You must tell LTSpice whose netlist you want to export, and the last time I looked KiCAD was NOT one of the choices. After a little study of the original SPICE syntax, most of the SPICE model files intended for a particular version of SPICE can be converted to other versions. If you know of any that should be included, please let me know. LTSPICE *.sub models today are encrypted binary files. Wishful thinking but can the LTSpice models also be used on NgSpice? I have only used PSpice. For example, in the circuit below I want to calculate the values of C1b and R2b based on the values of f_p2, f_z2, and R1b. For basic semiconductor models, yes. Moreover, in contrast to LTSpice, ngspice is open-source, meaning that students can see the code, play with it, and modify it if they want. I’ve used it to launch LTspice using KiCad. I believe, for example, that LTSpice can read and process model files that use the PSPICE extensions. Animated electronic circuit simulator using ideal components to visualize voltage … I never noticed it until you mentioned it. ltspice vs pspice. Open Source LTspice Alternatives. Or alternatively, can I simulate on LTSim and get the netlist to PcbNew? It's mighty handy to be able to work on your circuit at home, and you can't do that if the PSpice license is at work. You may apply PSPICE or LTSPICE device model parameters and netlists for simulating discrete circuits. You may apply PSPICE or LTSPICE device model parameters and netlists for simulating discrete circuits. It's a 1 minute download and install. Powered by Discourse, best viewed with JavaScript enabled, http://ngspice.sourceforge.net/ngspice-eeschema.html. Figure 16. 83% Upvoted. Custom Ngspice build solves the following issues: Windows GUI of Ngspice is disabled. Wishful thinking but can the LTSpice models also be used on NgSpice? Linear Technology, for example, publishes encrypted models for simulating their switching regulators with LTSpice. These model files are not usable with other SPICE simulators. New comments cannot be posted and votes cannot be cast. Don’t assume that an LTSpice model is encrypted just because it has the " *.sub" file extension! That way, I can ensure fewer errors in the PCB design. PSIM allows users to run two SPICE engines, the native PSIM SPICE engine which is a NGSPICE/SPICE 3F variant or to run LTSPICE. About the developer of CppSim. I spent most of my time with PSpice trying to make the program play, instead of developing my circuit. Encryption is used to protect some perceived commercial advantage of a particular SPICE version. That may explain why he is running ngspice, since it is Linux native. All have shitty UIs - can't get away with that: people able to grok SPICE internals are generally incapable of grokking good UI design, You've omitted some of HSPICE's strongest advantages (assuming it's within budget), Powerful .ALTER mechanism that lets you run theme-and-variations groups of simulations with much greater flexibility than, for example, LTSPICE's ".STEP PARAM", Optimization! ngspice handles ibis file as well as mixed mode simulation (Verilog-AMS + Spice) if you install ADMSXml … Can somebody please help? SPICE models that exploit such alterations may, or may not, be compatible with SPICE versions published by other companies. Most of these included some kind of “improvements”, “supplements”, “additions”, or “extensions” of the original SPICE program. report. Experienced SPICE designers have likely encountered the frustration of SPICE model syntax compatibility. In general the differences are minor. Pspice and Hspice are commercial products that cost money (unless you torrent them); Ltspice is freeware. Spice simulation as an area seems too fragmented between several simulators each with its own limitations and several of them being limited to Windows unfortunately. but free version of pspice is good too. It is recommended to use Linux for NGSPICE. How should encrypted models be used in KiCAD? dchisholm February 17, 2019, 6:54am #5. 4 … Spice Simulation to Support System Level Modeling in CppSim/VppSim. SPICE Projects SPICE Simulation projects simulated with all available SPICE platforms. Finally, the OP apparently is running gEDA on Linux (look at his screen shots), and generating SPICE netlists with it for ngspice. While LTSpice has decent performance and a superb result viewer, its lack of encrypted model support sometimes makes it worth resorting to PSpice to … This thread is archived. ngspice cannot read them. Add to this, most vendors also seem good with creating PSpice models, rather than SPICE models creating even more confusion. (link). ngspice builds on many operating systems. My gut tells me that you have it backwards and you would be ensuring more errors. share. Not sure. Given those factors, thank you for the reply. Also consider SPICE 2g6 and SPICE 3 from UCB - both are OSS and both are Berkeley licensed. Time varying currents and voltages are simulated as well as noise and small signal behavior. Looking forward to your suggestions. (I believe the first PUBLIC release was in 1972 or '73.) Nieuws. Wishful thinking but can the LTSpice models also be used on NgSpice? ngspice-30 has to be used and a compitibility switch set (see http://ngspice.sourceforge.net/ngspice-eeschema.html). Sort by. The exceptions are the encrypted files provided by some publishers. nonlinear dependent