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Questions tagged [simulation]

About tools to simulate circuits. Specify the tool used.

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Docs, Tutorials, or examples for electrostatic sim in FEMM from LUAscript

I am looking for any docs, tutorials, or examples for electrostatic sim in FEMM from LUAscript. I've found plenty of information on magnetic sims, but very little on electrostatic, and even less ...
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1answer
39 views

Simulation discrepancy in Qucs with 2N3904 transistor

I've been testing out a few circuit simulation applications and ran into an unusual issue with Qucs and the 2N3904 transistor. For a simple NPN transistor circuit with load resistor \$R_L\$, base ...
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1answer
19 views

Using connected PC keyboard input for VHDL Simulation

I am working on a project for school that will involve an input from a push button or related device. We have only a few Spartan boards available, but we have access to Xlinx Vivado to simulate an ...
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20 views

What is the electrical meaning of Vdsat shown by Spcectre?

I am having trouble understanding the meaning of the Vdsat parameter which the simulator shows for the mosfets. It clearly does not equal the textbook definition of the drain source voltage needed to ...
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23 views

How can I force LTspice to redraw a plot during a long simulation?

Sometimes during long simulations, the LTspice plot window will display a yellow "broken" icon, and/or simply not render parts or all of the data. Sometimes the axis are missing, sometimes it only ...
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19 views

Singular Matrix: Check node warning

I'm trying to design a regulated power supply. When I try running the following circuit in LTSpice, I get the following error message: ...
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2answers
20 views

LTSpice Error: timestep too small

This is the error I see: This is my Simulation Command. What is the issue here?
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42 views

How do I make a stepper motor compass cross 360° to 0°? [migrated]

I am building a wet compass for a flight simulator. I currently have a stepper motor functioning well with the simulator but at the point of crossing 360° to 0° the stepper does a full reverse 360° to ...
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22 views

Sigma Delta in simulink sensitive to computational delays?

I am trying to design a simple sigma delta modulator (SDM) with some additional logics. I designed a first order SDM in simulink - which works fine, as shown below: But problem comes when I add some ...
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1answer
55 views

Is there a wrong way to wire a potentiometer?

I'm using Circuit Wizard to simulate a circuit and I'm trying to understand how to wire a potentiometer. While trying to learn how current flows through the pot, I found that it works in both ...
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2answers
28 views

ADC error SPICE simulation

I am attempting to do a Monte Carlo simulation of a basic current measurement circuit using SiMetrix. The current goes through a sense resistor, amplified by an op-amp and then to an ADC. I'm trying ...
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37 views

combinatorial loop and simulation error

There a couple of problems, I hope that can be solved. The following warnings: ...
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0answers
12 views

GF 22FDX - leakage during power rampup - run time issue

Hello, I was running power rampup simulations on GF22FDX to see leakage. I have used kernels (individual placables and not full macro). Its taking huge time to complete. It got killed after 1 day ...
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1answer
21 views

How to simulate a component hspice model in multisim

I'm trying to simulate TS5A22364 and they have hspice and ibis models, and CAD model .bxl in Multisim. Is it possible? I have tried to add the package model but I don't know how to add the .bxl model ...
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31 views

How to build an RFID passive circuit in ADS?

I want to build/design an RFID passive circuit using ADS, for this I need an RFID tag and a RFID reader. Inside the tag, there will be the RF module which contains modulator, demodulator, rectifier, ...
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0answers
24 views

HFSS - 50 Ohm Coaxial line terminated with 50 Ohm impedance boundary. |S11| too large

I'm modelling a 50 Ohm coaxial cable in HFSS that is excited with a waveport and terminated with a 50 Ohm impedance boundary. The Z0 of the wave port is 50 Ohms (refined through tweaking dimensions ...
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34 views

Motor or a Servo

I'm looking to build a motorized throttle quadrant replica of a Boeing 737 that would connect to Flight Sim. I do have a quite good idea of what I am trying to do and how to do it but I am fairly new ...
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1answer
36 views

