About tools to simulate circuits. Specify the tool used.
2
votes
1answer
212 views
Circuit Nodal Voltage
I have a voltage divider feeding into an op-amp voltage follower buffer circuit. I'm trying to calculate the voltage level at the non-inverting input of the op-amp vs. the source voltage. The possible ...
6
votes
2answers
143 views
Is there any VHDL 93 or 2002 code that is incompatible with VHDL 2008?
Is there any VHDL 93 or 2002 code that is incompatible with VHDL 2008?
In other words, if I have a bunch of files made for older vhdl standards, will a 2008 simulation/compilation work just fine?
...
4
votes
2answers
436 views
PSpice generates gray hair, not correct answers
I have an extremely simple circuit that involves a NMOS, three resistors, and a voltage source. The circuit and info are shown below. Please understand that I could probably analyze this circuit while ...
0
votes
1answer
265 views
graphical circuit simulator like logisim
I wanted to make a CPU and then somehow measure its efficiency/ speed. Logisim is a little buggy, and I don't think it allows you to do any sort of testing/ measurement. Does a tool like this exist?
3
votes
1answer
134 views
FPGA “physical view” visualiser with Verilog simulation
I find the 'Physical View' provided with most FPGA tools somewhat memorising for a complex design. Tens of thousands of switchboxes, LUTs, latches and multiplexers all configured mysteriously from the ...
7
votes
4answers
505 views
Modular Analog Circuit formula solver?
I've been thinking of making a database / program to make building analog circuits easier. I wanted to make sure there isn't anything else like this that I can contribute to instead of going through ...
1
vote
1answer
209 views
Looking for an easy to use circuit design software similar for beginner
I'm teaching my son digital circuit design. I am looking for an easy to use design tool that can serve to sketch out the circuit and simulate it before we go and blow chips and money. The ideal ...
4
votes
1answer
297 views
Discrepancy between post-Place-and-Route static timing analysis and ISIM simulation results
Overview
I'm implementing a simple Harvard-style CPU using Xilinx ISE version 14.1. I'm using settings compatible with a Digilent Nexys3 board, but for the time being the entire project is performed ...
7
votes
3answers
313 views
About SPICE: Should I use transient analysis or DC linear analysis?
My question is specifically linked to an exam problem where I had to find a function in terms of time for the current on a capacitor and a resistor. The circuit was very simple: A current time-variant ...
0
votes
1answer
365 views
Error when simulating spice model in OrCAD PSpice
I am trying to simulate a circuit based on TS522 op-amp using OrCAD PSpice 16.5. The manufacturer's website did not have a model for this op-amp, and I had to look for it elsewhere. I was able to find ...
1
vote
0answers
214 views
Is it possible to add several plots to the same PSpice simulation?
I'm using OrCAD Capture/PSpice 16.3 to simulate a MOSFET circuit. One of the difficulties I'm facing is plotting a timing diagram of several voltages. If I simulate the project and choose which ...
1
vote
1answer
180 views
Simulation problem in pSpice 9.10
I just started to use PSpice. I created a rectifier in PSpice 9.10, but somewhere I'm making a mistake and I don't know where.
The output:
1
vote
0answers
206 views
Modeling Power MOSFET with Matlab
I decided to give SimPowerSystems in Matlab a try. My problem is that I find the notation quite confusing, it seems rather different from the one usually found in data sheets. Take for instance this ...
0
votes
0answers
233 views
Bandpass filter [closed]
I have drawn a bandpass filter for 833Hz and use microsim simulation to test my circuit. Does anyone know why sending in a sine wave results in a triangle wave as output? When i test it on my 50Hz ...
0
votes
0answers
106 views
How can I simulate an FST3126 4x bus using Multisim
I'm trying to simulate a circuit in Multisim that contains an FST3126 4x bus switch. Here's a link to the Data sheet and I copied a portion of the logic diagram below for reference. Anyway Multisim ...
1
vote
1answer
243 views
Command line simulation using pspice
I'd like to use OrCAD Pspice's "psp_cmd" to do three simulations using only one .cir file.
The problem is that execution of
psp_cmd mycircuit.cir
creates only ...