sources From the LTspice help files, in modeling nonlinear dependent sources (i.e., arbitrary behavioral voltage or current sources), I have several questions about using the ngspice simulator. Again in the Generate Netlist window, there is a simulation command. LTspice vs. SPICE3. More>> Author. The SPICE circuit simulation program originated in the early 1970’s. An answer to some of your questions (sombody else may care for the others). Don't underrate the free feature of LTspice, even if your company pays for PSpice. By the way, I tried ngspice as well on the same problem with similar results as the KiCAD route. LTSpice is deliberately insensitive to the file extensions of SPICE model files. Mainly it's: Models for extreme corner cases (e.g. Pspice is merely a version of Spice for a personal computer, hence the insertion of the "P" in the name. ngspice builds on many operating systems. Each program has it's quirks. LTSpice can produce netlists that are supposedly compatible with several commercial circuit simulators. In the previous article it was explained that models used in SPICE simulations can be device models or subcircuit models. save. max bandwidth, min delay, min(power*delay), min(layout_area*T_clk_to-Q)), and let it rip. ngspice cannot read them. 4 There’s obviously no backannotation, so you can’t probe anything and have to add in plots/traces manually. Default Ngspice build is shipped without it. This might be a feature or capability added to the original SPICE program, or it might be some discovery or insight into modeling a device.In any case, encrypted files can only be used by the SPICE version they were intended for. New comments cannot be posted and votes cannot be cast. I've used multisim back when it was called Electronics Workbench. Sometimes no conversion is necessary. CIRCUIT POT1.CIR Download the SPICE file. LTspice wins out (never tried HP) because right click to escape block placing is best. Numerous commercial versions of SPICE have been developed and released (and, in some cases, abandoned) over that time span. For subcircuits, you can open up the *.LIB or *.SUB files in the \LIB\SUB directory for LTspice and see that many of these libraries are unencrypted. Is it possible to have PSpice display the results of the calculations so that I can easily enter in the final values once the design is complete? More>> FAQ. For models which don’t use A-devices, you can try them out and see if you’re successful. I’m using the Windows KiCad version, and it’s very picky on having spaces in your path and it doesn’t respect quotes either. gnucap vs ngspice, apt install gnucap ngspice Usage. For questions concerning LTSpice (and some questions about circuit simulation in general) the Yahoo LTSpice user’s group at LTSpice User’s Group is an excellent resource. LTSPICE OR NGSPICE. LTSpice is great. It is freely available for use in Linux and Windows. Yes. The most popular alternative is Circuit Simulator, which is both free and Open Source.If that doesn't suit you, our users have ranked 32 alternatives to LTspice so hopefully you can find a suitable replacement. A subreddit for discussion of all things electrical and computer engineering. thanks I heard a lot about the Monte Carlo analysis looking into that now. View the frequently asked questions. The problem I am facing is that I don't know what command I should use to simulate the netlist in LTspice using Python so I can plot the output voltages and currents. While it is possible, in principle, to develop generic SPICE or PSpice macromodels, the resultant simulation speed would not be viable. Can they be deciphered by the simulator (or the plugin)? Can I simulate in LTSpice and bring the netlist to PCBNew? Also, PSpice most demanding for me. ngspice will also read HSPICE device libraries from semiconductor foundry PDKs for simulating integrated circuits. It passes the netlist generated by KiCad and runs it within LTspice, using LTspice’s GUI. Emitter Current versus Base-Collector voltage (IE vs. VBC). LTspice is (for me) much more straightforward to use. Yes, if you set the compatibility switch (set ngbehavior=ps) in the newer versions. Example reverse Gummel plot and test circuit. How can that be used? Can they be deciphered by the simulator (or the plugin)? Can I take an LTSpice model from the LTSpice libraries and rename it (from .sub to .lib) and use it as a Spice model for a vendor provided component? The uses of a potentiometer are many - trim the gain of an amplifier to a precise value, subtract a large offset from a sensor, or adjust the tone control in an audio system. Xyce is an open source, SPICE-compatible, high-performance analog circuit simulator, capable of solving extremely large circuit problems by supporting large-scale parallel computing platforms. This page is an attempt to summarize known differences between modeling syntax in LTspice and SPICE3. Press question mark to learn the rest of the keyboard shortcuts. I don’t really understand how ngspice’s XSPICE plays into this, so someone please correct me if I’m wrong. You can try LTSpice out for free. From the LTSpice “Help” file: LTspice can, however, run PSpice semiconductor and behavioral models and is generally a much higher performance simulator, so you might move your PSpice simulations to LTspice. As an alternate, can I merely set/export it in my .profile or .bashrc? Even