Tagged Questions

A famous textual circuit simulator with a number of graphic front-ends

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3
votes
1answer
49 views

Help With Simulating Common Collector Amplifier In PSPICE

I have included as much information as possible, so it should just be a matter of pointing out something simple (hopefully). I am trying to model a biasing circuit for a Common Collector BJT ...
0
votes
1answer
42 views

Diode peak reverse recovery current

I'm trying to calculate the peak reverse recovery current \$I_{RM(REC)}\$ of a diode from information given on a typical diode datasheet (really what I want is the transit time TT, but the only piece ...
0
votes
1answer
19 views

Add permanent component in LTSpice from asc and asy

I'm trying to add a new permanent component (ULN2803) to LTSpice, having asc and asy files. I have read some tutorials in the web but focused on .lib and .sub files. How can I add the component from ...
0
votes
1answer
30 views

HSPICE - Measuring a series of values in transient simulation

I'm doing a transient simulation in HSPICE with an input vector file of N values (N>100). I would like to get at each rising edge of the clock (i.e. timing of the shape kT, T period, k integer) a ...
0
votes
0answers
22 views

transient analysis in aim spice

How do I carry out the transient analysis of series RLC circuit using AIM Spice? I can't figure out what values should be given for step size and final time. Also, I was seeing some tutorials and ...
0
votes
1answer
36 views

Error: Model in Pspice is undefined

When I simulate the circuit below in Pspice, the output info says: model J2n5485 used by Q2N5485 is undefined. But I have defined the model in the code. I need to ...
0
votes
0answers
16 views

How is Waveform Compression used in LTSpice to determine Timestep?

The LTspice wiki says (and I believe this is basically copy pasted from the offical documentation): Syntax: ...
1
vote
2answers
42 views

Simulating a linear voltage regulator with ngspice

I am trying to simulate a simple linear regulator using gschem and ngspice. However, my output voltage varies by over a volt as my input voltage goes from 10V to 20V. Can I reduce this swing in the ...
3
votes
0answers
43 views

LTspice: Noise simulation AND AC analysis in one plot

Is it possible to run a noise simulation and an AC simulation independently from one another and display the results in the same plot? Or better, is there a way to determine the SNR in one single ...
1
vote
0answers
19 views

Use a parameter in the measure statement in spice

What I want to do I have a circuit simulation where at the top, I have .csparam VDD=1.8 I want to have a measure statement that measures rise time (the amount ...
0
votes
0answers
44 views

Simulating TI Products in smartspice (without TINA-TI)

UPDATED PROBLEM I am interested in simulating a TI Operational Amplifier OPA188AID and am having some issues with correctly creating a symbol in smartspice using the model provided on TI's website. I ...
1
vote
0answers
98 views

A band pass filter simulation in PSpice

I designed a Constant K (I don't remember the constant K) LC band Pass filter with lower cut off frequency 1 KHz and upper 5 KHz. Using the value of K, I deduced the values of L and C and made the ...
2
votes
1answer
56 views

Free spice Model to simulate integrated circuits design

I am using ltspice and I would like to simulate integrated full custom circuits for educational purpose. I found the NMOS4 and PMOS4 models but there are not enough since there are too ideal there ...
0
votes
1answer
26 views

Using Models from PSPICE in ISPICE

How can I use a model from PSPICE into ISpice? I've been told that Spice models are roughly cross engine compatible. Intusoft ISpice has a really easy UI, but doesn't have as many models included as ...
0
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0answers
70 views

Spikes in full adder Spice netlist

I currently have a 1 bit full adder waveform which has the following circuit and here is the following netlist which I will simulate via Hspice ...
2
votes
1answer
73 views

LTSpice Level 2 Simulation CMOS follower

I'm trying to make a level 2 simulation of a voltage buffer made by a CMOS circuit: For this, I have been told to use level 2 CNM25 technology Spice models for the transistors, and I have been ...
0
votes
1answer
80 views

How to simulate an AC line filter in LT Spice

I'm fairly new to LT spice and am trying to simulate an AC line filter, but it keeps giving me the error K1: coupling to shorted out (ignored) inductor L1. What am I doing wrong? Here's the circuit: ...
1
vote
1answer
103 views

How to design a SPICE model from data sheet?

I am new to SPICE simulation and I am looking for spice model file of LTC 1065 data sheet can be found here here. I searched a lot on Google but I could not find ...
0
votes
0answers
34 views

HSpice optimization of parameters not achieving desired value

I use HSpice. I have a spice netlist wherein the TPHL and TPLH of my circuit should be less than 3%. I use the Spice optimization parameter as indicated here ...
2
votes
1answer
157 views

Is there a spice directive to export waveform data in LTspice?

http://www.linear.com/solutions/1815 The above web-page explains how to export the waveform data to a text file. You basically run the LTspice simulation, clicking on the waveform window, go to ...
0
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0answers
85 views

Error on SPICE simulation in Tanner

I am trying to make a simple CMOS NOT gate using Tanner. I have made schematic using S-Edit. On simulation, A error is being thrown. ...
1
vote
1answer
77 views

making Tphl and Tplh equal

Let's say we have the following netlist ...
3
votes
2answers
226 views

How can I simulate a bridged output of a speaker at 8 ohms?