0
votes
1answer
933 views
ADC Stimulus file with MPLAB SIM (Simulation with MPLAB SIM)
I'm trying to simulate my project using MPLAB SIM but I get the following message:
ADC-W0008: No stimulus file attached to ADRESL for A/D.
How do I create an ADC Stimulus file?
Info that might ...
2
votes
1answer
360 views
Losses in NE555 oscillator and Sallen-Key filter
I use a Sallen-Key bandpass filter in a project at university to isolate the 1kHz sinusoidal part of a square signal produced by a NE555 oscillator.
Here is my circuit:
When I simulate it on PSpice, ...
5
votes
2answers
377 views
transfer function of a full bridge diode rectifier
I'd like to find the s-domain transfer function of a full bridge diode rectifier with capacitive output filter. Surprisingly, there doesn't seem to be much literature on this.
Analytically, I am ...
2
votes
0answers
96 views
Gnucap: using Vsupply command in batch mode
I am simulating a circuit with Gnucap, and I'm automating several steps in a Makefile:
...
4
votes
3answers
313 views
Help wanted explaining signals coming with higher frequency than clock and how to handle them
I am getting my hands on Verilog and FPGA programming. So I wrote a simple module that handles two inputs - button signal and a clock. Initially, it lights up two LEDs and when the user presses and ...
0
votes
1answer
101 views
Setting +9V behaviour in GnuCap
I am trying to simulate a monostable multivibrator in GnuCap. I have the following simple netlist (with arbitrary, probably non-functional component values but that's not the issue):
...
5
votes
2answers
601 views
What PCB electromagnetic simulation tools are available?
I would like to perform electromagnetic simulation and analysis of simple PCBs (coupling, capacitance, impedance, EMI, etc.)
Are there any reasonably priced (sub £1000), or free packages available ...
3
votes
1answer
317 views
Generating thermal noise from a resistor
I'd like to create a random number generator based on thermal noise from a resistor, using an opamp to amplify the noise and an inverter to convert the resulting spikes into a digital signal.
Here's ...
2
votes
1answer
76 views
source of errors in simulation [closed]
Other than operator errors, machine errors, and rounding, what might cause standard circuit simulators to produce bad results? In other words, are there known circuits for which simulation is "risky"?
...
3
votes
2answers
223 views
Too slow falling edge
I constructed this circuit in the simulator Multisim11. It should switch current 15A trough resistor R1 for PWM regulation. I need to make it work for frequency 2kHz. The function generator XFG1 on ...
2
votes
2answers
63 views
Is every in-field stimulus replay-able during simulation?
I always though that simulation of hardware architectures (FPGA/ASIC) cannot cover every possible stimulus and corner-case that can be encountered in real conditions, and that hardware-accelerated ...
3
votes
5answers
512 views
Wrong outputs in VHDL entity
I have lessons about VHDL in one of my university class and I have to write simple entity which will generate clock from 1MHz source. I'm using CoolRunner-II CPLD ...
11
votes
1answer
375 views
Mathematical models for vacuum tubes?
Are there any commonly accepted algebraic models for vacuum tube operation (triode, tetrode, and pentode)? In the same way that BJTs have a Gummel-Poon or Ebers-Moll model, and (macroscale) MOSFETs ...
0
votes
0answers
382 views
Can SPICE simulate inductive device flyback effects?
Following up my earlier question, can SPICE simulate inductive device flyback effects? I would expect so, because this would seem to be a critical part of simulating a switching power supply design. ...
5
votes
3answers
355 views
Distribution of component values with a given tolerance?
Suppose I have a collection of parts with the same nominal value and some tolerance, say 50 Ohm 1% tolerance resistors. What distribution of actual component values can I expect? I can imagine ...
1
vote
2answers
1k views
Debug an Arduino project on AVR Studio 5 Simulator
I'd like to debug my Arduino Atmega 2560 project on the AVR Studio 5 Simulator.
The thing is, as I understand it, Arduino code doesn't run on the Atmega chip by itself, it uses a bootloader - In my ...
0
votes
1answer
364 views
How can I simulate x6500 or x6000 FPGAs?
