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Is it possible to make a PWM signal a continuous voltage source ? I have these PWL points in a file but simulating this I have transient response and decay behaviour. I would like to do a FFT on the filter output signal and the presence of these spoil the FFT picture. Using a sine as a voltage source it behaves like an infinite signal while the PWL from file is always finite, seems so. I tried the statement: PWL REPEAT FOREVER ( | one_period.txt) ENDREPEAT from the undocumentedcommands section of the wiki to no avail. The "|" (pipe symbol) gives an error. -- Christoph

The following circuit configuration was unintentional, but caused an LTspice program exit upon simulation run. * Generated by LTspice 24.1.7 for Windows. I1 0 0 1m D1 0 0 D V1 ADJ 0 0 .model D D .lib (path removed)\standard.dio .dc I1 2u 2m 100n .backanno .end

Hi, This topic can be closed. I translated the description incorrectly (conductance vs. resistance)... Thanks. Marco

Hi, First of all: Many thanks to all forum members. The group is really very helpful and detailed. I have read several times that gshunt, for example, can be used for convergence problems. According to the description, this is a resistance of a node to ground. Why is it chosen so small? Logically, I would have estimated it to be very large in order to minimise the influence of the ground potential. Thanks in advance, Marco

Good morning.... I'd like to know why LTspice simulates a TVS diode as a zener, even though its behavior isn't exactly the same. I'd also like to know where I can find an LTspice library for some TVS diodes, for example, that are 15 volts and others that are around 140 volts, and that are bidirectional. Thanks...for everything.

I'm again at simulating a PWM. The pulses are generated from a file with the statement: PWL file=pwm_pulses.txt It's a while back I generated that file or in other words, I generated a new dataset for that file and I'm suddenly gettings somthing like "time value pairs for V1 out of chronological order". To narrow down the cause, I'm in need again for the file format of such a pulse input file. Where again can I find the documentation for that? I found the PWL section in the wiki but I blinded what the file format is concerned. Thank you. -- Christoph

The one from my university account bounced, saying I'm not subscribed with that (physics) address. This one goes through? -- Christoph

Hi, I'm new to the group and also still a beginner with LTspice. I'm currently using LTspice 24.0.12 — should I rather download the newer version? My actual problem is that I want to integrate components from Texas Instruments. I followed this video: https://www.youtube.com/watch?v=8V5XabccFaE&list=PLT84nve2j1g_wgGcm0Bv3K4RSl2Jdjsey&index=4. One thing that's different for me: when I click "Create a Symbol," I have to manually save it. I've always saved it in the lib/sym folder. Otherwise, I’m doing everything the same. It sometimes works with simple components, but with ICs I often get error codes. Is there a new method for this? Thanks a lot!

Hi all, I’m implementing an inverse Jiles-Atherton model in LTspice, mainly based on this paper: https://ieeexplore.ieee.org/abstract/document/996206 The simulation stops around a quarter cycle. It seems to get stuck when "dH/dt" approaches zero — likely because of "delta", which is the sign of "dH/dt" I’ve tried replacing the "delta" with a smooth "tanh" function, but the oscillation and convergence issue still remains. Any suggestions on how to solve this problem? I've posted my schematic here: /g/LTspice/files/Temp/invJAmodel_dynamictest.zip Thanks!

Hello, New LTspice user. I am trying to build a model for MJ11021 to be used in an AB amplifier simulation. Link to Datasheet. I made an attempt in building a model for the part PNP type first. I also created a simulation to validate against the datasheet. Validation part 1: DC simulation to Verify hFE and VCE. Never got past part 1! Part 2: Transient simulation to measure switching time. I have uploaded the files to temp directory under /g/LTspice/files/Temp/MJ11021.zip It is not working and I am having a hard time figuring out how to fix the parameters in order to get it validated. Any help and guidance in how to proceed to fix/tune the model parameters and how to setup the simulation to validate the model against key datasheet specs. would be greatly appreciated. Thank you in advance.

Hello guys. Please help my Thesis. I want to make Comparators design of sar adc i have built Comparator in LTspice i wanna analysis. But i cant PLEASE HELP ME OUT

