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Questions tagged [simulation]

About tools to simulate circuits. Specify the tool used.

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How can I simulate uc3854 based circuit

I want to design pfc boost converter using uc3854 but I am not getting its simulation model also on texas TINA ti library. Where can I simulate it?
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30 views

Voltage multipliers work worse with more stages?

I'm simulating voltage multipliers (Dickson topology) with the stages from 1 to 12, following the paper "Design Optimization and Implementation for RF Energy Harvesting Circuits, 2012". The load was ...
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SPICE BJT simulation results

I'm trying to simulate simple BJT circuits to verify my hand calculations. Following is my circuit, I'm just trying to get the calculated DC collector current with the shown voltages and parameters. ...
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Correctly Using the Chan model in LTSpice

I am trying to use the Chan model to better simulate a transformer in my design. When I am making an equivalent transformer circuit, where does the Chan inductor go? On the LTWiki it is implied ...
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1answer
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LTSpice: How to start the step of a voltage source at a different time in the transient simulation than t=0s?

If I have a complex circuit where things occur at different times instead of starting as soon as the simulation starts (t=0s), how do I setup those things to occur at different times in the simulation....
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3answers
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LTSpice: How to offset the start time in a transient simulation?

I see how to set the total run time for a transient simulation, but what if I didn't want the simulation to start at 0s? For example, if I have two voltages sources that are stepping at offset times ...
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LTSpice: When running a linear AC simulation, how to view the voltage ratio between two voltages?

For example, how would I see the ratio between Vi and Vo for a linear AC simulation?
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1answer
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ngspice error: too many nodes connected to instance

I'm getting the following error from ngspice: too many nodes connected to instance The netlist and circuit I'm modeling are shown below. Each bulk is tied to the ...
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1answer
31 views

Proteus simulation problem (beginner) - “Power rails 'VCC/VDD' and 'GND' are interconnected in net GND” errors

I'm a beginner to microcontroller programming and the Proteus simulator. I'm following this "PIC MicroController Volume Adjuster Program(Proteus 8 Stimulation)" Instructables project. When I pressed ...
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Circuit simulator for a musical tesla coil?

I want to make a musical tesla coil. But I want to do some experimenting with the values of the voltage, turns ratio and the audio input. So I need a circuit simulator so that I can fixate on what ...
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spectre save command - usage

I did look at save command documentation in Spectre user and reference guide. But it still looks confusing to me. I am specifically looking for commands to do following two task: 1) probe all nodes ...
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How to simulate under skewed process corners (SF, FS, SFA, FSA) in Cadence 65nm?

I'm testing a circuit under different process corners and I already know how to simulate under FF, SS and TT process corners. However, I'm getting inconsistent results in the skewed corners (SF, FS, ...
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Performance issues when using CMOS SR Latch with 180nm transistor models in circuit simulator

I am trying to incorporate a CMOS SR latch made with 180nm Level +49 transistors into a larger circuit but am running into issues. I am hoping this community can point me in the right direction of ...
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1answer
69 views

How do I model a resistor array in SPICE?

I am currently building a library of SPICE simulation models that is going to include resistor arrays. These arrays exhibits both absolute tolerances and relative tolerances. Usually, the relative ...
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Problem with simulation of a n- mosfet in pspice

Im trying to make a simulation based an a DC sweep from this circuit But at the moment of simulation I receive this warning WARNING: [NET0093] No PSpiceTemplate for M4, ignoring And it does ...
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1answer
60 views

Creating a temperature-dependent solar cell in LTSpice (using varistors)

I'm currently working on my master thesis and therefore need to simulate a solar cell in LTSpice. I've already modeled and simulated some examples with constant values. But for a more accurate model, ...
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1answer
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Amplification of a Microphone with a LED Array and speaker: Grounds? [closed]

This is the circuit I'm trying to build: Circuit on falstad.com I feel like everything works in theory, but I'm having trouble implementing the grounds on the actual circuit. I do not know where to ...
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How to calculate or show in matlab/pspice the DC component from a circuit simulation?

