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

learn more… | top users | synonyms

0
votes
0answers
13 views

Application Note 101 Switching Regulator spike simulation

Has anyone every tried creating the SMPS ripple and spike simulator (as described by Jim Williams), using Spice. I am trying to do so for a week now, but still not getting anywhere close to the curves ...
0
votes
1answer
28 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
19 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
0answers
20 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
48 views

NGSPICE messing up BJT characteristics

I'm trying to obtain BJT characteristics in NGSPICE, but for some reason the plots retrace to origin. ...
0
votes
1answer
22 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 ...
0
votes
1answer
34 views

How to plot I vs V for multiple circuits in one graph? (NgSpice)

I have to see the I-V characteristics for five different LED model files. I'm using ngspice and I want to plot all five I-V characteristics in the same graph. What do you think I should do?
0
votes
1answer
23 views

NG-Spice / Macspice - plot source current?

It seems that you cannot plot current for circuit elements directly and will therefore have to make use of a series 0V source to display a graph of current vs time ...
2
votes
1answer
28 views

semiconductor resistor vs resistor in SPICE modeling Altium

I'm doing some SPICE modeling using altium and would like to apply the temperature coefficients of the passive components for a more accurate simulation. However, as far as I know, in altium the ...
0
votes
0answers
22 views

Simplest way to define alternating voltage/current force

If I need to force a voltage on a node in one phase of the simulation, and inject a current in a different phase, and I do not want to specify the circuits that will do that for now, what's the ...
1
vote
0answers
28 views

How do i write if-else control statements in ngspice? the syntax does not seem to the same as that of pspice

I downloaded a pspice module from the CEL website which includes the command: ...
0
votes
0answers
15 views

Multism Wire Voltage

I'm new to NI Multisim. Is there a way to view a wire voltage while a circuit is running? Also is there a way to see if a wire has current going through it? If this isn't the right place to ask this, ...
3
votes
3answers
104 views

SPICE model for one terminal spherical capacitor

I have a circuit where at least some of the capacitance is coming from large, non-radiating, spherical conductors. I would like to model it in SPICE to better understand its operation-- is such a ...
2
votes
2answers
62 views

Parameterizing diode value in SPICE

I have a bunch of diodes of the same type on a schematic in LTSpice. How do I parameterize the diode's type (Value) so that I can change it in one place and it would change it for them all? The ...
0
votes
1answer
75 views

This circuit has floating nodes in LT Spice?

This is the circuit I'm working on. This circuit probably doesn't work as intended to begin with, but that's not the point. LT Spice keeps complaining that it doesn't have a reference to ground. I ...
0
votes
1answer
27 views

Reverse breakdown voltage setting for the diodes in a solar cell model in SPICE

I want to simulate the reverse breakdown behavior of a two diode model solar cell in SPICE. The diodes configurations without considering the breakdown voltage are as below: ...
0
votes
0answers
48 views

How to reduce voltage of an SRAM cell in HSPICE?

I have a simple 6T SRAM cell and I would like to reduce its voltage VDD for a short period of time. I expect the cell node Q and QB to flip after pulling the voltage supply to zero or at least to ...
0
votes
1answer
41 views

HSPICE code to cut off supply voltage of a subcircuit

I am trying to cut off the supply voltage "Vcontrol" of a subblock "circuit" for a very short time using a pmos, a nmos transitor and a voltage source. The Hspice code is as follows: ...
1
vote
0answers
30 views

Referencing DC Operating Points When Plotting Expressions in LTspice

I'm new to SPICE, and I have a question about SPICE commands and references. I've been using LTspice to design a multistage amplifier, and I am interested in plotting out the outputs of each stage, ...
0
votes
0answers
26 views

HSPICE subcircuit design problem

I want to design below circuit in HSPICE , Technique used is GDI . The Code is given below. ...
1
vote
1answer
75 views

Passing user parameters into a custom PSpice model

I am building my own simulation parts in Orcad 16.6: I can build a schematic and take the generated netlist to use as a stand-alone component, but I want to be able to change parameters inside the ...
0
votes
1answer
54 views

LTSpice Measurement on Plot

I am modeling different circuits in LTSpice and I cannot for the life of me find ways to annotate the plots with measurements. How can I perform simple measurements such as measuring 3dB points, max ...
3
votes
1answer
110 views

Regulator circuit design

I need to design a regulator for my thesis, but I really need help, Please! The topic: - A temperature regulator for a small fridge Some details: - the regulator has to control a peltier element ...
0
votes
0answers
32 views

how to solve mosfet size match error in tanner 14.1 for 0.18um process

I have refer your answer for spice simulation. but it is not going with 14.1 version. please help me with respect to 14.1 version.
0
votes
1answer
76 views

