Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [simulation]

About tools to simulate circuits. Specify the tool used.

3
votes
1answer
54 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 ...
1
vote
2answers
56 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....
0
votes
1answer
22 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, ...
0
votes
0answers
26 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 ...
5
votes
2answers
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 ...
0
votes
1answer
57 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.
0
votes
1answer
42 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 ...
-1
votes
0answers
43 views

SystemVerilog: VCS detect combinational loop

first of all I'm still learning English so thanks for your patience I'm debugging a large code, I did a testbench for every module and I think they work as intended but when I connect them together ...
0
votes
0answers
19 views

Simulating Li-ion charge management IC

I am designing a power supply for a system which will require a 5v line and a 3.3v line and the ability to provide these lines from mains or a backup lithium-ion battery pack. The power supply must be ...
0
votes
1answer
49 views

why does current flow thru a mosfet contrary to SPICE results

SPICE simulations with LTSPICE showed no current flows thru drain & source of an enhancement n-channel MOSFET with using its SPICE model - yet hooking up 5v 2A power supply across an actual device ...
0
votes
1answer
42 views

Can Orcade (PSPICE) actually simulate MOV(Varistors)?

I am using Cadence-Orcade Lite. In it I have a circuit in which I want to note the behaviour of varistors (MOV, PSPICE models exist in Orcade for various varistors). I am using LS40K680QP/EPC Model ...
0
votes
1answer
80 views

LTspice (XVII) Use component instance name as a parameter

I am trying to to simulate a ferroelectric capacitor using simple schmitt triggers subcircuits : simulate this circuit – Schematic created using CircuitLab I would like to pass {R1} as a ...
0
votes
1answer
59 views

Where to find Simulation models of Electrical Components?

i have been working on altium designer to make schematic, pcb and simulate the circuit. I have used some components like Varistor for which simulation model is not present in altium, i tried as much ...
1
vote
1answer
99 views

LT spice not predicting instability

I'm trying to make a linear regulator using an op amp and a pass transistor. Here is the circuit: From my limited understanding you can predict the stability of the circuit's feedback loop by ...
0
votes
0answers
17 views

chaning fuse bytes in stimuli file in atmel studio simulator

I'm writing a stimuli file for debugging a code wrote for atmega168PA. In this stimuli file I want the lower fuse byte to be set automatically so I don't have to do it manually every time. I know that ...
0
votes
1answer
29 views

Is there a way to suppress the output when compiling multiple vhd files except for errors?

I have a compilation script I run before simulating on QuestaSim 10.7: ...
0
votes
0answers
27 views

How to model parallel dc-dc converters (transient analysis)

I would like to simulate two dc-dc converters in parallel using my own c++ algorithm. At the moment I have created averaged state-space equations for both converters, but struggle to get my head ...
0
votes
1answer
66 views

Why are my p-channel mosfets cutting off in LTSpice even though Vgs is negative?

I'm running into a weird bug. Part of me thinks that it's LTSpice that's wrong, but that seems unlikely. I'm working on the circuit below, to be able to switch between feeding my voltage regulator ...
0
votes
0answers
20 views

How to get IC IR215x in proteus or multisim?

I need to use a high power IC IR215x for oscillation in half bridge circuit for Compact florescent lamp circuit but I can't find this series in multisim or proteus for simulation. Is there any way I ...
0
votes
1answer
43 views

High Vds across MOSFET in saturation mode in Flyback converter during simulation

While simulating a flyback converter, I find that even in saturation mode the MOSFET, in spite of having Rds(on) around 0.74 ohms and the Ids = 5.75mA, is dropping almost the entire drain supply input ...
2
votes
2answers
108 views

Opamp current source stable in simulation but unstable on prototype

I've tried to build this opamp/mosfet current source, and been struggling to make it stable. When simulating the open-loop gain in PSpice. I've set it up like this, which should give Vout = -AB at the ...
0
votes
2answers
38 views

Modeling impedance matching network

Background I'm looking at the RF (LNA_IN) pin of ESP32 as described in esp32_hardware_design_guidelines. According to this document, the output impedance of the RF pins of ESP32 are (30+j10) or (...
0
votes
2answers
99 views

Discrepancy between RTL schematic and Behavioral simulation in Vivado

I'm having a strange issue with a simple Vivado (2015.3) VHDL simulation. This code: ...
2
votes
2answers
24 views

TL494 minimum operating voltage VCC

Has anyone operated TL494 on +5VDC practically as it works in simulation software ? minimum operating voltage indicated in datasheet is +7VDC . please confirm.
1
vote
2answers
53 views

DC solution failed using EasyEDA

I am trying to simulate an IR sensor circuit as described here: https://circuitdigest.com/electronic-circuits/ir-sensor-circuit-diagram I am using EasyEDA for this purpose, and the following is my ...
0
votes
1answer
41 views

Inductor dc resistance simulations

How can I simulate the dc resistance/R_dc of a spiral inductor? Here's the circuit I have: I simulate the inductor with a dc source and get the series current from a I_probe. Then calculated the dc ...
0
votes
2answers
87 views

Import step model into HFSS [closed]

I have a step file and I want to simulate it in HFSS but it seams that the structure it is not made with solids, but with attached sheets because when I import it in HFSS I cannot define materials and ...
1
vote
0answers
57 views

vhdl oneline pulse simulation

I wolud like to use simple oneline code snippet for generating single clock cycle positive pulse pulse <= '1', '0' after CLK_PERIOD; However, it is not ...
2
votes
2answers
159 views

OPAMP saturating when output is negative, simulation is OK

The schematics: It should convert 0-3.3V input from the DAC to -4.1 + 4.1V (roughly) The positive part works great, the negative output voltage saturates at -2.95V. Is it ok? The simulation looks ...
0
votes
1answer
26 views

Is post fit simulation using timing netlists necessary although design meets setup-hold time requirements?