Based on Pspice I'm simulating this RL full wave rectifier That gives the next voltage and current output at the showed probe point The idea is to extract the DC component of the current or voltage, ...
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1answer
63 views

[Last Update]Simulating an RLC circuit with the 1N3880 in ngpice did not show any results or graph

Im trying to do a transient response analysis with ngspice/gnucap and gspice UI of the next RLC circuit (corrected the source polarity), to find the damping effect in the system. That with the next ...
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2answers
70 views

NMOS current flowing equally in both directions in SPICE simulation

I am trying to characterize this nmos on Xyce simulator (and trying to change its present Vthreshold) and am first DC sweeping the gate and measuring the current through the nmos. I run into this ...
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55 views

Timing issues in netlist simualtion - SDF simulation of IP block

TOOLs and Tech: Questasim 10.5c-2 / Synopsys design_vision I-2013.12 / STM 65nm Hi I am running some timing simulations on my design and have some doubts and issues with the results. 1- My design is ...
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31 views

How do I use a current source for a pulsed voltage in LT Spice?

For an LT Spice simulation I was doing of a transformer, I would like to set the current to 3 amps for a power supply, but I'm not sure how to use a current source for that. I tried putting two ...
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1answer
37 views

Linear regulator operating point over input DC Sweep analysis

I'm sweeping the linear regulator input voltage on DC using Spice from 0V to maximum expected Vin. However, as the OTA that makes part of LDO is internally supplied by the output voltage, the ...
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Create a unique file name inside an entity instantiated multiple times

I have a design instantiating a component many times in different situations. I want to trace some internal behaviours it has using text file output. Here is a snippet example I use in a component ...
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Why does functional simulation generate Zs?

I have a very simple project, I share the files in this github repo If I run a functional simulation (Waveform.vwf in the repository) I get some 'Z' in the value of an internal register, see the ...
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1answer
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Can't type on Virtual Terminal Proteus

I've connected my SIM900a module with PC via a USB to TTL converter. I'm using Proteus Virtual Terminal for check the AT commands. The problem is I can't type anything on the Virtual Terminal. Copy ...
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1answer
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What to do when you don't find an electric component in Proteus?

I am looking for this component: KSC1815. It is a NPN Epitaxial Silicon Transistor The datasheet is here: http://www.futurlec.com/Transistors/C1815.shtml But when I try to pick that component in ...
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1answer
36 views

DC motor model issue

I use the following DC drive model: with the following parameters of the motor: Matlab variables for these parameters: ...
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1answer
27 views

Simulating absolute value circuit in TINA-TI

I am looking to build an absolute value circuit using a pair of op-amps, hopefully using a single supply and would like to simulate my design using TINA-TI. The ultimate aim is to measure the voltage ...
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Is there a simulation technology testing both VHDL code and ADC/DAC?

With HDL simulators like Modelsim, possible to check HDL codes (similar I2C/SPI). Some of analog ICs(similar OPAMP) have SPICE models. I'm not sure that SPICE models of SPI/I2C controlled ICs could be ...
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3answers
72 views

What tools can I use for parametric circuit analysis?

I have analog circuit designs that I want to analyze for accuracy, etc. according to the component variations based on tolerance, temperature, etc. To elaborate further, imagine there is a circuit ...
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0answers
54 views

Plot antenna radiation pattern in Matlab

I have the antenna radiation pattern exported from CST. The file is txt file format and contains the angles theta and phi and the directivity. First theta varies between 0 and 180° and phi is 0° and ...
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1answer
55 views

How to compare power requirements for different control design approaches?

I am trying to fairly compare different control design approaches. As an example, below I present two similar but different techniques which are: Control system with state feedback Control system ...
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1answer
36 views

Adding dependant sources in LtSpice (CDCS)

I have the following schematic of the circuit, I wanted to added I2 as a Current Dependant Current Source depending on current on in V1 as three times the value, or, I(I2) = 3I(V1) I have tried ...
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81 views

Simulating a 7-segment 4 digit display in Proteus using Atmega16

I have an issue about simulating a 7 segment display in Proteus. So basically, I am using an ATmega16 microcontroller along with a ULN2803 transistor array. I connect the 7 segments + decimal point ...
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1answer
49 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
38 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
88 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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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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28 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
111 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
39 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
73 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
86 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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1answer
31 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
34 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
65 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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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
31 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
79 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 ...