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BCD Up-Counter Schematic Error

When I try to simulate my schematic for my up counter, i get the error Net "Net-name" cannot be connected both to an input port and an instance output pin. Here is my schematic I am pretty sure ...
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14 views

Cadence SoC encounter

I am trying to create the layout of my design for an 8 bit multiplier accumulator in SoC Cadence encounter tool. After routing the design using wroute command, the ...
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19 views

How to create Spice / LTSpice repeatable damped sinusoid

Is there a more elegant and/or simpler method to model a repeating, damped sinusoid from SPICE or LTSpice rather than chaining the damped SINE sources in series? Below is a schematic and the ...
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1answer
21 views

Can you interface a Modelsim testbench with an external stimuli

I am working on a team that is doing both driver software and FPGA development. The FPGA simulation is being done in Modelsim and driver software is written in C. To minimize integration risk, I ...
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2answers
34 views

How to simulate Wi-fi signal strength indoor environment?

I want to simulate Wi-fi signal strengths received by a mobile moving around in X m3 that contains N access points. I must take into account the effect of walls and if possible the effect of moving ...
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1answer
28 views

Does NI Multisim simulates op-amp input and output noise?

I just created a circuit with AD620 in-amp and I'm worried that there is not enough noise. I wonder if Multisim simulates advanced op-amp/in-amp properties, like input noise and such? I mean, if I ...
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54 views

Wien bridge oscillator LTSPICE

im looking for a good oscillator to implement in a circuit and I was trying to simulate a Wien Bridge oscillator in LTSPICE but I have no success as my output is always 0 V. Is there a special ...
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1answer
38 views

Is there any online or free to download (for Windows 7) AVR simulators? [closed]

I'm currently using CodeVision AVR to write a code. Let's say I have a compiled HEX file and I'd like to try it running on a virtual processor (ATtiny861A). Google gives me some results but I'd ...
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44 views

Modelling Hot-Plug event

In a related question I described unexpected (smulation) behaviour of a P-Ch. MOSFET high-side load switch when input voltage rises very steeply. Now, admittedly a step input can't quite be a good ...
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28 views

How can I create a new component using Qucs?

I'm using Qucs for a simulation, but I don't understand how can I create a new component (E.g. a new LED from a data sheet). How can create it and use it easily in my project?
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3answers
70 views

Voltage dip on MOSFET switchable current shunt

I have the following circuit built up in LTSpice which will be used to switch in different sense resistors for current measurements. The mAEn signal switches the M1 transistor on at t=10ms which ...
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1answer
24 views

How do I compare waveforms from multiple simulations in QuestaSim/ModelSim

I want to compare the waveform result from different tets. So basically the test stimulus changes but the unit under test is the same in all cases. What steps do I need to follow to do this? ...
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24 views

Parametric sweep batch mode in Gnucap

When doing simulations in Gnucap, batch mode, how can I do a parametric sweep? The sweep command works in interactive mode, but when done in batch mode with ...
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1answer
62 views

Pseudo-Nmos inverter in LTSPICE

In LTSPICE, I've built a pseudo-NMOS inverter and I've got 2 tasks to do using it. 1) I've a initial guess for Wn value of NMOS. I start the simulation with this value however, I need to optimize it ...
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3answers
66 views

How to optimise something when multiple parameters change the output

This dilemma seems to occurs all the time in so many different engineering problems. It seems impossible to optimise something with multiple parameters, for three reasons: There are too many ...
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1answer
48 views

How to fit MAX941 macromodel to LTSpice “opamp2”?

I am new to adding models to LTSpice. I have successfully added OPA350 from TI, but with MAX941 from Maxim Integrated I get some errors due to the LTSpice "opamp2" model does not have the same amount ...
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1answer
61 views

How can I model a variable current sink in spice?

