Questions tagged [simulation]

About tools to simulate circuits. Specify the tool used.

Filter by
Sorted by
Tagged with
1
vote
1answer
51 views

Can someone help me figure out why a simulated circuit I made wont work on Tinkercad?

I'm trying to build a circuit on Tinkercad, which I'm pretty sure is known as an astable multivibrator, but whenever I try to simulate it, either the says capacitors are inversely polarized, the LED's ...
0
votes
0answers
75 views

Xilinx FPGA “X” state in simulation and didn't find the bug

I wrote an ASRAM in VHDL and simulate it. I get many "X" if I try to read. I know that this problem is caused by too many drivers on one net but I didn't find the problem nor solved it. Appreciate ...
0
votes
1answer
28 views

KiCad Simulation VSOURCE Triangle waveform

I want to simulate a second order active low-pass filter in KiCad, using the internal spice-based simulation tool. The input signal must be a triangle waveform of 30kHz and 0,5 V peak to peak, and the ...
2
votes
1answer
87 views

How to wire up a street light to change lights in specific states (digital circuit)

This is the final project for the only electronics course in my career. I have never taken any other electronics course and I'm seriously at a lost here. I need to score 100 here to pass the course. ...
0
votes
0answers
21 views

How to compare 2 sets of components values in QUCS?

I have designed a filter under QUCS. I have trace the frequency response with one set of values. Now I want to compare the response of two different sets of values by drawing the 2 frequency responses ...
0
votes
2answers
22 views

Explanation results of RC simulation wih LTspice/Micro-cap

I built a basic schema with resistor, capacitor, ground and a battery in LTspice and MicroCap. I used transient analysis mode. I expected to see on a chart decreasing current and increasing voltage ...
5
votes
1answer
61 views

How to generate different noise in LTspice from run to run

I'm trying to simulate noise in my circuit, and ideally want to get a histogram of a certain parameter affected by that noise over many runs. However, when I use the white() command in LTspice, or ...
0
votes
1answer
43 views

Does any software exist which can convert SPICE (or other EMTP) models into Verilog/VHDL models?

For the purpose of real-time simulation, it is sometimes advantageous to use FPGAs to simulate electrical circuits. The idea would be to discretize the equations that define the model, and then ...
0
votes
2answers
54 views

I don't know whether HD44780 LCD is correctly initialized in Proteus

I'm trying to control an HD44780-based LCD in Proteus with 4-bit interface. The problem is that the simulation log gives me a series of messages, which I think means that I'm not sending the commands ...
0
votes
1answer
35 views

What are some good logic simulators for experimenting with multiplexers? [closed]

We've been tasked with showing the numbers on a 7-segment led display with dual 4x1 multiplexers and 3 variables. Our first try was a failure and we won't have the opportunity to experiment in the ...
0
votes
0answers
30 views

proteus just stopped simulating on firmware projects

I am a student of computer engineering I was working on my assignments and project on proteus using microcontroller 8051 and using Keil micro vision compiler for c coding. I was working on my projects ...
2
votes
1answer
34 views

LTSpice: why does my .MEAS 3dB calculation disagree with the cursors on the plot?

I'm exploring the .MEAS command with the following simple BJT Class-AB amplifier: And am getting the following results from my ...
3
votes
2answers
99 views

Complex Voltage and Current in Steady State DC Circuit with Nonlinear Component

I was trying to solve the following circuit that has a nonlinear component: simulate this circuit – Schematic created using CircuitLab B is the nonlinear component with the following ...
2
votes
0answers
53 views

LT-Spice wont open file -> File limitations?

