# Tagged Questions

About tools to simulate circuits. Specify the tool used.

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### register with enable signal, problem of understanding simulation results

I simulated a 32-bit register with an enable input in Vivado. The following things are unclear to me: I don't understand why 0xFFFFFFFF is latched at 5 ns and not the previous value 0x0abcdeff. ...
31 views

### Voltage follower with LF411 shows -6dB instead of 0dB

I designed the circuit shown in the first picture. It is a voltage follower realised with a LF411, connected to its output is a load of 10k and an AC source on its input with an amplitude 0.5V. I am ...
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### How to test digital HPF in verilog [on hold]

I have an HPF generated from MATLAB Into a verilog code. I would like to test it by simulation. How can i do it?
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### Theoretically simulating photo-voltaic solar panels using math/code

I'd like to simulate the behavior of PV solar panels and model how various parameters affect their performance. For example the effects of irradiance, temperature, and series and shunt resistors. I ...
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### What is a “reference conductor”?

I am working with a twisted cable model. Therefore I have: 2 input pins 2 output pins But I also have a fifth input/output call "reference conductor". Based on the notation, it seems to be an ...
33 views

### LTspice giving incorrect voltage value for simple first order low pass RC filter

I drew this low pass filter circuit to have a output voltage of 5v across capacitor at a frequency of 100Hz sine wave of amplitude 10v. But I am only getting 4.5 volt as output in steady state. I am ...
22 views

### Does the absolute sum of the elements of the imaginary part of the Y-matrix correspond to anything?

I have a simulation of a device with 4 ports (a double gated organic field-effect transistor), about which I also have some experimental data. I also made a simulation where I extracted the impedance ...
25 views

### PSpice Simulation of CE8301

I have been working on a project that requires me to boost 1V to 5V. I have found a ready-to-use boost regulator that gets the job done. The problem is that I need to get the circuit simulated on ...
157 views

### Understand mosfet conductance simulation?

I made a simple simulation of following circuit (in LTSpice): The IRFZ44N mosfet (10v on gate voltage) is switched on and off with 1kHZ 12V 50% duty cycle PWM signal. The "Heavy-load" is just a ...
49 views

### How to identify semiconductor parameters for spice model?

I am simulating circuit which uses NPN IRFZ44N power MOSFET and MBR1560CT rectifier (used in the circuit just as a shottky diode, connecting 2 out of its 3 legs only). Here is a circuit made in ...
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### Quartus 2 double increase frequency

How can I create a up/down counter using quartus 2, that allows frequency to increase each time when you press and hold a button for 5s on the board
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### Stamp Errors in layout

I am working on layout. I have two power supplies. For this when I took a via from Metal1 to n well I got no issues. But when i consider another via from Metal1 to n well, I am getting the following ...
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### Estimate realistic parameters of transformer for educational simulation of DC/DC converter

I am trying to simulate a full bridge DC/DC converter with SimPowerSystems for educational purposes using the datasheet of a specific converter as example. For the simulation I need the following ...
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### LTSpice constraints on plots

A have a circuit for which I have parameterized some of its resistors with the .STEP command. Consequently, I have many different graphs when I simulate the circuit. I would like to know if it was ...
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I am trying to simulate a testbench on ModelSim, but when I run the simulation, it never advances in time. The delta does not increase, either. Are there any useful tips for debugging in a situation ...
27 views

### How to model constant voltage across fuel cell in a process model

I am creating a process model of a fuel cell using the finite element method. I'm having trouble modeling the electrical component of my system - and I was wondering if any electrical engineers here ...
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### What the FPGA dev board to choose: Xilinx or Altera? [closed]

I'm very new to programmable logic world and have never worked with any HDL languages, but I certainly want to get started with FPGA. At the moment the goal is to develop/simulate simple 8bit CPU and ...
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### What is the syntax for modelling a non-linear element in Spice?

Suppose I have the following circuit. My question is how do I write the net-list in LTSpice such that f(i) = i^2 + 2 (for example) ? I couldn't find the syntax on the internet.
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### PartSim - Not possible to view full waveform range

I would never normally ask something like this on here but have been struggling for a while. I'm not sure if i'm missing something obvious but I have the circuit below. When the wire is disconnected ...
42 views

### Representing an equation with a simulation of Operation amplifier adder

I am trying to represent an equation (Vf=-3V1+7V2+2) using operation amplifiers. The schematic that I did is: simulate this circuit – Schematic created using CircuitLab but I have ...
22 views

### How to Simulate 10w LED packages in Circuit Lab

I've been messing around buying random electrical components from China and I came across these 10w LEDs and, after seeing how bright just one was when supplied with 12v at 900mA, now I'm looking for ...
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### How to infer equivalent PID controller coefficients from an existing black box ccontroller?