For a project I am working on (related question here) I need to model a nonideal variable current sink in spice. Simply reversing the orientation of a current source or inverting its value is not ...
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2answers
59 views

ATtiny85 simulation in AtmelStudio 6.1 (build 2730, SP2)

I have written a piece of code which manipulates the DDR for port B: ...
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1answer
66 views

sequential circuit chaser light

I am trying to implement a sequential circuit in logisim that has LED chaser lights (http://www.youtube.com/watch?v=Mo8Qls0HnWo) like on this car. I have tried using D flip flops with a clock and ...
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55 views

Relation between delta cycle and event scheduling in verilog simulation?

I understand that in Verilog/SystemVerilog standards there are different regions for event scheduling, thus mimicking the behavior of concurrent hardware. But how does this relate to the delta cycles ...
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2answers
102 views

Three-phase rectifier circuit simulation

Is this the correct way to simulate a three-phase full bridge (6 pulses) rectifier? I ask because I have tried this first without the two capacitors, just one, and the capacitor seems to have ...
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73 views

Difficulties with Representation of Half Wave and Full Wave Rectifiers on PartSim

After tweaking the domains, the run-time duration of the simulation and the location of the probe I discovered that there was no mistake. Below I've attached a picture of the graph blown-up. ...
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2answers
156 views

Why wont my opamp gain properly? (schematic attached)

I am trying to take a input signal which will shift between 1-5Hz and amplify only the AC portion of the signal (0.02V pk-pk, ~3 volt offset). The whole circuit has to run on 3.3v single supply DC. I ...
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2answers
109 views

Trouble simulating Colpitts in Multisim

I've been trying to get a Colpitts oscillator to work with multisim, following this schematic, which I found in a book (I just copied it): Yet, it does not work, all I get is a 0 voltage signal ...
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141 views

how to find the value of a capacitor/varactor in cadence virtuoso

I've been given a MOS varactor model and layout to use in a project, and I need to be able to plot the capacitance as the applied voltage is swept. I don't know how to do this in Cadence and ...
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1answer
36 views

How to get values of voltage and current at different times ,using pspice?

This is probably a really trivial question nevertheless it has had me confused for a while. I'm trying to solve a circuit using PSpice and for that matter I need to get the values of different node ...
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30 views

Where can I find synchronous machine parameters to use in a PSCAD simulation?

I am trying to observe a loss of field on synchronous motors of different types and sizes. PSCAD seems to want a DQ equivalent circuit. I've Googled the problem and tried several manufacturers' ...
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62 views

Are some implementations of SPICE more accurate than others?

Just like the title says. Is there one single SPICE back-end that's the same for different versions of SPICE, or are the different versions performing different simulations?
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98 views

Biological 'Black Box' - how to test for underlying logic?

Firstly, I am a neuroscientist - so bear with me! I have a collection of connected brain cells (network) and a means of recording the electrical output, as well as manipulating the input to the ...
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2answers
167 views

Problem with Wien's Bridge basic working and simulation in multisim

I am very new to the concept of Wien's bridge and am trying to make a basic circuit of it but didnt get the expected output (noise only).Tried to simulate on Multisim but got the same output.I have ...
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71 views

NgSPICE Too Few Parameters Error

I have been trying to simulate a flash ADC in NGSPICE using the gEDA package. I had used the 74148 8 to 3 encoder and the UA741 OpAmp in the model. I had also included the requisite spice model files. ...
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1answer
100 views

Digital simulation display

I am new in the field of electronic circuit simulation and the two articles i am reading from http://en.wikipedia.org/wiki/Electronic_circuit_simulation http://en.wikipedia.org/wiki/SPICE have ...
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2answers
166 views

Getting started with electronics - virtual breadboards with IC's? [closed]

I was looking to start getting into electronics beyond just some basic soldering and closed circuits. I've never worked with IC's before. So, a project that I wanted to try out was a LED chaser ...
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85 views

Linux Circuit Software To Calculate Power Dissipation

I am a bit new to this whole circuit simulation software, so I was hoping someone could share their years of experience with me to help me weed through this seeming jungle of software-packages. I ...
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1answer
335 views

Simulating a Flyback converter using Matlab / Simpowersystems, cannot get it to work, any tips?

