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.

learn more… | top users | synonyms

0
votes
1answer
12 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
votes
2answers
39 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 ...
0
votes
0answers
13 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 ...
0
votes
0answers
20 views

Harmonic distortion sweep in QUCS

Is there a way to measure THD or THD+N vs frequency in QUCS? THD+N: It would need a notch filter that tracks the AC sweep to remove the stimulus signal, and then compare the RMS amplitude before and ...
-3
votes
0answers
21 views

Help with HSpice [duplicate]

I got this PC with a HSpice installed and whenever I try to do a simulation, the I get this error message mid-way: ...
-6
votes
0answers
48 views

What's a .lis file really supposed to look like

So I'm trying out HSpice. Suffice to say, I didn't acquire it through proper means. So now I'm actually thinking I got a bogus software (but not a malware) or that I failed to install it properly. ...
3
votes
0answers
44 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 ...
1
vote
0answers
21 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
46 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 ...
1
vote
1answer
40 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?
0
votes
2answers
38 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 ...
0
votes
0answers
20 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
81 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
votes
1answer
31 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
vote
1answer
85 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
votes
1answer
37 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
votes
1answer
49 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 ...
0
votes
2answers
63 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
31 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
87 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 ...
0
votes
2answers
141 views

LTSPICE - How to create PWM with rise time

A simple PWM circuit is simple to create using LTSPICE, such as: ...
1
vote
0answers
48 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 ...
2
votes
1answer
49 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
51 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
votes
0answers
60 views

Electrical modelling of Diode

I have measured Time constants for diode in DC terms.Now i have to work on my pulse measurements.So my question is,Is there any link that i can use time constants of DC measurements for pulsed ...
0
votes
1answer
31 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 ...
0
votes
2answers
94 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 ...
1
vote
0answers
49 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 ...
0
votes
0answers
46 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. ...
1
vote
2answers
115 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 ...
1
vote
0answers
49 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 ...
0
votes
0answers
12 views

opamp in spice simulation

I am trying to simulate an opAmp in PSPICE. The code is as shown below - V1 1 0 PWL voltageVary V2 2 0 3.3 X1 1 2 4 0 3 ISL70218 R1 3 0 10K .PARAM voltageVary 0 5 1m 5 4m 5 5m 0 6m 0 9m 0 10m 5 11m ...
0
votes
1answer
29 views

Subckt design in SPICE

How can I do my own sub ckt for SPICE. I want to design a potentiometer(for eg). Assuming it in the form of a block model - it will have 3 pins - 2 pins for the resistor and 1 pin for the centre tap ...
1
vote
1answer
75 views

spice modelling of variable resistance

I am trying to simulate a load in SPICE(PSICE). This load is modeled by a resistance that can go from a high value(thereby sinking low current) to a very low resistance that can draw a large amount. ...
2
votes
1answer
87 views

Help with coupled inductor using Partsim

I have created the following circuit in Partsim. When I run the DC Bias analysis, the circuit on the left side of the coupled inductor behaves as expected. However, I do not see any voltage appearing ...
0
votes
1answer
52 views

Self Heating of LED

I am using Red LED connected to B2902A SMU which can display current Voltage curve only.But i need to find out what is the temperature(Self heating) and how to find it using I/V curve.So that i can ...
1
vote
1answer
53 views

Spice Error: Too few nodes

I am trying to simulate a circuit using .subckt directive in Ngspice-26 to define NAND GATE and NOT gate. I have two separate subckt files for inv and nand as inv.txt and nand.txt which I include in ...
2
votes
2answers
76 views

LC circuit + diode problem ! (without resistors)

[![][2]][2] What will be steady state capacitor voltage? My hit at the solution: The static resistance of the diodes come into action causing a large current to flow across the diodes ( assuming ...
2
votes
4answers
216 views

Inverting Op Amp: Why does current flowing into output seem to magically reappear at ground?

I'm trying to understand the flow of current through the inverting op-amp circuit. I've created a simulation: The thing that is baffling me is: How come the values of PR1 (op-amp output) and PR2 ...
0
votes
0answers
121 views

Master Slave Flip Flop Issue

I am trying to implement JK Master Slave circuit in Proteus ISIS. As the Master Slave circuit of JK Flip Flop overcomes the racing effect so this circuit should work. But it is giving the following ...
0
votes
1answer
22 views

SSTA analysis using Cadence SoC Encounter

I would like to do SSTA analysis using Cadence SoC Encounter. This tool requires the SPICE netlist. Does the costumers have access to TSMC's or any other vendor's spice netlist?
2
votes
1answer
138 views

LTSpice netlist: plotting Vth vs length

I'm using LTspice on Mac, and trying to only use netlists, no GUI. I'm trying to follow berkeley ee240. They use a model that I don't think is available online so I'm just using default mosfet models. ...
0
votes
0answers
42 views

How to model half bridge in Spice?

I tried to model a MOSFET half-bridge in Spice like this: ...
1
vote
2answers
105 views

How to model output pin of microcontroller in SPICE?

I'd like to model an output pin of a microcontroller (MSP430F5xxx) in SPICE. The datasheet contains this: This is the I-V graph for a pin which is configured as output and set to logic low. There ...
1
vote
0answers
69 views

Total integrated noise in QUCS

In PSpice I can use DB(SQRT(MAX(S(PWR(V(ONOISE), 2))))) to get total noise of an AC noise sweep in dBV. V(ONOISE) is a frequency ...
0
votes
1answer
41 views

Nested loops in ngspice

I am having some problems regarding using loops in the control section of ngspice. Specifically in this example: ...
0
votes
0answers
40 views

Computing simple mathematical expression in Or cad 16.6 SPICE Sub Circuit net list?

I want to compute a simple expression inside the SPICE subcircuit without assigning that expression to any of the nodes. The code is given below. ...
0
votes
1answer
38 views

Two-tone alarm issues

I'm working on an inclass project, for a two-tone alarm circuit. The 3V source represents two AA batteries. We've implemented this successfully on a breadboard. The IC used for the Inverted Schmitt ...
1
vote
1answer
83 views

NGSPICE messing up BJT characteristics

I'm trying to obtain BJT characteristics in NGSPICE, but for some reason the plots retrace to origin. ...
1
vote
1answer
110 views

I want to make a cd4049 cmos inverter spice model

I know the cd4049 is just two FET's but I don't know how I can model those transistors to be at least near what one would expect from the behavior of the IC. Also, what parameters are absolutely ...