I have a 2 input, 2 output system that I have recorded in response to 1. steps (actually quasi-steps, with 50 ms rise time + some overshoot), and 2. sine waves from 0.5 to 50 Hz, in both open and ...
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### Audio Amplifier Design (CE Amplifier - Class AB Power Amplifier)

I am trying to design a Audio Amplifier which provides a gain of 20db (10V/V). I have managed to design the following circuit but the output voltage gets clipped and clamped. Please find the schematic ...
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### CE Amplifier Design for Audio Amplifier

I am trying to design an audio amplifier which provides a maximum gain of 20dB (or) 10V/V . For the circuit I designed the lower half of the amplified signal is being clipped. I am also attaching the ...
54 views

### Why Can't I get a Smooth Sine Curve in PSPICE

I am trying to simulate a Volume Control Circuit in PSPice Student Edition. I am unable to see a smooth sine curve at the output. Could you check my circuit. Find the Schematic below Thanks
50 views

### Why this concept in VHDL doesn't work?

I want to make a simple processing element for calculating the absolute difference between two 8-bit words. However, this element may be used as part of an array in order to speed up the AD ...
35 views

### Showing negative numbers in Verilog

I am writing a program for a 16-bit ripple carry adder and stumbling a little at the end. When I run my code (which includes negative numbers), it's doing the math right, but giving me all positive ...
19 views

### circuit/multisim troubleshooting

I can't seem to get an output wave to appear. Can anyone see anything wrong? Or are my values off, like the capacitors?
52 views

### How to simulate a n-p-n bjt using Cadence Virtuoso?

I had been simulating CMOS transistors using Virtuoso, in which I had used ami06n as model and NCSUanalogParts as library. But for a BJT, when i tried simulating through ADE-L using this config, it ...
51 views

### Simulating a Constant Temperature Anemometer

I am trying to simulate the results I see when using a constant temperature anemometer circuit to sense air flow. An excellent discussion can be found: arduino thermal anemometer. Here is my ...
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### Disambiguation of AC Analysis and Small Signal Analysis

I am trying to understand Small Signal Analysis (SSA) for Diodes and BJT transistors through different textbooks but I have some issues. Is AC Analysis the same as SSA? I have seen hints that imply ...
29 views

### How is MOSFET modelled in DC analysis?

I am wondering how simulator (LTspice, Cadence,...) compute DC operating point of MOSFET in DC analysis. I know that in DC analysis, capacitors are open and inductors are short. With MOSFET how is it ...
33 views

### Error in 'Multisim' when connecting two op amps in cascade

I've connected the circuit below (wien bridge oscillator) and simulated it using Multisim: The results were expected: a sinusoidal wave of 1.2 Vp-p. I wanted to amplify this resulting signal, so I ...
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### Half Wave Voltage Doubler Simulation stuck

I'm trying to simulate the following circuit on LTSpice simulate this circuit – Schematic created using CircuitLab The capacitors have 10Meg Parallel ...
58 views

### LTspice IV ir2110 H-bridge simulation wierd behaviour

I want to simulate H-bridge using LTspice. At some point Ho stops working correctly. I am using ir2110 typical connection as schematic. This si up to the point where is it working ( but schematic not ...
21 views

### display the output of a MATLAB simulation model for an induction machine in space phasor illustration

Hello, do any one know, if is it possible to display the output of a simulation model in MATLAB with the space phasor illustration? (in german: Raumzeigerdarstellung) as the picture shows: I have ...
82 views

### Input/output impedance of microcontroller

how to calculate the input and out put impedance for a micro controller , for the purpose of modeling in LT spice , for example RX610 family from Renesas For example the lumped characteristics can ...
245 views

### AD620 in Proteus: timestep too small

I've made this circuit in Proteus, as a part of a practice report: In real life it works, as I built and tested it. But in Proteus, when I want to run the simulation, I get these errors: ...
51 views

### simulating a electrical transformer

My goal is to program a FDM simulation of a transformer. So, we have the coupled inductor model to start with ... However, if L1 = 1, L2 = 9, and coupling is perfect then M = sqrt(1*9) = 3 and L1 - ...
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### Event Debug Mode error when performing mixed Verilog/VHDL simulation in VCS

I am getting the following error: ...
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### Two different ways of writing the same thing but generating different behaviours in Verilog

I have a part of Verilog code that is basically trying to synthesize a flip-flop. I have been experimenting and it seems that I can come up with two ways of writing it. The first way being : ...
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Recently I bought an anemometer from Adafruit. I was wondering is there is any way or approach which I can simulate the sensor for measuring the wind speed. If there is any software able to simulate ...
42 views

I want to link an IGBT .mod file to the model provided by the breakout.lib (ZbreakN) of Orcad Capture. I added the component of the breakout library, right-clicked, 'Edit Pspice model' and then pasted ...
78 views

### How to debug FPGA designs

This is supposed to be a followup to my previous question how to get a FPGA design that will definitely work on actual hardware. I have made a lot of progress since I asked the above question (thanks ...
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### What are common EE computer tasks? [closed]

I am an electrical engineering student looking to build a desktop computer. That being said, I would like to configure it to run common EE tasks as efficiently as possible. Therefore, I am trying to ...
40 views

### Find cutoff frequency of a common emmitter amplifier

simulate this circuit – Schematic created using CircuitLab I need to find the cutoff frequency of this common emmitter amplifier. Is it possible to simulate a bode plot?
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### Spice mosfet, user selectable parameters ires, cox, pox, vtn from a 3rd party model

I have a spice model for the part ald1103 from advanced linear devices that contains parameters to be filled in by the user, presumably to support custom ASICs using transistors from this ...