A famous textual circuit simulator with a number of graphic front-ends. Please tag with the precise flavor used (e.g. Pspice, LTspice, ngspice, Multisim, Proteus, Qucs) whenever appropriate (e.g. syntax or debugging) because there are substantive differences between implementations.

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27 views

Signal Transformer Characterization for SPICE

I would like to capture the dynamics of a signal transformer (make a good model of it for spice) . I can characterize the transformer as a band pass filter with a gain, or use the built in ...
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25 views

Multisim model for Linear Technology products

I want MultiSim model for LT3480 and LT4356DE. Can anyone help me in this regard? I tried searching for the these two devices, but could not find them.
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2answers
43 views

Schmitt Trigger does not go to ground

i would like to create simple circuit to drive an computer fan (12V, 0.5A) is the temperature is above 42 celsius and stop when the temperature decreased below 36 celsius. I am simulating in LTSpice. ...
3
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2answers
162 views

Using Spice/PSpice (Vishay optocoupler) models in LTSpice

I am trying to use the Vishay-provided spice models of the 6N137 high-speed optocoupler in LTSpice. (Source: http://www.vishay.com/optocouplers/list/product-84732/) Both the "PSpice" model and the ...
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1answer
17 views

convert a .s2p file to spice model

can someone suggest me a way to convert .s2p (touchStone) files to spice models. I have checked with various sites like www.emwonder.com and www.spice-club.com suggested in some Forums but it really ...
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1answer
56 views

Why Doesn't SPICE Show the Discharging of a Capacitor after Input Voltage is Removed

I have a very simple circuit that includes a capacitor meant to provide a few seconds of battery-like backup to a few LEDs when power is removed. In real life, it does exactly that. However, when I ...
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1answer
36 views

How to use a subcircuit in capture / spice

I am wondering how to add an IGBT .subckt file to a schematic in Orcad Capture. I already found out that if you have an '.NIGBT' model, you can use the Breakout library. But I cannot find out how to ...
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18 views

Relabeling pin names of a model without replacing pin names

After downloading a model with pins only labeled as what seems to be hexadecimal numbers. I want to relabel the pin names. As the pin names contain integers, "find and replace" all pin appearances ...
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48 views

PSpice to HSpice conversion of a Transformer Rectifier Power Supply Circuit?

I was able to simulate the circuit in PSpice Student version, for the attached schematic. I am in the process of modifying the netlist generated in PSpice to HSpice , for which upon execution I get ...
6
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1answer
89 views

How to change the temperature of sub-circuits in LTSPICE

I have subcircuits of a solar cell (resistors and diodes) in LTSPICE. I want to connect the solar cells (sub-circuits) together. However, each solar cell has a different temperature. I can set the ...
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1answer
14 views

Are dependent resistor values possible in Xyce?

I need my resistor to be a function of a node voltage in order to simulate a battery. I can do this is ngspice by setting R=2*v(1), for example. Is this possible in Xyce (or is there a workaround)?
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40 views

Spice modeling of a comparator using zero-pole transfer function

I'm designing an open-loop comparator for an analog IC. I've followed the design procedure included in the "CMOS analog circuit design" by Holberg and Allen. I've established the required gain and ...
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1answer
39 views

Uniqueness of Transient Node Voltages [closed]

Considering only transient (not DC) simulations for circuits in which every node has a capacitor path to any other node (a stack of capacitors connects any pair of nodes), and in which all initial ...
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2answers
57 views

Demonstrating back EMF on an inductor in LTSpice

I'm trying to demonstrate back EMF on an inductor in LTSPice with this model: https://dl.dropboxusercontent.com/u/16979265/Draft2.asc I'm expecting the voltage on the inductor to have a negative ...
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1answer
52 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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4answers
80 views

High Pass filter gain at higher frequency than cutoff frequency

As i know , it's very common easy to find cutoff frequency and calculate gain at highpass filter. This is my circuit; simulate this circuit – Schematic created using CircuitLab My ...
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0answers
42 views

Orcad Capture add component via Breakout library

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 ...
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27 views

Does anyone have spice model parameters for 0.5W 32ohm or similar speakers?

I know that Re = Measured Voice Coil Resistance Le = Measured Voice Coil Inductance Fs = Resonant Frequency are the main parameters to make a reliable speaker model for .ac . So for a generic ...
2
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1answer
46 views

LTSpice parametric subcircuit instances

I want to compare signals from my fancy subcircuit (very complex) and multiple subcircuits level1 (should be almost equivalent, ...
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16 views

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 ...
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1answer
105 views

noise calculation for LM741 [closed]

my circuit is very simple, i want to calculation output when i apply 0 amplitude sine-wave to do circuit from datasheet, ...
0
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1answer
43 views

Open pin in circuit, how do I represent that in a spice model subcircuit?

I have a lm386 circuit that requires pin 8, gain8, to be disconnected in the circuit. So how do I write the spice subcircuit to account for no connection in the 8th pin? Example ...
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0answers
46 views

worst case analysis

I am trying to a worst case/monte carlo analysis of the following circuit. How do I proceed with ? I have Altium and PSPICE(the textual one and not schematic capture). The main components I want to ...
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1answer
28 views

ngspice - Measure param

I'm trying to post-process a value computed by a measure statement in ngspice (rev 26) as described in the manual: ...
3
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2answers
66 views

How signficant is leakage inductance in a flyback converter?

In designing some flyback DC-DC converters (to give us isolation), we have been simulating potential designs in LTSpice, which has gone well. (Isn't LT great at documentation? Pretty much perfect ...
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1answer
35 views

Convert voltage controlled switch into ngspice

I have a circuit file ADA4691 from Analog Devices and it has a different .model V SWITCH versus SW in ngspice with a VON And VOFF instead of VTH for one switching voltage. How could I approximate the ...
5
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1answer
184 views

Using crystal in LTspice (where to get values for RCL)?