I have created a flyback converter model using Simpowersystems in Simulink/Matlab. But it always gives me the wrong answer! I have simulated the same system using PLECS and Simscape/simulink and got ...
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170 views

Problem with PSPICE simulation

PSPICE shows the following errors when an attempt is madeto simulate a circuit PSPICE version is 16.6. Running on a Windows 8 OS PSPICE A/D lite opens with the error ERROR:Unknown data file format ...
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306 views

VGA Decoding - Dealing with tolerances

Update: The VGA Simulator is up and running. You can go simulate your own designs or just use the example file to see it working. I also wrote a blog post to help anyone get started using it for ...
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218 views

Measure capacitance in softwire using Tina/Multisim/other simulators

Is there a way to measure capacitance of a capacitive network as shown below in Tina-TI, Multisim, or other simulators? I tried searching but I couldn't find any way to measure capacitance directly as ...
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52 views

Simulation of tuned circuit with initial inductor current gives flat zero

I'm playing with ngspice, and wondered if I could get a signal out of a simple RLC circuit using an inductor with initial current. There are no power or current sources. The results aren't what I ...
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136 views

How to debug a circuit that uses Charlieplexing and PWM with LEDs under ISIS?

Using mikroC and Proteus ISIS, I have built a circuit that uses a PIC12F629 (link to datasheet PDF). It controls several LEDs using Charlieplexing technique (and additionally PWM them to change their ...
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80 views

Find resonance, bandwidth, etc.. from Bode Plot

I am analyzing the following circuit simulation in pspice: I need to find the resonance and cutoff frequencies, bandwidth and the quality factor from the simulation. I know how to do it by hand ...
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2answers
147 views

Simulation of large RAM

I want to test a video IP core that reads a block of memory and writes to it again. The IP core is using the VFBC. My idea for testing was to write a core that looks like the VFBC, but just uses a ...
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87 views

PSPICE errors when capacitors are 0Farads

I'm getting a value may not be zero error wheneever I try to simulate a circuit containing capacitors whose values are zero.
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50 views

Controlled sources in Tina-TI

I am using Tina 9 to verify whether my answers in mesh analysis and nodal analysis are correct. Just started using it, and I have some queries about controlled sources. On simulating control sources, ...
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197 views

I2C function for PIC

I wrapped a function for I2C initialization on PIC18F26J50 and it happens to be somewhat like this: ...
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465 views

LTSpice, MAC97A8 TRIAC model, Vgs error

I'm having some difficulty getting LTSpice to like a TRIAC model. The specific error it throws is "Missing model definition for VGT-0.65". The trouble is that VGT is a subcircuit parameter, not a ...
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170 views

Why am I getting this error when placing a capacitor in Proteus?

I have a circuit in Proteus with a few logic components (logic gates, counters, comparators, adders, etc). I have a 3 input AND gate which two of the inputs are '0' and the other one is a Clock ...
2
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1answer
211 views

VHDL: when is process sensitivity list triggered?

In VHDL simulation, there is a concept of "delta time," which is loosely interpreted as "group of events triggered by the previous delta time." After a change, once all cascading changes have settled, ...
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1answer
148 views

Low Pass Sallen-Key filter has weird response in bode plot

I have the following circuit in Multisim and am getting the Bode plot at the bottom. Could someone please explain to me what is happening? The AD8651 is listed as having a 50MHz bandwidth. Why is it ...
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95 views

QuestaSim/ModelSim simulation gives me unkown value in wave window. However I get them as X and x, what is the difference between the two?

What is the difference between big X and small x when we get red (unknown) signals in QuestaSim? I would assume it to be the same in ModelSim simulation as well.