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

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Designing and simulating a common source amplifier circuit

This is the problem: And this is my design for R1 and R2: So, using B2 Spice simulator I made this circuit according to the design: Vin_ and Vout_ are voltmeters. But the problem is that ...
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12 views

X1 WIRE symbol in Intusoft IsSpice4

I am using Intusoft's Spice simulator and according to the manual on page 77 the WIRE is in the Interconnects/Generic category of the Parts browser. However, there isn't such category in the parts ...
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26 views

Spice transient measurement fails!

I'm practicing HSPICE and encountered a trivial problem! Why this code ...
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55 views

LTSpice missing an SSR Component?

I want to simulate some circuits with SSR component but LTSpice does not provide this. From Eagle and KiCad I learned I can create my own component diagram. I'm not sure if I can do this also with a ...
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74 views

IR2110 LTspice simulation weird behaviour

I am obtaining weird voltage behaviour at the gate of my high side mosfet controlled by IR2110 which is controlled by PWM. PWM configuration: Vinitial = 0 Von = 5v Tdelay = 0 Trise = 7u Tfall = 7u ...
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75 views

PSpice gives a crazy plot

I am simulating the following circuit The input voltage is a PWL voltage source that I configured to get a unit impulse input. From Matlab I know I am supposed to get this response But this is ...
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30 views

NAND equal rising and falling time in Spice

I have written a spice code to implement a NAND gate. Then I measured the switch time of that. (The time between change in input which effects the output). I want the rising and falling time to be ...
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35 views

Units of area parameter in ngspice

Can anyone tell me what are the units of area parameter used in ngspice?
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109 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 ...
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54 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 ...
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37 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 ...
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64 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 ...
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28 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 ...
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43 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 ...
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19 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: ...
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2answers
57 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 ...
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72 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 ...
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20 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 ...
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55 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 ...
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185 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 ...
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66 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 ...
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32 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 ...
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116 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 ...
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1answer
101 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 ...
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88 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: ...
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114 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 ...
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44 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 ...
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229 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 ...
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110 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. ...
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87 views

making Tphl and Tplh equal

Let's say we have the following netlist ...
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231 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 ...
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87 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 ...
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62 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 ...
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106 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: ...
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47 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: ...
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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 ...
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88 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 ...
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90 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 ...
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362 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 ...
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554 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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3answers
1k 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 ...
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1answer
145 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 ...
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509 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 ...
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40 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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288 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 - ...
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111 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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371 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. ...
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2answers
145 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? ...
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1answer
42 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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73 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?