I'd like to simulate a schematic in LTspice driven by a crystal. An capacitor representing the crytal (as a resonant circuit) however it needs some specific values. Is there a table of common values ...
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0answers
32 views

Array of parts with gschem and gnetlist

Anyone know how, or if it is even possible to create an array of parts/instances in gschem and netlist it with gnetlist. I'm trying refdes=name<0:n> and ...
3
votes
1answer
80 views

How to add a multi-emitter BJT to LTSpice?

I want to simulate the standard TTL NAND gate which contains a multi-emitter BJT transistor in LTSpice. I've searched the components available in LTSpice but didn't found this component. How can I add ...
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1answer
86 views

Is there an alternative to B2.SPICE A/D for Mac OS X?

I've tried B2.SPICE A/D on Windows and I liked it. Is there an easy-to-use application like B2.SPICE A/D that uses SPICE and allows drawing the schematic of the circuit and simulating it?
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2answers
50 views

SPICE Programs worth learning for [closed]

I was wondering what are the professional SPICE programs for simulating analog circuits in the industry now. For example, where the big companies like Atmel simulate their microcontrollers, or a ...
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0answers
61 views

NGSPICE - Sweep Subckt Parameter

I am playing around with NGSPICE and am having trouble sweeping parameters. I have a subcircuit that is modeled after an Ideal Op Amp. I want to sweep the open loop gain from 1 to 100 and plot Vout. I ...
3
votes
1answer
104 views

MOSFET fast turn-off not enough

I have a PWM bridge driving a higher than 1k load from 200V supply. The simplified, equivalent schematic is this: The drivers I'm using are slow turn-on/fast turn-off and, in the schematic, it's a ...
0
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1answer
41 views

Initial Seed for LFSR in PSpice

I am implementing a Linear Feedback Shift Register (LFSR) in Pspice A/D with a new logic family. Anyways, to initiate the random number generation I am required to feed in some value to the circuit, ...
1
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1answer
101 views

.TF Spice Simulation, output impedance with current as output

So I'm currently reading CMOS by R. Jacober Baker and in the first chapter there is a quick introduction into Spice but I have a hard time understanding one of its examples. So this is the circuit: ...
0
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1answer
52 views

LTspice `Icrating` of BJTs

I see LTspice has an Icrating parameter for BJTs. As far as I can tell this isn't part of SGP (SPICE Gummel-Poon model) and also not present in other flavors of ...
0
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1answer
56 views

Trying to simulate the linear region of a MOSFET

I wanted to simulate the linear region, so I tried this: simulate this circuit – Schematic created using CircuitLab I expected the triangle wave to be curved, but it didn't have those ...
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2answers
79 views

Automatic parameter search for a given output in LTSpice

I am simulating a circuit on LTSpice and was wondering if there is a way to set output parameters for LT to aim for by adjusting values of other components. I have used some software in the past that ...
1
vote
1answer
36 views

Ideal SPICE Model of Op-Amp with Power

I know that the ideal operation amplifier model is a single voltage controlled voltage source. My question is how to extend this ideal model, in a minimal way, to account for power supply rails (V- ...
2
votes
2answers
117 views

Simulation difference between two similar OpAmps

I preface this with saying that at one time, many many years ago, I had taken some EE courses. I remember only a little. I was simulating a simple non-inverting amplifier used in a DC setting as a ...
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2answers
683 views

LTSPICE - How to create PWM with rise time

A simple PWM circuit is simple to create using LTSPICE, such as: ...
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0answers
71 views

Using SPICE to model dV/dt filter for inverter motor drives

I am starting to learn LTSPICE to create model where I can test various passive filter topologies for inverter drives where the output PWM has very short rise times and high switching frequency. I ...
3
votes
1answer
104 views

Setting manual thermal voltage for a diode in LTSPICE

I want to simulate some series and parallel connected solar cells with the same reference temperature but different operation temperature for each cell. To do so, I need to configure the thermal ...
3
votes
1answer
65 views

Buck converter simulation

I am having some troubles to simulate a Buck converter in LTSpice. I added a picture of my schematic in which a use an IGBT (IRGP20B120U-EP from International Rectifier) and a fast recovery diode ...
0
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1answer
38 views

Is it possible to model a microwave resonator in SPICE [duplicate]

I just wanted to know if it was possible to model a microwave resonator in spice software or somehow import it from somewhere to spice to carry out analysis. Also if it is not possible to model the ...
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2answers
163 views

SPICE modelling of microwave cavities using a circuit

Hi I am new to SPICE and after doing some research into the spice software, I need some help understanding which type and how to model microwave cavities in SPICE. I want to model a microwave cavity ...
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0answers
132 views

Add a trace from a directive in LTSpice

I have a circuit in LTSpice in which I want to measure some differential voltages, currently I'm manually adding the traces using the "Add Trace" menu in the plot view and writing its expressions. I ...
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61 views

IGBT switching losses

I was wondering if somebody has experience in simulating the switching losses of IGBTs and MOSFETs in LTSpice. I would like to make my own IGBT models, based on the parameters given in the datasheet. ...
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2answers
214 views

Spikes, surges and noise sources in LTSpice

I am attempting to simulate a DC-DC power supply in LTSpice (using LT3748, 48V in, 5V 3A out). There is concern about the amount of noise that will be on the 48V input rail, and so we want to ...
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272 views

SPICE model for DRAM transistor

My research group wants to investigate how powder delivery network (PDN) noise (such as ground bounce) can affect the retention time of DRAM cells. The idea is that the power noise increases the ...