Following on from my previous post on a single 5V rail amplifier, I'm trying to simulate a bridged output op amp set up to drive an 8 0hm load. One of the solutions was: Use a bridge output. This ...
0
votes
1answer
79 views

Verilog to spice using v2s- specificing the port order in the command v2s

I was trying to convert from verilog netlist into a spice netlist using the option v2s. Can I specify the pattern in which the ports will be arranged in my ...
0
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0answers
56 views

SPICE analysis of a ring modulator

I'm designing (for fun and understanding) a simple 100 MHz BPSK modulator. I've found a simple implementation (from http://en.wikipedia.org/wiki/Ring_modulation). Haven't worried about pulse shaping ...
2
votes
2answers
97 views

ngspice, malloc: internal error can't allocate -8 bytes

I am new to ngspice and trying to simulate my first circuit. I have posted my spice.net and my simulation.cmd below with a picture of my schematic. When I run the simulation I get the error message: ...
0
votes
1answer
46 views

Inverter not showing the right output in HSPICE

This is the code snippet apart from the usual headers in the rest of the file: ...
1
vote
0answers
12 views

Format of node identifier in ngspice

I am writing a script which generates ngspice netlists from an application data-structure. I am not sure if I can have _ in node names. I looked at documentation ...
0
votes
1answer
60 views

How to comment at the end of a command in LTspice?

Commenting in a spice file is quite straightforward. Start a line with an * and the entire line is a comment. The first line is ...
1
vote
0answers
86 views

How to model Texas Instruments UCC28700?

I'm using Multisim in an attempt to simulate a flyback supply design reference by Texas Instruments that makes use of a voltage controller - the UCC28700. Multisim has no SPICE model natively nor does ...
0
votes
1answer
286 views

LTspice: How to convert .asc file to netlist?

Using LTspice I can create .asc files which contain the information about my circuit. Is there a way to convert this information to a netlist? I am looking for a ...
1
vote
0answers
431 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 ...
1
vote
3answers
911 views

Is there a portable alternative to LTspice? [closed]

I am constantly on the move and come across many computers to which I have access and which have some version of Windows installed. I was wondering if there's a portable alternative to LTspice (or if ...
1
vote
1answer
129 views

From curves to SPICE model

In the lab I measured the Vgs x Id and Vds x Id curves of a MOSFET transistor (actually, the CD4007 IC that has 3 PMOS and 3 NMOS transistors within). How would I go into turning this data into a ...
1
vote
2answers
424 views

NMOS CS Amplifier PSpice Simulation Question

I have a rather peculiar question. I am attempting to recreate the circuit below (from one of my labs) of a Common-Source Amplifier design with a bypassed Source Resistance in PSpice. It has the ...
1
vote
0answers
36 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 ...
1
vote
1answer
272 views

How to model IR LED Diode in SPICE [duplicate]

How does one model an IR diode in SPICE? Specifically, the TIL38. Datasheet here: http://www.supermoduul.com/PDF/TIL38.pdf I get it that Is needs to be found - ...
0
votes
1answer
104 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 ...
0
votes
0answers
331 views

Trying to use INA2128 op-amp (or INA128, a similar model) in Proteus ISIS

I'm trying to simulate an EMG-signal amplifier that I got the schematic for from one of my seniors at my university. The signal strength varies from 3mV to 10mV, and the amplifier takes it up to 5V. ...
2
votes
2answers
139 views

How to break components in SPICE?

I've been learning SPICE over the past few days, using the LTSPICE program. One thing that just escapes me, is how exactly do we know when a component's absolute maximum ratings have been exceeded? ...
0
votes
1answer
41 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 ...
1
vote
1answer
72 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?
0
votes
2answers
164 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. ...
1
vote
1answer
119 views

spice representation for mechanical problems

As a mechanical engineer, for my work, I need to compute some displacements which are represented as a summation of frequency dependent admittances on a structural system and I would like to use this ...
3
votes
3answers
358 views

Singular error when putting a current source in series with a capacitor (ngspice)

I am getting singular errors when I simulate a current source in series with a capacitor with the following .cir file: ...
1
vote
1answer
73 views

gnetlist Cannot Find Symbol

I am trying to use gschem/gnetlist/ngspice to do some circuit simulations. I have a subcircuit schematic and have created a symbol. I am able to add the symbol into the higher level schematic in ...
3
votes
2answers
118 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 ...
0
votes
1answer
65 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 ...
0
votes
1answer
91 views

SPICE and conditional execution [closed]

Is there a SPICE simulator that allows the user to write some control algorithms within it in the same way as SIMULINK S-function blocks do? I wonder if there was a block in which I can put my ...
1
vote
1answer
157 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.