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Questions tagged [simulation]

About tools to simulate circuits. Specify the tool used.

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40 views

PSpice - simulation worst case - delay on AND gate?

I have a question to someone who is familiar with PSpice analysis. I have a simple circuit as below and everything works good with "typical" simulation - dstm1 gives positive impulses continously and ...
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2answers
28 views

Is there a way to define enumeration for certain signals after simulation?

I have run some verilog simulations in questa simulator and while viewing the waveforms i see that it would have been easier for me to debug the signals had there been some enums defined for them (To ...
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1answer
65 views

DC/DC converter from 9V to around 180V - LTspice simulation

I am trying to simulate circuit from link: Nixie power supply, but I have come into some problems. I downloaded MC34063 from this forum and example in package is working perfectly. Below is my circuit ...
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2answers
81 views

ADS Simulation: Why doesn't the diode rectify the signal?

As titled, the diode in my half-wave rectifier did not rectify the AC signal. Vd1 is still AC signal. Therefore Vout ~ 0V. Why could that happen? The diode's parameters are SPICE parameters. The ...
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0answers
20 views

Multisim Transient time point did not converge (peak detector circuit)

I'm building a peak detector circuit with mcp6002 op amp. The signal is 8k Hz 20%dc square wave filtered through a low pass filter whose capacitor varies between about 10pf to 1000pf. The schematic is ...
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1answer
94 views

How does this BJT affect the circuit? If it does, how should I simulate on Circuitlab to see the effect?

I am trying to understand how NPN Q23 in the picture below affects the operation of the left circuit. If it doesn't then what we get is the circuit on the right with the only transistor now being Q30....
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1answer
34 views

Discrete simulation of 3-phase inductive load

I would like to make a discrete time simulation of a 3 phase inductive load but I am struggling with the problem. I have this Y configuration in mind. I'd like to simulate each current and Vn, given ...
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1answer
63 views

Problem in blocking and non-blocking - verilog

I have this code and I am having a problem in the product output, any ideas? I've tried a lot and it doesn't work.
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1answer
77 views

Significance of timing simulation for FPGA

I have started to wonder what is the significance of the timing simulation for FPGAs nowadays. I can easily justify what is the idea behind that by quoting some Xilinx materials: Performing a ...
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0answers
21 views

Fiterless Class D amplifier: the PWM and Switching stage

What is the minimum voltage and current to drive a MOSFET switching stage for a filterless class D amplifier having 86% efficiency? What ae the calculations needed to find this out?
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1answer
29 views

Altera FlipFlop stuck at GND

I'm trying to make a counter that counts: 0,1,2,3,4,5 I need this for a frequency divider of 6 So I made this table: From this I get: J0= 1 K0= 1 J1 = NOT Q0 AND Q1 K1 = Q1 J2 = Q1 AND Q2 K2 =...
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1answer
32 views

Sine source outputting wrong signal

I was trying to simulate a circuit on Capture CIS lite, but I kept getting an output signal which was nothing like I expected. When I tried putting the probe on the sine source, it seems like the ...
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1answer
57 views

Modelsim: resume simulation future

I have long running simulation in Modelsim for VHDL/Verilog designs. I want to know are there any way to save current simulation progress and resume it somehow in later time?
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2answers
83 views

How to simulate the exponential growth op-amp?

According to Wikipedia, the following is the exponential output operational amplifier. I would like to test this out in a simulated environment and see how this functions. For example give a sine ...
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1answer
25 views

Inconsistency in a simulation using Multisim

After simulating the following circuit in Multisim : I got these timing diagrams (1 ms/Div and 5 V/Div) : I think that the output Q is inconsistent , shouldn't it look like this instead ? :
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1answer
58 views

DC link capacitor for induction motor drive

I am simulating FOC drive for a 5kW,400V, 50Hz 3-phase induction motor. The drive algorithm worked fine when inverter was fed from proper DC source of suitable value. However, in practice, the drive ...
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1answer
74 views

Generating a realistic sine wave in MATLAB

I'm working on a simulation on MATLAB and I need a realistic sine wave which has harmonics. So I know there would be harmonics at 2f,3f... but I am not sure how to determine their amplitude. I tried ...
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1answer
25 views

How to Reconfigure a Current Sense Amplifier Pspice Model

I downloaded the .lib Spice library for the MAX4172 and imported it into OrCad, available from: https://www.maximintegrated.com/en/products/analog/amplifiers/MAX4172.html/tb_tab2 The library file ...
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1answer
54 views

Frequency dependent capacitor for AC sweep analysis in LTspice

I need to model a frequency dependent capacitor for AC sweep analysis in LTpsice. I see that it is possible for inductors with GLAPLACE component, but I don't find anything about capacitors. The value ...
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1answer
52 views

lt Spice simulation duplication error

I am new to using LT Spice. I have imported an operational amplifier. When I try to run a simulations response I received an error (shown in the screenshot.) It says Netlist Error: Duplicated ...
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0answers
16 views

How to simulate an AC source function generator circuit?

Hi I'm trying to simulate this circuit on LT Spice, but I'm not sure what I'm doing incorrectly since it's not the graph that I want. Also how would I compute the phase difference between the input ...
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2answers
61 views

\$pV/\sqrt {Hz}\$ in Power Spectral Density

I am trying to plot a Noise Spectral Density from 10 kHz to 1 MHz. The Graph shows a cure which at 1 MHz the noise is 76 pV/rootHz. I am unable to understand that unit definition here. Becuase the ...
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0answers
57 views

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
63 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
36 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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0answers
24 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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2answers
48 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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1answer
94 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
32 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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0answers
17 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
25 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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0answers
38 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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0answers
35 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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0answers
57 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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0answers
51 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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0answers
51 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
182 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
76 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
69 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 ...
2
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1answer
860 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
2k 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
67 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
341 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
136 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
42 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
28 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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1answer
104 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 ...
2
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1answer
171 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
405 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 ...