SPICE how to assign a variable voltage generator for receiving antenna

I would like to do an AC analysis, noise analysis and signal to noise simulations using TINA TI - LT spice is OK How do I assign a variable voltage with parameters to an AC voltage source in SPICE? ...
2
votes
1answer
136 views

power supply oscillates when loaded with instrumentation amp

I've been working on an instrumentation amplifier for a PWL ECG signal in LTSPICE. It should be able to filter out the common mode noise. I Also need to design a power supply. Both the power supply ...
1
vote
0answers
80 views

Convergence problem in pspice but not in ltspice

I am trying to simulate a circuit in LTSPICE and it simulates without any convergence problems. However when I copy the netlist into pspice and try it simulate it I get strange results. It keeps ...
0
votes
1answer
282 views

AC/DC wall adaptor as LTSpice Analog behavior model (ABM)

Suppose a circuit shuld be supplied ( in real life ) from a wall mount AC/DC adaptor. The adaptor has a nominal voltage of 12VDC 500mA. With no load the adapter puts out 21.6V. After some measurement ...
0
votes
0answers
192 views

How do I import a spice model into QUCS

I am trying to import one of the spice models (from here) into QUCS. I haven't been able to find much documentation about this except for vague hints that it is possible.
0
votes
0answers
49 views

Power feeder current and LTSpice simulation

I'm trying to develop a power feeder as already state in question Power feeder scheme adaptation. I have done some adjustments, now my circuit is The voltage regulator is an LM317. Since I have to ...
1
vote
1answer
158 views

LTspice MOSFET width sweep

I am trying to simulate the transfer characteristics of a CMOS inverter using LTspice. I want to sweep the MOSFET width and length and observe the effects on rise and fall times of the CMOS inverter. ...
0
votes
1answer
179 views

Where to get PSPICE models of ceramic resonators?

I wish to design and simulate IF filters using ceramic resonators and crystal oscillators in OrCAD Capture or LT SPICE. The default libraries don't have any ceramics, so anyone know where to download ...
0
votes
0answers
88 views

HSPICE multithreading problem

I am running a transient analysis on a large-sized analog circuit. To speed up the simulation and to conduct experiments I would like to invoke multithreading or the HSPICE Precision Parallel ...
0
votes
0answers
57 views

Spice model for a latching relay

I need a latching relay model, ideally for DPDT, (http://www.digikey.com/product-detail/en/TX2-L2-12V/255-1782-5-ND/570918) and can't seem to find anything like that. I am hoping some awesome SEer ...
1
vote
1answer
104 views

DC Motor inertia voltage drop

following a tutorial on the web I created in LTSpice a DC motor model, but I have a question about the results, the model is: and this is the spice netlist: ...
0
votes
0answers
64 views

How to plot curves in ngspice with proper x and y-axis parameters

We are currently being introduced in our class to ngspice and I have this homework that asks us to graph the Ic versus Vce curves of a common emitter amplifier for different values of Vbe. The circuit ...
1
vote
1answer
129 views

Complementary MOSFET symbol in Multisim(Electronics Workbench)

It is just me or symbol for complementary mosfet pair in NI Multisim is wrong? And actually not just the symbol, but the function itself - it doesn't work as it is supposed to(or it's just me being ...
0
votes
1answer
401 views

Depletion Mode MOSFET Modelling in SPICE

Does anyone know how to model a depletion mode N channel MOSFET in spice? I have looked online however the majority of resources have shown how to model a depletion type or enhancement type. I ...
0
votes
0answers
30 views

avgpower in spice for subthreshold leakage

Assume one NMOS transistor is defined in a spice code. There are two sources ...
0
votes
1answer
309 views

'Missing subcircuit' when creating a Pspice library part from the OPA188 Spice file provided by TI

I created a Pspice part using the Spice file provided by TI. When simulating, I get the following error: ERROR(ORPSIM-15108): Subcircuit RNOISE_FREE_0 used by X_U1.XR101 is undefined ...
0
votes
1answer
119 views

SPICE model of DRAM

Is there a SPICE model for DRAM developed? I am interested in any type of model at any level starting from DRAM memory cell and towards to whole memory VLSI circuit. I am seeking for a DRAM operation ...
0
votes
0answers
65 views

Edge triggered master slave flip flop with transition gates spice

How can i create the netlist in ng-spice for this circuit? I don't know how to connect the transition gates.Any help?
1
vote
1answer
2k views

how to resolve floating node error in pspice

I would like to run an AC sweep for a very simple circuit (Please see the image). Unfortunately the following errors occurred: L_L2 N04540 0 .10976mH R_R3 N04968 N02907 ...
1
vote
1answer
88 views

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 ...
1
vote
0answers
205 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 ...
1
vote
2answers
425 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 ...
0
votes
0answers
133 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 ...
0
votes
1answer
109 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 ...
1
vote
1answer
40 views

Units of area parameter in ngspice

Can anyone tell me what are the units of area parameter used in ngspice?
3
votes
1answer
589 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 ...