For some odd reason, Altera does not have anymore cyclone II education kits here. I was planning to use them for bitcoin mining or some other number crunching. Then I found x6500 and x6000 FPGAs but ...
4
votes
2answers
1k views
Simulation of parallel port but without a parallel port
I've been working on a project in my faculty that requires me to use a parallel port, but as I see my laptop doesn't have one!
I've been searching for a way to simulate the parallel port on my ...
13
votes
9answers
5k views
Free circuit simulator for educational purposes
I am looking for a free circuit simulator for educational purposes. My requirements are:
Visual ("draw a circuit diagram, click simulate")
It should contain light bulbs as circuit components such ...
1
vote
3answers
556 views
which is the best circuit simulator for my purpose?
hi all i want to know the the limit of my circuit,upto which it can withstand,so that i can select or change the components accordingly.When i tried simulation in NI MltiSIM, it works fine,but the ...
3
votes
1answer
176 views
How do I determine the electrical characteristics of a cheap kit motor?
I have a kit that includes several cheap 3V electric motors of the free-spinning variety (e.g. not servos or steppers).
I would like to design a simple controller circuit to replace the contact ...
2
votes
1answer
768 views
Zero Crossing Optoisolator in Multisim
I'm an electronics hobbist with relatively little experience and I'm playing around with Multisim to try to understand how to manipulate AC waveforms. Specifically, I would like to control the wave ...
2
votes
4answers
595 views
How do I make a real-world verison of this LC circuit?
I'm trying to build the LC oscillator show on the bottom of this page for some school project and I'm having a bit of problems translating the theoretical circuit into a real-world one.
Here's the ...
2
votes
2answers
1k views
Op Amp based Hartley oscillator
I would like to build an oscillator that will satisfy a few requirements. The main requirement is to have exactly one capacitor. Another one is to have high Q and sine wave output.
I am considering ...
2
votes
1answer
296 views
Transfer Function of Non-Ideal Transformer
What is the mathematical relationship between primary and secondary windings?
It can be either in the s-domain, or a time domain expression.
This expression must contain all realistic parameters, ...
2
votes
1answer
788 views
Simulating noise signals in Multisim
I would like to simulate the effect of noise in a circuit built in Multisim so that I can make better component choices to improve my design. The main source of concern for me is that the circuit will ...
2
votes
3answers
1k views
Spice Simulation Models?
Where can one go to find SPICE models? I am curious if there is a giant repository out there somewhere that I can search?
In particular, I am looking for a model for an LM317 voltage regulator, at ...
4
votes
1answer
1k views
LTSpice Automation
I have a battery-powered boost converter and I'm attempting to measure the maximum input (battery) voltage droop under various load conditions of high current draws (different ...
1
vote
1answer
104 views
What's the difference between DSUB25F and DSUB25M?
I want to simulate printer port in multisim.
But I found that printer port(25 pin) also have two choices,such as DSUB25F and DSUB25M.
What's the difference between them? I couldn't find anything in ...
1
vote
1answer
159 views
What is the software used in this image(semiconductor simulation)?
If I interpret this correctly, this means there is some nice software to simulate various properties of semiconductors. Does anyone know what it is or alternatively what packages do the same thing?
...
0
votes
1answer
411 views
LTspice: when I turn a schematic into a subcircuit it behaves differently. Why?
I'm trying to model a low frequency LED flasher based on a BEAM Pummer (basically a pair of CMOS inverters wired as an oscillator, plus a charge pump) in LTspice. I have the base flasher circuit ...
1
vote
1answer
163 views
Is it possible to simulate ISP loader?
If I want to make ISP loader for 89Sxxxx(8051),can I simulate it by multisim or others before I really build it?
I follow this link:
http://m955.com/wp/archives/142
I found it has a little hard to ...
1
vote
1answer
178 views
Serializing 4 channels to 1
Please follow the paper in this link.
I have a 10Gbps NRZ signal generated which is to be fed into a 4:1 MUX. The system contains three components: The serial link chip consists of three individual ...
6
votes
1answer
348 views
Is there a solution for converting printed schematics to spice netlists?
I would like to be able to scan circuit diagrams into a circuit simulator. While I am aware that symbols are not entirely standardized, is there any software that will do an approximation of this?