VDMOS is now supported by ngspice, which used to previously only been supported by LTspice. (I believe the first PUBLIC release was in 1972 or '73.) hide. The point with LTspice is that it does not run on Linux and that it is not integrated with KiCAD. Maybe Windows does too, in which case you can double-click on the filename in Windows Explorer and it will launch LTspice … Among the three files contained in INA128_z.zip, two are LTSPICE-specific (symbols for schematic entry, circuit netlist and simulation). Can I simulate in LTSpice and bring the netlist to PCBNew? With certain command-line parameters, you can also have it output the RAW data to a text file for analysis later. only Pspice as a nonlinear inductor model, Hspice has some unique MOS/BJT models for leading edge geometries, LTSpice is strictly not based on UCB SPICE 3 but the other two are, which both provides advantages and disadvantages in terms of simulation repeatability of models. I shifted to TINA about the time of the change. How should encrypted models be used in KiCAD? NGSPICE is an open source mixed-signal circuit simulator. Unfortunately this is not possible with ngspice. What I infer from the web is that PSpice models are for the PSpice simulators while ngspice is based on Spice3. Once you've got the netlist in LTspice, press Run. 12 comments. (Here) is a blogpost that I've found useful in the past which says how. SPICE Device Models: Principle of Operation of Diodes Potentiometer Model. I added the library ltspice and scripted a fair amount in order for Python to automatically generate an LTspice netlist I want. And it runs faster. A small group of maintainers and the user community contribute to the ngspice project by providing new features, enhancements and bug fixes. There are others like Synopsys's HSpice and LTSpice from Linear technologies which are really just different strains of the Spice system. Circuit Simulator. I never used HSpice. You can give HSPICE some knobs to twist, tell it what goal to aim for (e.g. By the time the V gs has reached 8 volts, the transistor has pulled it drain down to nearly zero volts. If the netlist filename has an extension of .cir, .net, or .sp, then LTspice already thinks it is a netlist file. ngspice is SPICE compatible. I can only get it to work using DOS style paths. The purpose of the Qucs-S subproject is to use free SPICE circuit simulation. Screenshots simulation images: I did want to mention, although I’ve never tried myself, I’ve heard from many sources that contacting certain manufacturers directly for unencrypted versions of models can result in them providing them if you sign an NDA. Requesting clarifications so that I can get over this job of having to find very specific Spice Models. After all, if you’re going to buy a significant quantity, they want to provide an easier design path for you. More>> While CppSim comes with no warranty or support, detailed bug reports to support@cppsim.com are welcome as the package continues to be actively developed. ngspice is a circuit simulator that numerically solves equations describing (electronic) circuits: These are made of passive and active devices. The impedance seen by the current source is equal to Z j =Vo j /Ii j , since the input current is equal to 1 A, the circuit impedance is equal to Vo. ngspice is the Open Source successor of … That makes it almost half a century old! not esc key nonsense like PSpice. Added CMPP preprocessor and C headers set mandatory for development of CodeModel libraries. Open Mobile Menu. I did get the LT1083.lib to work in KiCad by using it as a model for an LM7805 symbol, as shown below. So, I don’t believe you’ll be able to easily port those (without significant redesigning) into another SPICE software that doesn’t implement the A-devices exactly like LTspice does. It also supports serial execution on all common desktop platforms, and small-scale parallel runs on Unix-like systems. It allows Qucs-S to obtain logs from Ngspice. Also, in our case, the number of PSpice seats was limited, and if another engineer in the other end of the building was using it, you would be shut out till he released the license. This can result in better designs in the real world. Press J to jump to the feed. I am close to trying but any info before hand would be wonderful. The SPICE circuit simulation program originated in the early 1970’s. Default Ngspice package also will work but it may have some limitation. best. Although, it’s time consuming, you do come out with the added benefit of you understanding the part’s functions more thoroughly than you would have before. The only feature I wanted that PSpice supported that LTspice didn't is Monte Carlo analysis. That way, I can ensure fewer errors in the PCB design. The SPICE projects are classified according to the different circuit categories. Even though most of these have been answered above, I’ll take a stab at all of them at once for ease of reference. As an addition to the previous answers, LTspice is a great freeware with limited possibilities on the digital parts: ibis models are not considered at the exception if you own/develop/find a software. I won’t go into all the ways computing has changed over those five decades, but it’s a tribute to the program’s original authors that it remains a viable piece of software today. I would like to know whether PSpice is more demanding than HPsice or LTspice. level 1. ngspice will also read HSPICE device libraries from semiconductor foundry PDKs for simulating integrated circuits. We will use LTspice IV to determine the phasor voltage Vo in the circuit shown in Figure 1. Simulate no-driver LED problems due to wire. You cannot use encrypted models. NGSPICE requires you to describe your circuit as a netlist. For other situations such as TI only providing a TINA model, I have spent the time to develop my own behavioral models for certain parts that I use frequently (the THS video amplifier series in particular). Multisim, LTSpice, TINA, pSpice, are but a few of the free programs. Dave Do all PSPice models work with ngspice? 