In a purely synchronous design, if the design has positive slack for setup and hold times, it means that it meets timing. Therefore, provided that we have carried out static timing analysis and are ...
2
votes
0answers
70 views

Mextram Spice Model for Transistor

Where should I look for a Spice Mextram model for commercial transistors, such as the FMMT415? or Should I try a more advanced analog simulation software, incorporating Mextram or similar transistor ...
0
votes
0answers
36 views

Simulation not giving proper result in orcad

I tried to simulate TPS61021A boost converter in orcad but not working properly.As per datasheet http://ti.com/lit/ds/symlink/tps61021a.pdf it should give 3.3V output. Received this error is PSPICE A/...
0
votes
1answer
129 views

LTSpice capacitance dependend on voltage source

I am looking for a way to change the value of a capacitance dependent on the voltage source of the circuit. How do I create a voltage dependent capacitor in LT spice? Edit: Two capacitances in a row ...
0
votes
1answer
34 views

transient noise plot in virtuoso

I was simulating a transient test on an SRAM cell, added a transient noise of 1-30MHZ frequency with 100 multiple simulations and calculated a VQ-QB graph(dots). I want to be able to only plot the ...
0
votes
1answer
57 views

Is there anybody can show me how the voltage distribution of this MOSFET?

I have a problem to solve. Below is the my question I want to see how the voltage distribution of this mosfet. Like this(below) at this case, it's e-Density. (It's my school's data, I can't run ...
0
votes
0answers
34 views

Switching power supply with PFC equivalent schematic

I need to simulate inrush current of SMPS with power factor correction. I hope that it is possible to put rectifier bridge, capacitor and, probably several additional components, to simulate the ...
0
votes
0answers
23 views

Equalisation and Pre-emphasis for high speed transceivers

How can we see the effect of equalisation and pre-emphasis in simulation? Like equalisation is used to overcome the losses which may be because of : Signal Attenuation Reflections Intra-pair ...
0
votes
1answer
48 views

Is LTSPICE not taking into account power supply limitation while doing AC analysis

I have a problem witht the AC analysis of a circuit. The circuit is a voltage driven constant current driver: It is intended to drive a constant current into L1 (R1 being the series resistance of the ...
1
vote
1answer
251 views

How can I use/model a custom diode in LTSpice?

I would like to simulate the behaviour of a zener diode in LTspice. Consider the following schematic simulate this circuit – Schematic created using CircuitLab I'm interested in simulating its ...
1
vote
1answer
20 views

Why is there no variation caused by this swept parameter?

I quite like Qucs now that I more or less have the hang of it. Unfortunately, I can't figure out how to get a parametric sweep working. I'm running an AC simulation on this circuit: For now I'm not ...
0
votes
0answers
86 views

CircuitLab Simulation issues with an Audio Power Amplifier

I'm trying to simulate and eventually build a Blomley amplifier described here and here. When I simulate it as it is in Wireless World, it seems to work okay and my measurements make sense. But when ...
0
votes
1answer
52 views

Cannot simulate my model on LTSpice

I'm having trouble trying to simulate my NMOS (FDG6301N) on LTSpice. I have a permanent error telling me ...
1
vote
2answers
79 views

Input Impedance of Noninverting Amplifier

I simulated a simple noninverting amplifier using an operational amplifier in LTspice and i was wondering about the input impedance. The input impedance of a noninverting amplifier should be the ...
0
votes
1answer
75 views

LTSpice y-axis swap

When plotting values of 2 different types (in my case voltage vs time and current vs time), is it possible to swap the y axes to the opposite side? At the moment my circuit plot shows voltage on the ...
0
votes
1answer
157 views

PID Design & Simulation

I am designing a PID regulator but experience difficulties in simulation. My design is: I have chosen the value of the elements for: Ki = 12ms, Kp = 5, Kd = 1.5ms Here is the result I get: What am ...
1
vote
1answer
57 views

How determinate parameters for thermal-model battery (Advanced question about battery modelling)

I'm trying to simulate an electrical model based on Ceraolo battery model for lead-acid battery. The challenge in this model is to determine the parameters that describe it. I can understand and ...
1
vote
1answer
49 views

How to simulate a FIFO in Logisim

I'm looking at prototyping a design I plan to build using logisim. The design will make use of a FIFO IC (74HC40105) as a buffer between a data producer process and a data consumer process. I can't ...
0
votes
1answer
24 views

AWR PA Output Power Simulation - Credible?

I'm working with the SKY65111-348LF power amplifier from Skyworks and wanted to obtain some idea of its performance using AWR Microwave Office. I'm not sure if my process is correct and wanted to have ...
1
vote
1answer
127 views

Simulation of a class E power oscillator using LTspice

My goal is to understand and design a class E power oscillator. To this end, I am trying simulate the following schematic using LTSpice. Circuit topology and the design values are extracted from the ...
0
votes
1answer
40 views

PSPICE simulation

I have a PSPICE file that contains approximately 200+ transistors. Naturally, simulating the whole circuit everytime I make a change takes a while. Is there anyway to run a simulation measuring only ...