I am currently working on bulk simulations. For this I created a Python script which writes in the .asc files of LTspice and creates long tables, which are stepped through with the run variable. This ...
0
votes
0answers
19 views

Vivado Simulator copy multiple values

I'm simulating a SystemVerilog based core on Vivado 2019.1. I can copy the value of any signal simply by select+right click+Copy Value, but when I select multiple signals (for my case I need to select ...
1
vote
1answer
40 views

RLC circuit (simulation in Scilab)

I tried to solve a RLC circuit and I obtained the matrix. I tried to do a circuit in Scilab, but I didn't obtain a sinusoidal response. The output is in the capacitor and the input is the step ...
0
votes
2answers
51 views

Overlay plots from PSpice - SIMetrix or SIMetrix to PSpice

I wanted to verify the accuracy of a identical model which I modelled, between PSpice and SIMetrix simulator I ran model in Pspice and SIMetrix separately and probed required nets (net names are ...
0
votes
1answer
33 views

FOC current and speed limits

I am trying to simulate BLDC drive using FOC with svPWM. The drive works very well in the continous operating regions, however i also want to include current and speed limits on the simulation. I have ...
0
votes
0answers
19 views

how to overcome the slow pace of my simulink model?

I have run the solver profiler to debug where my simulink model stuck and take very long time to simulate. I found out it is the diode model that I model as following: It runs fast on its own. ...
1
vote
2answers
58 views

Is there a way to include a legend in LTSpice graphs for a sweep variable?

I am using LTspice parametric sweeps to generate a series of different cases and plot waveforms and measured values. I have two sweep variables and 5-6 points for each variable. Now I want to see how ...
1
vote
1answer
48 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 ....
0
votes
0answers
8 views

AC magnitude sweep in modelsim run error

I am trying to perform an AC magnitude sweep at a fixed frequency in NI modelsim. Using the Parameter Sweep section of Analyses and Simulation menu. But it gives the error " there are no valid output ...
0
votes
3answers
75 views

Why does the power supply into the op amp change from DC to AC?

This is an AC power supply made from transformers, and is rectified into a positive DC supply and negative DC supply. Without the op-amp the supply generates ~15V and ~-15V. However, when the op amp ...
1
vote
0answers
22 views

Higher order effects of CTAT and PTAT when testing a BANDGAP

I want to use candence to simulate the real behavior of a voltage reference and so far I found circuits that are based on the ideal models. What non linearities can I introduce in this ideal model ...
0
votes
0answers
37 views

How does a high pass filter and a low pass filter work for an amp?

I'm researching how to incorporate treble and bass into an amp. X1 is for bass, X2 is for treble and X3 is for volume. Intuitively, for me, if a high pass filter only allows frequency above a ...
1
vote
1answer
34 views

Non inverting op-amp gain LTspice?

This configuration of OPA134 in LTspice has have a gain of 1.5 and hence should have a voltage output of 3. However it does not. Why? Spec: http://www.ti.com/lit/gpn/opa4134 Spice model: http://www....
2
votes
1answer
112 views

Dead-time in Full Bridge Inverter (LTSpice Simulation)

I am trying to generate a dead time between two switching legs in the conventional full bridge inverter. However, by simply including the delay block for one pair of switches - just shifts the signal ...
1
vote
0answers
29 views

Are there MOS VLSI Process Design Kits (SPICE models) for free SPICE simulators?

I want to do some proof-of-concept work in IC analogue IC design. I know that plenty of free circuit simulators exist (LTSpce, NgSpice etc.), however they are meant for PCB simulation and most perform ...
0
votes
1answer
51 views

Simulation of the Micro-kinetic generator

I am simulating the block diagram of the Autoquartz system during unwinding in Simulink. I want to get the current of microgenerator (Ibus), but I get an oscillating pattern, which you can see here ....
1
vote
2answers
82 views

Could someone answer my questions on a transformer with regulator circuit in LTspice?

The circuit itself is a UK mains power supply turning 230Vac to 20Vdc. The first section is a transformer. The second part is a bridge rectifier, it then moves onto a voltage regulator by the name of ...
0
votes
2answers
42 views

LTSpice .Step (2nd dimension) Syntax Error

I am currently attempting to use the step function to simplify/increase portability of some of work circuits. Can't share the exact circuit, however I am simply attempting to define a variable/s, use ...
0
votes
1answer
40 views

How to apply Kirchoff laws to form differential equation for RC circuit with a variable applied 2nd voltage?

I'm trying to create a model for how a capacitor charges and discharges in an RC circuit in response to an applied "control voltage" V2. For this, I want to form ...
0
votes
2answers
53 views

BJT Transistor Simulation at Multisim: Why is Ie not equal to Ib+Ic?