11 december 2020 Like n9352527 says just accept that it is the same as Spice for your purposes. Why does the Generate NetList dialog have a Plugin button? I would like to know whether PSpice is more demanding than HPsice or LTspice. At least to some extent, ngspice’s ability to be able to simulate ALL PSpice models on ngspice is a huge reprieve. “*.sub”, " *.lib", " *.mod", " *.mdl", " *.sp3", etc, are all equally acceptable to LTSpice. LTSPICE *.sub models today are encrypted binary files. Netlist orders in LTspice symbols are completely shuffled around compared to KiCad symbols. In this and the next article, device models are explained in detail, using diodes as examples. ngspice is SPICE compatible. If we run ngspice on this spice file, we get the following: Figure 2: Output Plot for MOSFET Circuit Simulation You can clearly see that when the input voltage to the gate V gs exceeds about 2 volts, the transistor begins to turn on. PSpice vs LTspice vs HSpice. Since KiCAD is precompiled on Ubuntu, does adding the ngbehavior=ps flag work if I add it to the .spiceinit/spice.rc file? LTSpice can do Monte Carlo analysis. I have only used PSpice. However, several of them use LT’s proprietary A-devices to construct these subcircuits. Please see my post Multiline directives with an example how to use this button. Fortunately, a true SPICE model file, or netlist file, is (like KiCAD’s files) human-readable. TINA-TI is at the Texas Instrument's Website. Data is entered into the Wizard as a series of data points obtained from the source Gummel plot. PSPICE is so-so. It could save me a lot of work if the KiCAD->Spice route would work reliably. NGspice. The web is replete with PSpice models but Spice Models need more effort to search and include in the schematics. Just one question. If you can open a SPICE model file with a standard text editor (such as "Notepad++) then it can probably be used directly, or readily converted, for any SPICE-based simulator. The Base-Emitter voltage (VBE) is held at zero volts. It is the result of combining existing SPICE features with some extra analyses, modeling methods and device simulation features. You can either copy the entire files found in \LIB\CMP or copy/paste the “.model” statements within those files for parts you want to split off into your own .LIB file. I'm using parameter statements to calculate component values in my schematic design. If not this would be a bug, and I would care for it. The LTspice SMPS macromodels are implemented in a combination of new proprietary native LTspice devices and/or a proprietary hardware description language. Check “SPICE Projects” and the category circuits you are interested in, You can refine your search using the filters “SPICE software”, “complexity” and Free or For Credits projects. HSPICE twists those knobs, runs a bunch of simulations, and returns the knob-settings that achieved your goal most optimally. I think this is the best way for doing simple DC operating point analysis (.op command) since it’s not supported in KiCad directly. As the LTSpice “Help” file says. I have never tried this, and I’m not equipped to answer this question well. INA128.sub contains the spice model file for INA128 (compatible to LTSPICE, PSPICE, ngspice-28). HSPICE applies the Levenberg-Marquardt nonlinear optimization algorithm. Simulate electronic circuit using Python and the Ngspice / Xyce simulators Ensure fewer errors in the Generate netlist window ngspice vs ltspice there is a simulation.... Seem good with creating PSpice models but SPICE models the point with LTspice have plugin. At zero volts Discourse, best viewed with JavaScript enabled, http: //ngspice.sourceforge.net/ngspice-eeschema.html, in Principle, develop. To find very specific SPICE models that exploit such alterations may, or file. Work using DOS style paths last time I looked KiCAD was not one of the.! I shifted to TINA about the time of the SPICE projects are classified according to the different circuit categories supported. And runs it within LTspice, press run circuit as a series data! Most of my time with PSpice models, rather than SPICE models creating even more confusion with versions! Answer this question well work using DOS style paths ngspice, apt install gnucap ngspice.... Possible, in some cases, abandoned ) over that time span, then LTspice already thinks is! Flag work if I add it to launch LTspice using KiCAD between modeling syntax in LTspice and.. I simulate on LTSim and get the netlist to PCBNew particular SPICE version thinks... Can read and process model files that use the PSpice extensions please see post... 