Cosimulation Error on Advanced Design System

I want to use BLF2425M9LS140, Power LDMOS transistor, to do cosimulation on ADS. I have got transistor's PCB design from its site and have done required procedure but when I try to convert layout to ...
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43 views

VHDL test bench doesn't output/print warnings for timing violations

Here is my situation: I want to simulate a presettable 11-bit counter made up of three binary counter CD74AC161 chips. I also want the simulation to detect timing violations (setup time, hold time, ...
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33 views

High Voltage Cascode with MOSFET LT Spice Simulation

I'm an electronics engineering student and want to develop a high voltage switch with normal Si N-MOSFETs. After some research, I discovered cascode switches for this application. Most of these ...
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45 views

A voltage-controlled electronic equivalent of an SPST switch using MOS/BJT/Diodes

In order to use a close equivalent to ideal SPST switch for basic circuit simulations, I had been using a four-terminal voltage-controlled switch available in Ltspice simulator with quite less rise ...
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1answer
115 views

Vivado simulation stuck at 0 fs

I am trying to simulate a D flip flop using Vivado 2018.2.2. But upon running the simulation a window pops up stating Current time: 0 fs. The program doesn't freeze, it just doesn't progress. Here is ...
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1answer
74 views

Why do these two resistor networks measure differently?

Why do these two resistor networks measure differently? Aren't two 100k resistors in series supposed to be equivalent to a single 200k resistor? These are being simulated with Circuit Wizard.
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2answers
67 views

Why does this resistor network simulate differently from the physical package?

I am trying to simulate a Bourns 4310R-R2R-104 dual terminator 104 circuit resistor network. According to the datasheet, the circuit looks like this: When I read the resistance between pin 1 and pin ...
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1answer
239 views

CMOS implementation of D flip-flop

I am trying to implement edge triggered flip-flop using CMOS logic. Google search provides following diagram on wikipedia: Upon simulating this using tanner, I find out that output resembles positive ...
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1answer
1k views

What breadboard simulation software is this?

I'm not familiar with what software is available and cannot recognize the origin of this diagram. Does anyone know what software this is? I'm only guessing that it can perform simulation; it may just ...
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2answers
62 views

Verilog circuit not synchronous

I am new to Verilog and I was trying to make a Decade counter. I simply took the reference of an actual circuit that implements the decade counter using JK-Flip Flops. So I wrote a sub-module for JK-...
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1answer
216 views

LTSpice IV for OS X (oct 2, 2018 version) crashes on macOS Mojave 10.14

I downloaded the latest LTSpice IV for mac OS, I'm running mojave on a MBP. It is crashing in my setup, apparently as soon as it opens the plot window. The simulation starts running, but when it's ...
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1answer
47 views

Problem with IR2112 on Proteus

I am designing a pure sine wave innverter and am using IR2110 as a driver for the H-bridge. On protues however only IR2112 is available so i used it. I managed to get all the connections in a correct ...
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0answers
29 views

Problem opening a PLECS blockset in MATLAB

A friend of mine sent his simulation of a converter for which he had used PLECS. It is in the format "example.slx". I have MATLAB R2017b. I downloaded the PLECS block set for MATLAB and activated it ...
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0answers
24 views

How can I get/calculate simulink bldc parameters

I tried to get the parameters for a bldc simulation https://de.mathworks.com/help/physmod/sps/ref/brushlessdcmotor.html I tried to find a similar motor to the I need (500 W, 20-25 Nm, geared bldc) ...
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0answers
43 views

vhdl testbench data type confusion

I am trying to simulate the XADC in vivado I have my testbench code here ...
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0answers
49 views

How is Falstad online circuit simulator helpful, and is there a simple PC application similar to it? [duplicate]

I found this Falstad online simulator online and felt that it is interesting. What do you recommend about it for beginners like me? Is it a beneficial tool to use? Is there a simple PC application ...
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1answer
101 views

