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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?

In another topic, Matthew D'Entremont said he was looking for a PD55003 LDMOS model. I searched the group's archives but do not find any files with "PD55003" in the filename or description or (cleartext) contents. If it is in a .zip file, it would not find it unless the name or description includes that text. Andy

Is there a non-linear model for Mini Circuits PHA-13HLN driver PA that someone can share with me?

Hi all - anyone seen or been bitten by this? I'm working on a middling-sized circuit, nothing fancy, all passives and library ADI opamps, inamps and diff drivers. Implementing a little gain and (as you'd expect from me) some filtering functions, including some series LC traps close to the inputs. It's one of those circuits that's on the edge of not finding a DC op point (24.0.12 on this work machine, 24.1.x deffo not ready for salaried work IMHO). Series traps are from signal nodes to ground. So there's a capacitor on the branch between that node and ground. So in principle it cannot participate in any DC op point calculations. But... I get to the point where, slowly dropping down the inductor's series resistor (most tests with internal but external seemed similar), I would cross a threshold where it couldn't find an op point. Quite abruptly; for instance, Rs >=65 gave an op point, Rs <=64 and lower did not. (alternate solver; didn't test normal). So, clearly, the NAM must have some DC path across that cap. Tried changing the Gmin setting from default 1E-12 to 1E-14. Success! Now all realistic configurations give me an operating point. This is something that could be fixed (hi @mstokowski and @mborn) - by making sure that Gmin==0 across any capacitor that's not otherwise set up to be different, _just_ during the op point search. Of course the DC solver needs to be robust to hanging branches so there might need to be some topology trim/prep, solving a slightly different matrix (the caps in series case will probably be irritating). So not trivial, just simple... I have a sneaking feeling that some of my older op point troubles could have been fixed up this way. Another way of doing this would be to have a flag for a capacitor to explicitly set Re (shunt admittance) to zero - but that's much more work for the user. Better for the code to do it inherently (perhaps with a setting choice box). Of course 24.1.5+ might already have fixed this, I can't try that until at least this evening. Hope this is interesting and relevant -- K PS (1) how do you stop the .log file from popping up at the end of each sim now, annoying and (2) where did the little display of the key for which .step plotted to which color trace go?

Hello, I am interested to verify/replicate through simulation using LTspice the plot: 15 Typ. gate charge -> VGS = f(Qgate);I D = 25 A pulsed, parameter: VDD for this N-channel MOSFET from Infineon: IAUC50N08S5L096 I took the model from Infineon site: SimulationModels Do you know if exists any ltspice simulation file example for this thing on how to do correctly? I tried a simulation, but I do not know if the simulation set-up is pretty good/correct. Please see: /g/LTspice/files/Temp/Gate_Charge_Characteristic_Mosfet.zip And to have Qgate for time axis I need to plot time*Ix(M1:D), where Ix(M1:D) is the current through drain of the mosfet, right? But then how to make in such a way to have the range for x axis of the VGS plot 0nC...24nC? Thank you.

Hi LTspice Group, I have simulated a filter which is a cascaded of two LC low-pass filters. I get the Bode plot Magnitude in dB versus frequency and phase versus frequency. However, I need to display the magnitude in dBuV versus frequency. dB is just a value but dBuV is a value with reference 1uV. I tried few things but no one worked. Is there a way to show dBuV vs Frequency? Has anyone tried it before? LCLC filter is uploaded. Comments are appreciated! Ray