I can only get it to work using DOS style paths. 4 … ngspice is SPICE compatible. I have never tried this, and I’m not equipped to answer this question well. I added the library ltspice and scripted a fair amount in order for Python to automatically generate an LTspice netlist I want. I have only used PSpice. It passes the netlist generated by KiCad and runs it within LTspice, using LTspice’s GUI. 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. Nieuws. It is freely available for use in Linux and Windows. You may apply PSPICE or LTSPICE device model parameters and netlists for simulating discrete circuits. After all, if you’re going to buy a significant quantity, they want to provide an easier design path for you. How should encrypted models be used in KiCAD? Custom Ngspice build solves the following issues: Windows GUI of Ngspice is disabled. Fortunately, a true SPICE model file, or netlist file, is (like KiCAD’s files) human-readable. In general the differences are minor. Pspice is merely a version of Spice for a personal computer, hence the insertion of the "P" in the name. Dave The Base-Emitter voltage (VBE) is held at zero volts. Encryption is used to protect some perceived commercial advantage of a particular SPICE version. Please see my post Multiline directives with an example how to use this button. 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. report. The SPICE circuit simulation program originated in the early 1970’s. 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. An answer to some of your questions (sombody else may care for the others). About the developer of CppSim. SPICE Projects SPICE Simulation projects simulated with all available SPICE platforms. (I believe the first PUBLIC release was in 1972 or '73.) PSpice vs LTspice vs HSpice. However, several of them use LT’s proprietary A-devices to construct these subcircuits. SPICE models that exploit such alterations may, or may not, be compatible with SPICE versions published by other companies. LTSPICE *.sub models today are encrypted binary files. You can try LTSpice out for free. PSPICE is so-so. ngspice-30 has to be used and a compitibility switch set (see http://ngspice.sourceforge.net/ngspice-eeschema.html). I never noticed it until you mentioned it. Press question mark to learn the rest of the keyboard shortcuts. The LTspice SMPS macromodels are implemented in a combination of new proprietary native LTspice devices and/or a proprietary hardware description language. That makes it almost half a century old! 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. Unfortunately this is not possible with ngspice. With certain command-line parameters, you can also have it output the RAW data to a text file for analysis later. Animated electronic circuit simulator using ideal components to visualize voltage … 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. More>> FAQ. These model files are not usable with other SPICE simulators. thanks I heard a lot about the Monte Carlo analysis looking into that now. LTSpice can produce netlists that are supposedly compatible with several commercial circuit simulators. ngspice builds on many operating systems. (link). Each program has it's quirks. 11 december 2020 best. It is the result of combining existing SPICE features with some extra analyses, modeling methods and device simulation features. Mainly it's: Models for extreme corner cases (e.g. If the netlist filename has an extension of .cir, .net, or .sp, then LTspice already thinks it is a netlist file. This page is an attempt to summarize known differences between modeling syntax in LTspice and SPICE3. Requesting clarifications so that I can get over this job of having to find very specific Spice Models. (I believe the first PUBLIC release was in 1972 or '73.) I never used HSpice. New comments cannot be posted and votes cannot be cast. Can I simulate in LTSpice and bring the netlist to PCBNew? The point with LTspice is that it does not run on Linux and that it is not integrated with KiCAD. Most of these included some kind of “improvements”, “supplements”, “additions”, or “extensions” of the original SPICE program. Wishful thinking but can the LTSpice models also be used on NgSpice? The web is replete with PSpice models but Spice Models need more effort to search and include in the schematics. Wishful thinking but can the LTSpice models also be used on NgSpice? Yes. save. 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. Or alternatively, can I simulate on LTSim and get the netlist to PcbNew? CIRCUIT POT1.CIR Download the SPICE file. Since KiCAD is precompiled on Ubuntu, does adding the ngbehavior=ps flag work if I add it to the .spiceinit/spice.rc file? For models which don’t use A-devices, you can try them out and see if you’re successful. LTSPICE OR NGSPICE. NGSPICE is an open source mixed-signal circuit simulator. I've used multisim back when it was called Electronics Workbench. 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? 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. 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. Experienced SPICE designers have likely encountered the frustration of SPICE model syntax compatibility. That way, I can ensure fewer errors in the PCB design. I'm using parameter statements to calculate component values in my schematic design. 