Glitchless output on PIC10F

I'm learning how to program a PIC10F220. I'm using a PICkit 3 programmer and running physical experiments, as well as running the simulator in MPLABX. One thing I want to do is set the proper level ...
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1answer
126 views

LTSpice simulation stalls after 100ms transient with 'Heightened Def Con'

I simulate a system of two mutually delay-coupled electronic clocks (DPLLs - digital phase-locked loops). This worked well and also in reasonable time so far. However, moving into a particular regime ...
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1answer
173 views

How to change the top directory in LTspice?

I installed LTspice in C:\Program Files, and when I go to "search components", the top directory is C:\Documents. How can I ...
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1answer
28 views

LTspice parametric sweep: how to force the simulator to continue with the next step?

I'm running transient simulations as I am sweeping a couple of parameter values (resistances, capacitances) to give a first hint about what range of values make a certain circuit stable. In addition, ...
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1answer
100 views

How do I override generic values in a VHDL testbench?

I am new to VHDL, and I'm working with an off-the-shelf UART block. I'm trying to create a test bench and override the data width, but I get errors saying that my signals are undeclared: ERROR - C:/...
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1answer
86 views

Can someone explain how frequency and inductance affects this pair of coupled inductors?

I am simulating this simple circuit on PSIM; a single-phase AC voltage source connected to the primary of a pair of coupled inductors, with a 12 Ohms load on the secondary side. I want to increase the ...
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4answers
155 views

Integrating op-amp not understood

I am trying to use an integrating op-amp. What I want to do is apply + 0.5 V for 40 us and afterwards apply -1 V for 20 us. Since the integration sum over one period is zero, thus if my reasoning is ...
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80 views

Why does this square wave suddenly become “fat” in iCircuit oscilloscope display?

I'm using the iCircuit app to learn some basics. One thing that is confusing is the scope trace will unexpectedly get "fat" even though the circuit is unchanged - example in picture below. I've ...
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1answer
66 views

Voltage controlled switch always closed in simulation

simulate this circuit – Schematic created using CircuitLab I have made the above (useless) schematic in LTspice. This after running into issues with a full schematic. The idea is to let e pulse ...
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1answer
85 views

How to calculate voltage ripple in a BLDC filter module?

Hi I need some calculation for my thesis. A found this picture on the internet. My project is almost the same. It's a pi filter for a 3 phase BLDC. The peak current is 60A. It runs from 12V car ...
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1answer
99 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
112 views

How does SPICE calculate Drain current of a MOSFET model?

I am trying to use a MOSFET model for constructing transistor level circuits in ADS. (For instance, an amplifier). I saw that we could import transistor libraries from various locations (https://www....
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1answer
56 views

Can you change the parameters of all of a certain kind of component in LT Spice?

I was wondering if there was a function in LT Spice that I don't yet know of that would allow you to either select a bunch of components, or all of a certain kind of component (capacitor, resistor, ...
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0answers
31 views

Meaning of these terms - Simulation of vector control (FOC) of induction motor?

I'm having hard time doing simulation of vector control for 3 phase asynchronous machine. I was studying MATLAB - Simulink simulations available already on MathWorks site but I couldn't understand ...
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4answers
1k views

Create Circuit Simulation

I wonder if someone can help me. How will one go about to create a simple circuit simulator? Similar to Multisim, just a lot simpler! Basically, I only need resistors, capacitors, inductors and ...
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1answer
78 views

Simulating a variable mutual inductance model

Can we simulate a time varying mutual inductance in Matlab Simulink (or any other simulation tool). Matlab Simulink has a variable inductor, but I could not find not mutual inductor.
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1answer
44 views

Making sense of TI power-designer sims

After a day of struggling with trying to simulate an LM2678 based buck converter (see: this post) another user suggested using TIs online power designer web bench tool to simulate. Selecting a design ...