I used current probes and Single Frequency AC Analysis(where Frequency=Freuqency of the AC Voltage Source), but the Ie, Ib, Ic show that Ie is not equal to Ib, Ic? Hope someone can clarify :)
1
vote
1answer
30 views

How to use a parametric value within PULSE voltage source in LTSpice?

I would like to use a parametric symbol for the period value of the PULSE component in LTSpice but so far I have been unsuccessful. currently my source is: ...
2
votes
1answer
124 views

Good free simulator for dc sweep

I need to do a DC sweep of a circuit involving a NMOS, but my version of Multisim doesn't have that option. Which free simulator would you recommend for a DC sweep?
0
votes
1answer
30 views

NOT valid mode type SIMetrix from Netlist

I am trying to run PSpice netlist in SIMetrix .cir and it says NOT valid mode type SIMetrix from Netlist, do we have to add any command other than this.
1
vote
2answers
93 views

Is it better to combine logic for two flip flops in a single always block?

I have always used separate always block for infering different flip flops when they dont have much in common. ...
1
vote
2answers
55 views

LTSpice Simulation - How to design pulldown with voltage supply

I am trying to simulate a circuit which should pull the supply down. Problem here is, that the supply is a not current limited and the whole voltage is dropping accross the 0.1Ohm RC of Q4 and the ...
1
vote
0answers
46 views

Simulation of an Electric Shock Box

This is the continuity of this: Understanding Electric Shock Box Circuit I really don't understand what is going on, so I was hoping that simulating the circuit in Proteus might help What parameters ...
3
votes
1answer
89 views

SiC MOSFET SPICE model not behaving properly

I have been trying to simulate a fully controlled full bridge using SiC MOSFETs and so far haven't gettng at least expected results. So I tried to check what is happening using a single MOSFET and a ...
1
vote
4answers
40 views

LTSpice multiple load iteration

I am trying to simulate a load in two different instances. In first instance i want the load to have a constant dc value of 2A, and in the second instance PULSE(2 11 1.06 100n 100n 0.30 0.8 1). I ...
0
votes
2answers
82 views

How can I simulate this circuit?

I've designed this circuit in EasyEDA and first tried to simulate there also, but it didn't have subcircuits for any of the IC's. Is there any simulation software that would simulate this circuit as ...
9
votes
0answers
139 views
+50

Calculate sheet resistance in finite element method

I have a simulation with several polygonial mesh cells (Voronoi-mesh) and their centers of gravity \$P_i\$, each with its own electrical potential. Every cell has the same height \$h\$ all over. How ...
0
votes
1answer
43 views

Verilog: Register File assignment not updating on clock pulse

I wrote some fairly simple code in Verilog to implement a 32-bit deep, 8-bit wide register file. However, when I actually run a behavioral simulation of the thing the two data-read lines (rd0_data and ...
0
votes
2answers
37 views

Simulate input resistance

I am quite new to electronic engineering. I have a circuit and I have calculated the input resistance to be about 0.65 kOhm. To verify the calculation I would like to simulate the circuit. Is there a ...
2
votes
0answers
27 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 ...
0
votes
1answer
55 views

What is the most straight-forward way to simulate this circuit?

I would like to verify the function of this circuit, as well as determine the power usage and heat generated by each component. (I need the latter for doing a thermal analysis) The circuit has been ...
0
votes
0answers
43 views

bode plot of LM3481 as boost converter

I have simulated an open loop boost converter using LM3481 average model, given by texas instruments and I got a very strange bode plot (More precisely, strage phase response), please can you tell me ...
0
votes
1answer
144 views

How to power schmitt trigger in LTspice with negative voltage?

I use CD40106 model in LTspice for schmitt trigger, but the circuit I want to simulate has -5 and 0 V levels, CD40106 only accept positive value for VDD and there is no other param to change the value ...
0
votes
0answers
16 views

How to use the dumplog64 to open the contents of the WLF file as per specified time units(us, ms,ns)

I have used the command dumplog64 to open the contents of the specified WLF file in a readable format in Notepad. I have found the readable format of wlf file in the below format in Notepad. For ...