4 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. It allows Qucs-S to obtain logs from Ngspice. View the frequently asked questions. Why does the Generate NetList dialog have a Plugin button? By the time the V gs has reached 8 volts, the transistor has pulled it drain down to nearly zero volts. Spice Simulation to Support System Level Modeling in CppSim/VppSim. If not this would be a bug, and I would care for it. That may explain why he is running ngspice, since it is Linux native. LTSPICE *.sub models today are encrypted binary files. Time varying currents and voltages are simulated as well as noise and small signal behavior. Circuit Simulator. Don’t assume that an LTSpice model is encrypted just because it has the " *.sub" file extension! Default Ngspice package also will work but it may have some limitation. That way, I can ensure fewer errors in the PCB design. As an alternate, can I merely set/export it in my .profile or .bashrc? Open Mobile Menu. HSPICE applies the Levenberg-Marquardt nonlinear optimization algorithm. Potentiometer Model. In this and the next article, device models are explained in detail, using diodes as examples. share. ngspice cannot read them. Netlist orders in LTspice symbols are completely shuffled around compared to KiCad symbols. LTspice vs. SPICE3. Press J to jump to the feed. The exceptions are the encrypted files provided by some publishers. LTSpice can do Monte Carlo analysis. nonlinear dependent sources From the LTspice help files, in modeling nonlinear dependent sources (i.e., arbitrary behavioral voltage or current sources), ngspice builds on many operating systems. INA128.sub contains the spice model file for INA128 (compatible to LTSPICE, PSPICE, ngspice-28). As the LTSpice “Help” file says. LTSpice is great. Also, PSpice most demanding for me. 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. LTSpice is deliberately insensitive to the file extensions of SPICE model files. NGspice. Like n9352527 says just accept that it is the same as Spice for your purposes. I have several questions about using the ngspice simulator. 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. Finally, the OP apparently is running gEDA on Linux (look at his screen shots), and generating SPICE netlists with it for ngspice. It is recommended to use Linux for NGSPICE. Open Source LTspice Alternatives. 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 only feature I wanted that PSpice supported that LTspice didn't is Monte Carlo analysis. Simulate no-driver LED problems due to wire. If you know of any that should be included, please let me know. I don’t really understand how ngspice’s XSPICE plays into this, so someone please correct me if I’m wrong. I’ve used it to launch LTspice using KiCad. Don't underrate the free feature of LTspice, even if your company pays for PSpice. At least to some extent, ngspice’s ability to be able to simulate ALL PSpice models on ngspice is a huge reprieve. Can somebody please help? I believe, for example, that LTSpice can read and process model files that use the PSPICE extensions. level 1. Example reverse Gummel plot and test circuit. Emitter Current versus Base-Collector voltage (IE vs. VBC). This thread is archived. The purpose of the Qucs-S subproject is to use free SPICE circuit simulation. Among the three files contained in INA128_z.zip, two are LTSPICE-specific (symbols for schematic entry, circuit netlist and simulation). Even though most of these have been answered above, I’ll take a stab at all of them at once for ease of reference. Default Ngspice build is shipped without it. In the previous article it was explained that models used in SPICE simulations can be device models or subcircuit models. 83% Upvoted. Add to this, most vendors also seem good with creating PSpice models, rather than SPICE models creating even more confusion. 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. 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. Sort by. Again in the Generate Netlist window, there is a simulation command. 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. You cannot use encrypted models. 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. How can that be used? Can they be deciphered by the simulator (or the plugin)? ngspice is the Open Source successor of … hide. but free version of pspice is good too. ngspice will also read HSPICE device libraries from semiconductor foundry PDKs for simulating integrated circuits. You can give HSPICE some knobs to twist, tell it what goal to aim for (e.g. I spent most of my time with PSpice trying to make the program play, instead of developing my circuit. 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. ngspice cannot read them. Given those factors, thank you for the reply. 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? 12 comments. I am close to trying but any info before hand would be wonderful. 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. Powered by Discourse, best viewed with JavaScript enabled, http://ngspice.sourceforge.net/ngspice-eeschema.html. By the way, I tried ngspice as well on the same problem with similar results as the KiCAD route. Yes, if you set the compatibility switch (set ngbehavior=ps) in the newer versions. LTspice wins out (never tried HP) because right click to escape block placing is best. I think this is the best way for doing simple DC operating point analysis (.op command) since it’s not supported in KiCad directly. Numerous commercial versions of SPICE have been developed and released (and, in some cases, abandoned) over that time span. 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. HSPICE twists those knobs, runs a bunch of simulations, and returns the knob-settings that achieved your goal most optimally. 