Hi All, I had a discussion with LTspiceVXII and LTspice24 users about the accuracy of measurement results, shown up in the spice error log. To verify how the constant “pi” is handled, we made a simple example, such as: .opt plotwinsize=0 numdgt=15 measdgt=15 .param x=pi .param y=sqrt(x) .param z=y**2 .op or .tran .meas z_value param z .meas x_value param x Spice error log shows: z_value: z=3.14159265359 x_value: x=3.14159265359 To our surprise, we observed different results between users, although the same setup was implemented. Mike Engelhardt’s LTspice XV!! Help-file Copyright ? 1998-2018 Analog Devices Corporation Shows on page 105: The following constants are internally defined: Name Value E 2.7182818284590452354 pi 3.14159265358979323846 K 1.3806503e-23 Q 1.602176462e-19 The solver was set to ?Alternate“. We assume, "Alternate" is 1000 times more accurate compared to “Normal” My question is now a general one, independent on the practical significance of pi: What is the accuracy LTspiceXVII and LTspice24…. Is using for calculations and measurements, shown in the log-file ? and are there differences between LTspice versions? Thanks a lot in advance --- regards Udo

Hi, I have models (.suckt) that are working perfectly in LTspice, when I import them in Qspice they dont work Does Qspice use a different syntax? Regards, Suded

I wondered if anyone has seen a spice library for the CD14538B that will work in Kicad (ngspice). So far I haven't found one that works inside Kicad without spitting out errors. Thanks Al

This has been asked before and I am just looking for the schematic: Files > Temp > Constant_phase_element1.asc Here’s the old request and answer, Helmut did a great job but I can’t find the schematic. --- In LTspice@..., "Helmut Sennewald" <helmutsennewald@...> wrote: --- In LTspice@..., "ks_bilder" <transients@> wrote: Hello, just started using LTspice and I don't know how to do the following: In electrochemistry it is common practice to use a so called constant phase element (CPE) in impedance analysis of electrodes. The CPE is defined as follows: Z = 1/( C * (j*w)^alpha ) where Z is the impedance, C equivalent capacitance, j imaginary unit, w=2*pi*freq and 0 < alpha <= 1. For alpha=1 the CPE is identical to an ideal capacitor. What is the best way to define such an element in LTspice? I would like to use the element in AC as well as in time dependent modeling. any help is appreciated! Klaus Hello Klaus, Do you have some literature how other people have simulated it? I think only a Laplace function can do the job. There is absolutely no problem with any Laplace function in the frequency domain simulation in (LT-)SPICE (.AC simulation). The transient simulation (.TRAN) can make a lot of trouble with these functions. The most important rule for transient simulation is at least with LTspice that the value of a Laplace function should fall to zero for high frequencies. This means function with 1/s, 1/s**2 are good functions. Now to some examples. The value of the parameter alpha can be defined with a "param"- statement. The character for exponent is ** and not ^ in LTspice. .param alpha=1 CPE with G-source: OK in .AC but bad in .TRAN Laplace=1e-6*s**{alpha} CPE with E-source: OK in .AC, useful in .TRAN The E-source circuit requires an additional current meter. It's also necessary to add a small real value of 1u(1e-6) to get useful results. LAPLACE {I(V2)} = {1/(s**{alpha}*1e-6+1u)} I have uploaded a test circuit to the Files section. Files > Temp > Constant_phase_element1.asc Best regards, Helmut

I Am trying for 20nm FinFET design and i have 45 and 180nm done but i cannot find any file for 20nm with 54 or any other level for ltspice. if anyone have this file please provide it to me also there's something called BSIM model file if you have this then it's also fine but I don't know how we use this file in LTspice. Please, Reply ASAP

Hi, : I am curious about the black hole, so though it's almost impossible, but ...maybe someone who might have studied that before...that's did anyone study hard about the black hole very well and have built black hole model already ? Recently, I heard that, there is theoretically sayings which states "in the black hole, the time-space is exchanged, which says in the black hole, the moving-direction is only one way direction, and the time for the one inside the black hole is very slow (from viewpoint of the outside one from black hole), it seems meaning, in the black hole, space is only one way direction while the time could be varying forward ,backward, rightward, leftward, etc.(time-space exchanged)" , so that this saying caused me the question , is that possible that we are all living in a bigggggg BLACK HOLE, which includes the whole universe, and in this bigggggg BLACK HOLE, the time is one way direction, the space is traveling-abled, as we experienced so far, but if this theory states is correct, would that means outside this bigggggg BLACK HOLE, OUT THERE, time is traveling-abled, and space is .....one way direction- LINED UP ? I don't quite know what's that, so that's why I'm here and the request, I hope to know more about the black hole , have anyone already built one ? Thank you very much Best regards.

Hello ,I have created a two plots of Id vs Vgs and d(Id)/d(Vgs) [also known as gm] vs Vgs as shown in the attached link. how can I create gm vs Id plot which unites the two? Thanks. /g/LTspice/files/Temp/2.zip

I haven’t found the ability from the /g/LTspice page to download the files from /g/LTspice/files/Temp. Is this because of firefox or firewalls?

Is there a non-linear model for Mini Circuits PMA3-73-1W+ PA that someone can share with me?