views

Any recommendations for gas discharge tube mathematical modeling references?

Any recommendations for gas discharge tube mathematical modeling references? Lieberman and Lichtenberg (2005) Principles of Plasma Discharges and Materials Processing (see @AdilMalik 2020-12-21 ...
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318 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
80 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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76 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
317 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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53 views

IGBT modelling from datasheet

how to model igbt from the APT150GN120J datasheet. ...
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1answer
21 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
953 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
90 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
61 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
21 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 ...
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2answers
66 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
84 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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25 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
46 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
124 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
77 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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47 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
460 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 ...
2
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2answers
214 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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1answer
31 views

Information on LTSpice switching regulator macromodels?

I have read this Design Note 12 from Linear Technologies titled “An Op Amp SPICE Macromodel”. I was wondering if there is similar technical information about the macromodels of switching regulators (...
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3answers
200 views

Where does Zi = hie+1(1+hfe)RE come from in a BJT from Hybrid Model?

I've been struggling to understand how to get to this expression without knowing about re model (actually, still knowing about it, I can't get to understand this). In a BJT in, how does one get to Zi ...
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1answer
63 views

LDO datasheet parameter extraction

In similarity to previous question Ron setting of LDO. Unfortunately I assumed gain of the error amplifier and trial and error method I matched with dropout curve in the datasheet. Query: How to ...
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2answers
344 views

Count the clock cycle using LTSpice

I had been using these modeling technique for counting number of clock cycles. Delay is created and inverted - to get small positive edge of the clock and count numbers is charged based on the number ...
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2answers
36 views

Motor specifications - how to compute allowable running time for power levels between the continuous and peak specs?

Say a motor is rated for 20 N·m continuous torque, and 35 N·m peak (peak = for no more than 30 seconds). Alternatively it may be specified at with continuous/peak currents, but if the motor efficiency ...
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536 views

Are my equations correct for a simple lithium ion battery model in Python?

I am trying to create a simple battery model in Python based on the RC circuit from, http://firsttimeprogrammer.blogspot.com/2015/07/electric-circuits-101-rc-and-rl-circuits.html. I have attached ...
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1answer
280 views

Converting a Lithium Ion Model from a Foster Network to a Cauer Network

It is possible to convert common thermal RC-models between the Foster form and the Cauer form, as seen here: I was wondering if and how this is possible with lithium-ion cell models, which commonly ...
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1answer
181 views

Capacitance multiplier

In my device I'm using a "capacitance multiplier" to filter DC-DC output voltage. That's my schematic: In Multisim simulation I've achieved necessary output parameters, but when I soldered my PCB and ...
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2answers
192 views

Lumped parameter vs transmission line model for a piece of cable

I would like to model a piece of cable (less than 5m) over a frequency range of DC to \$1\mathrm{MHz}\$. I am however doubting if I can approximate it by a lumped parameter model (mainly at \$1\mathrm{...
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75 views

RF Communication Simulation Software

I was wondering about free software for modelling RF communications, such as creating a transponder equipment line up, changing equipment parameters etc and modelling performances like BER, S/N, Phase ...
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1answer
91 views

Parameter extraction of MOSFET

I need to extract the parameters of MOSFET to study how all these parameters are getting affected by stress on silicon chips. If you guyz have good reference from which I can look into this topic?
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1answer
80 views

Diode N value less than 1 for temperature sweep

I have seen many manufactures using diodes N<1 for their PSpice model and LTSpice model diodes so I tried to run temperature sweep in LTSpice and PSpice In LTSpice if N<1 DC sweep eg:1m with ....
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3answers
800 views

How to model a real diode 1N4148?

In my university EE lab we were working with a 1N4148 diode to rectify half a sine wave and measure the RMS value of the current in a simple circuit. To the left is the circuit we had to make and to ...
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2answers
61 views

References for writing spice model code?

I'm currently looking into building my own spice models from datasheet specs to ensure accuracy. Are there any references for this sort of thing? I've looked around online and haven't found anything ...
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1answer
104 views

In practice, what is the difference between the “nominal plant model” and the “plant model”?

I am reading a book on nonlinear control and disturbance rejection, and in many examples, they distinguish between the "plant model" \$G_p(s)\$ and the "nominal plant model" \$G_p(s)\$. They also add ...
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1answer
532 views

Incorporating ALD1106 SPICE model in LTspice

I'm trying to incorporate a SPICE model of an NMOS IC, the ALD1106. I've used it before in class, but it's been so long that I've forgotten how to incorporate the files into LTspice in order to ...
3
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2answers
616 views

What is conductor to conductor to shield capacitance?

I am using 6.5 ft (2 meters) BELDEN 9154 shielded twisted pair cable for a sub 1 MHz application and I wanted to make a model of the cable for some simulations. The datasheet of the cable lists two ...
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1answer
84 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
1k 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 ...
3
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2answers
106 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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