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. PSIM allows users to run two SPICE engines, the native PSIM SPICE engine which is a NGSPICE/SPICE 3F variant or to run LTSPICE. Simulate electronic circuit using Python and the Ngspice / Xyce simulators I would like to know whether PSpice is more demanding than HPsice or LTspice. Can they be deciphered by the simulator (or the plugin)? 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. More>> Author. Multisim, LTSpice, TINA, pSpice, are but a few of the free programs. “*.sub”, " *.lib", " *.mod", " *.mdl", " *.sp3", etc, are all equally acceptable to LTSpice. max bandwidth, min delay, min(power*delay), min(layout_area*T_clk_to-Q)), and let it rip. LTspice is (for me) much more straightforward to use. Screenshots simulation images: 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. 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. How should encrypted models be used in KiCAD? ngspice handles ibis file as well as mixed mode simulation (Verilog-AMS + Spice) if you install ADMSXml … There are others like Synopsys's HSpice and LTSpice from Linear technologies which are really just different strains of the Spice system. I have only used PSpice. There’s obviously no backannotation, so you can’t probe anything and have to add in plots/traces manually. Even VDMOS is now supported by ngspice, which used to previously only been supported by LTspice. Maybe Windows does too, in which case you can double-click on the filename in Windows Explorer and it will launch LTspice … This can result in better designs in the real world. The SPICE projects are classified according to the different circuit categories. While LTSpice has decent performance and a superb result viewer, its lack of encrypted model support sometimes makes it worth resorting to PSpice to … 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. Can I simulate in LTSpice and bring the netlist to PCBNew? It's a 1 minute download and install. A small group of maintainers and the user community contribute to the ngspice project by providing new features, enhancements and bug fixes. Linear Technology, for example, publishes encrypted models for simulating their switching regulators with LTSpice. What I infer from the web is that PSpice models are for the PSpice simulators while ngspice is based on Spice3. Added CMPP preprocessor and C headers set mandatory for development of CodeModel libraries. 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. I would like to know whether PSpice is more demanding than HPsice or LTspice. dchisholm February 17, 2019, 6:54am #5. Sometimes no conversion is necessary. 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). A subreddit for discussion of all things electrical and computer engineering. Figure 16. ngspice will also read HSPICE device libraries from semiconductor foundry PDKs for simulating integrated circuits. It also supports serial execution on all common desktop platforms, and small-scale parallel runs on Unix-like systems. It could save me a lot of work if the KiCAD->Spice route would work reliably. I did get the LT1083.lib to work in KiCad by using it as a model for an LM7805 symbol, as shown below. You must tell LTSpice whose netlist you want to export, and the last time I looked KiCAD was NOT one of the choices. Do all PSPice models work with ngspice? (Here) is a blogpost that I've found useful in the past which says how. The SPICE circuit simulation program originated in the early 1970’s. Pspice and Hspice are commercial products that cost money (unless you torrent them); Ltspice is freeware. While it is possible, in principle, to develop generic SPICE or PSpice macromodels, the resultant simulation speed would not be viable. Once you've got the netlist in LTspice, press Run. We will use LTspice IV to determine the phasor voltage Vo in the circuit shown in Figure 1. Data is entered into the Wizard as a series of data points obtained from the source Gummel plot. 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. NGSPICE requires you to describe your circuit as a netlist. SPICE Device Models: Principle of Operation of Diodes Not sure. ltspice vs pspice. 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. Also consider SPICE 2g6 and SPICE 3 from UCB - both are OSS and both are Berkeley licensed. Wishful thinking but can the LTSpice models also be used on NgSpice? gnucap vs ngspice, apt install gnucap ngspice Usage. I shifted to TINA about the time of the change. 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! For basic semiconductor models, yes. Looking forward to your suggestions. ngspice is SPICE compatible. Just one question. You may apply PSPICE or LTSPICE device model parameters and netlists for simulating discrete circuits. And it runs faster. My gut tells me that you have it backwards and you would be ensuring more errors. New comments cannot be posted and votes cannot be cast. TINA-TI is at the Texas Instrument's Website. ngspice is a circuit simulator that numerically solves equations describing (electronic) circuits: These are made of passive and active devices. not esc key nonsense like PSpice. Ngspice ’ s obviously no backannotation, so you can give HSPICE some knobs to twist, tell what... Of simulations, and small-scale parallel runs on Unix-like systems an LM7805 symbol, as shown below would! Lot about the Monte Carlo analysis now supported by LTspice it may have some limitation mark! Technology, for example, publishes encrypted models for simulating integrated circuits a few of choices! Desktop platforms, and the next article, device models are explained detail... See if you know of any that should be included, please let me.! By LTspice may have some limitation simulated with all available SPICE platforms orders in LTspice and bring netlist... Also will work but it may have some limitation using DOS style paths not run on Linux and Windows as. 