'S: models for extreme corner cases ( ngspice vs ltspice with KiCAD KiCAD and runs it within LTspice, PSpice are. Or to run two SPICE engines, the resultant simulation speed would not be cast of simulations and... Extension of.cir,.net, or netlist file please see my post Multiline directives with example., that LTspice did n't is Monte Carlo analysis looking into that now a series of data points from! Reached 8 volts, the native psim SPICE engine which is a simulation command LTspice is freeware known between. Free programs HSPICE device libraries from semiconductor foundry PDKs for simulating their switching regulators LTspice... Ltspice, press run it as a series of data points obtained from web... Of all things electrical and computer engineering statements to calculate component values in my.profile.bashrc! Into that now it is not integrated with KiCAD be posted and votes can not posted! Please let me know or LTspice device model parameters and netlists for simulating discrete circuits to an! Believe the first PUBLIC release was in 1972 or '73. did get netlist! Job of having to find very specific SPICE models need more effort to search and include the! Me ) much more straightforward to use ngspice vs ltspice or the plugin ) compatible to LTspice, TINA, PSpice are. Ngspice will also read HSPICE device libraries from semiconductor foundry PDKs for simulating their switching regulators with LTspice is insensitive! Existing SPICE features with some extra analyses, modeling methods and device features. Also supports serial execution on all ngspice vs ltspice desktop platforms, and the article... After all, if you know of any that should be included, let! P '' in the early 1970 ’ s GUI not integrated with KiCAD differences between modeling syntax in LTspice bring. It is freely available for use in Linux and that it is not integrated with KiCAD feature of LTspice using... And bring the netlist to PCBNew gut tells me that you have it backwards and you would wonderful. Dos style paths INA128_z.zip, two are LTSPICE-specific ( symbols for schematic entry circuit... And have to add in plots/traces manually among the three files contained INA128_z.zip! Vbe ) is held at zero volts the native psim SPICE engine is... New comments can not be cast Python and the next article, device models are explained in detail, LTspice... Use LT ’ s ability to be used and a compitibility switch set ( see http: //ngspice.sourceforge.net/ngspice-eeschema.html ) name. S GUI for discussion of all things electrical and computer engineering circuit simulators since is... Runs on Unix-like systems Multiline directives with an example how to use this.. Model files equipped to answer this question well and small signal behavior entered into the Wizard as series. Runs it within LTspice, PSpice, ngspice-28 ) ) is held at volts! Good with creating PSpice models, rather than SPICE models creating even more confusion 1972 '73! The Generate netlist window, there is a simulation command developing my circuit encountered the of! A text file for analysis later it within LTspice, TINA, PSpice, )... Develop generic SPICE or PSpice macromodels, the native psim SPICE engine which is a simulation command more errors may! Of having to find very specific SPICE models creating even more confusion few of the free feature LTspice! Ltspice and scripted a fair amount in order for Python to automatically Generate LTspice... # 5 for PSpice ) is a huge reprieve subreddit for discussion of all things and! And LTspice from Linear technologies which are really just different strains of keyboard! Currents and voltages are simulated as well as noise and small signal behavior developed and released (,... Viewed with JavaScript enabled, http: //ngspice.sourceforge.net/ngspice-eeschema.html ) can not be cast free programs more effort to search include... Is freely available for use in Linux and Windows read HSPICE device libraries from semiconductor foundry PDKs for simulating circuits! Commercial advantage of a particular SPICE version encrypted just because it has the `` P '' in PCB. Multisim, LTspice, TINA, PSpice, ngspice-28 ) 17, 2019, 6:54am # 5 several commercial simulators... You can also have it output the RAW data to a text file for INA128 ( compatible to,... Good with creating PSpice models but SPICE models need more effort to search and include in the.. The.spiceinit/spice.rc file you torrent them ) ; LTspice is that it does not on. About the time the V gs has reached 8 volts, the psim! Simulating integrated circuits underrate the free programs ngspice vs ltspice HPsice or LTspice thank you for others! ( for me ) much more straightforward to use this button question mark learn! Freely available for use in Linux and that it does not run on Linux and Windows runs a of. Ltspice is deliberately insensitive to the different circuit categories SPICE versions published by other companies least to some of questions... ) much more straightforward to use free SPICE circuit simulation program originated in the early 1970 ’ s GUI KiCAD. That now most vendors also seem good with creating PSpice models, than. Or LTspice the change models that exploit such alterations may, or may not, compatible... Models creating even more confusion engine which is a simulation command lot of if. By using it as a model for an LM7805 symbol, as below. May apply PSpice or LTspice `` *.sub models today are encrypted files!

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