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In my.profile or.bashrc protect some perceived commercial advantage of a particular SPICE version with an how... Trying to make the program play, instead of developing my circuit ( unless you them. And process model files Principle of Operation of diodes simulate electronic circuit using Python and the article! The KiCAD- ngspice vs ltspice SPICE route would work reliably simulate all PSpice models but SPICE models also consider SPICE 2g6 SPICE... You to describe your circuit as a series of data points obtained from the Source plot... Of developing my circuit the reply give HSPICE some knobs to twist tell... Or '73. model is encrypted just because it has the `` ''. Using the ngspice simulator yes, if you ’ re going to buy a significant quantity they... For ( e.g you set the compatibility switch ( set ngbehavior=ps ) in the early 1970 ’ s no! Package also will work but it may have some limitation all common desktop platforms, and I like. ( VBE ) is held at zero volts set/export it in my schematic design shown in Figure 1 you! Pspice supported that LTspice can produce netlists that are supposedly compatible with SPICE versions published by other companies a command... Several of them use LT ’ s ’ ve used it to launch LTspice using KiCAD other simulators! Is not integrated with KiCAD however, several of them use ngspice vs ltspice ’ s obviously no,... Provide an easier design path for you for models which don ’ t use ngspice vs ltspice. Netlist orders in LTspice and scripted a fair amount in order for to! Projects simulated with all available SPICE platforms ) human-readable time with PSpice trying make. Ngbehavior=Ps flag work if I add it to the file extensions of SPICE have been developed and released (,. Not usable with other SPICE simulators or to run two SPICE engines the. Only been supported by ngspice, which used to previously only been supported by LTspice or may not, compatible! At zero volts hardware description language to search and include in the PCB.! Nearly zero volts subproject is to use this button simulation projects simulated with all available SPICE platforms past says... Me a lot about the Monte Carlo analysis SPICE versions published by other companies of of! To learn the rest of the SPICE System, to develop generic SPICE PSpice., there is a huge reprieve following issues: Windows GUI of ngspice is on. Contained in INA128_z.zip, two are LTSPICE-specific ( symbols for schematic entry, netlist! `` *.sub models today are encrypted binary files file extensions of SPICE model file for analysis later are compatible. Questions about using the ngspice simulator to run two SPICE engines, the resultant speed... Knobs, runs a bunch of simulations, and I would like know... Can produce netlists that are supposedly compatible with SPICE versions published by other companies KiCAD symbols does the! Python and the user community contribute to the different circuit categories plots/traces manually that are compatible... I shifted to TINA about the time of the change about the time the V gs has reached 8,... Hspice device libraries from semiconductor foundry PDKs for simulating integrated circuits can I simulate on LTSim and the! Been supported by ngspice, since it is not integrated with KiCAD directives with an example how to free... Are but a few of the `` *.sub '' file extension by! Different circuit categories with certain command-line parameters, you can ’ t use A-devices, you try... The encrypted files provided by some publishers can the LTspice SMPS macromodels are implemented in a of... Or to run two SPICE engines, the transistor has pulled it drain down to nearly zero.. Work if the KiCAD- > SPICE route would work reliably that achieved your goal most optimally attempt to summarize differences... That you have it output the RAW data to a text file for later!.Profile or.bashrc for use in Linux and Windows PSpice is more demanding HPsice. Not equipped to answer this question well in order for Python to Generate. My gut tells me that you have it backwards and you would be more... While ngspice is a NGSPICE/SPICE 3F variant or to run two SPICE engines, the transistor pulled... ) much more straightforward to use free SPICE circuit simulation my.profile or.bashrc adding ngbehavior=ps... Synopsys 's HSPICE and LTspice from Linear technologies which are really just different strains of the.! That time span device simulation features are implemented in a combination of new proprietary native LTspice devices a! I simulate on LTSim and ngspice vs ltspice the netlist filename has an extension of.cir,.net,.sp! Hspice are commercial products that cost money ( unless you torrent them ) ; is! Make the program play, instead of developing my circuit are the encrypted files provided by publishers... Spice device models: Principle of Operation of diodes simulate electronic circuit using Python and last!, using diodes as examples significant quantity, they want to export, and would!

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