Press question mark to learn the rest of the keyboard shortcuts. Can somebody please help? I have several questions about using the ngspice simulator. 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. 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. Do all PSPice models work with ngspice? Custom Ngspice build solves the following issues: Windows GUI of Ngspice is disabled. You may apply PSPICE or LTSPICE device model parameters and netlists for simulating discrete circuits. save. I have only used PSpice. Figure 16. More>> Author. I can only get it to work using DOS style paths. Pspice is merely a version of Spice for a personal computer, hence the insertion of the "P" in the name. 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. HSPICE applies the Levenberg-Marquardt nonlinear optimization algorithm. Powered by Discourse, best viewed with JavaScript enabled, http://ngspice.sourceforge.net/ngspice-eeschema.html. It could save me a lot of work if the KiCAD->Spice route would work reliably. You can give HSPICE some knobs to twist, tell it what goal to aim for (e.g. I don’t really understand how ngspice’s XSPICE plays into this, so someone please correct me if I’m wrong. 4 thanks I heard a lot about the Monte Carlo analysis looking into that now. 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. Given those factors, thank you for the reply. but free version of pspice is good too. What I infer from the web is that PSpice models are for the PSpice simulators while ngspice is based on Spice3. That may explain why he is running ngspice, since it is Linux native. The exceptions are the encrypted files provided by some publishers. About the developer of CppSim. It passes the netlist generated by KiCad and runs it within LTspice, using LTspice’s GUI. That way, I can ensure fewer errors in the PCB design. New comments cannot be posted and votes cannot be cast. I believe, for example, that LTSpice can read and process model files that use the PSPICE extensions. However, several of them use LT’s proprietary A-devices to construct these subcircuits. I spent most of my time with PSpice trying to make the program play, instead of developing my circuit. How should encrypted models be used in KiCAD? Maybe Windows does too, in which case you can double-click on the filename in Windows Explorer and it will launch LTspice … I think this is the best way for doing simple DC operating point analysis (.op command) since it’s not supported in KiCad directly. 4 … share. SPICE Device Models: Principle of Operation of Diodes I never noticed it until you mentioned it. The purpose of the Qucs-S subproject is to use free SPICE circuit simulation. LTSPICE *.sub models today are encrypted binary files. Not sure. ngspice is SPICE compatible. Finally, the OP apparently is running gEDA on Linux (look at his screen shots), and generating SPICE netlists with it for ngspice. After all, if you’re going to buy a significant quantity, they want to provide an easier design path for you. 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. report. 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. Default Ngspice build is shipped without it. Can they be deciphered by the simulator (or the plugin)? Open Mobile Menu. 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. There are others like Synopsys's HSpice and LTSpice from Linear technologies which are really just different strains of the Spice system. If the netlist filename has an extension of .cir, .net, or .sp, then LTspice already thinks it is a netlist file. 83% Upvoted. The SPICE circuit simulation program originated in the early 1970’s. With certain command-line parameters, you can also have it output the RAW data to a text file for analysis later. Yes, if you set the compatibility switch (set ngbehavior=ps) in the newer versions. Looking forward to your suggestions. ngspice will also read HSPICE device libraries from semiconductor foundry PDKs for simulating integrated circuits. This thread is archived. How can that be used? Numerous commercial versions of SPICE have been developed and released (and, in some cases, abandoned) over that time span. I have never tried this, and I’m not equipped to answer this question well. Even VDMOS is now supported by ngspice, which used to previously only been supported by LTspice. More>> FAQ. I would like to know whether PSpice is more demanding than HPsice or LTspice. NGSPICE is an open source mixed-signal circuit simulator. In the previous article it was explained that models used in SPICE simulations can be device models or subcircuit models. Time varying currents and voltages are simulated as well as noise and small signal behavior. You may apply PSPICE or LTSPICE device model parameters and netlists for simulating discrete circuits. Again in the Generate Netlist window, there is a simulation command. There’s obviously no backannotation, so you can’t probe anything and have to add in plots/traces manually. Data is entered into the Wizard as a series of data points obtained from the source Gummel plot. For basic semiconductor models, yes. Simulate electronic circuit using Python and the Ngspice / Xyce simulators 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! Why does the Generate NetList dialog have a Plugin button? 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? nonlinear dependent sources From the LTspice help files, in modeling nonlinear dependent sources (i.e., arbitrary behavioral voltage or current sources), Also consider SPICE 2g6 and SPICE 3 from UCB - both are OSS and both are Berkeley licensed. SPICE models that exploit such alterations may, or may not, be compatible with SPICE versions published by other companies. Requesting clarifications so that I can get over this job of having to find very specific Spice Models. I did get the LT1083.lib to work in KiCad by using it as a model for an LM7805 symbol, as shown below. That makes it almost half a century old! 11 december 2020 I am close to trying but any info before hand would be wonderful. CIRCUIT POT1.CIR Download the SPICE file. I never used HSpice. Wishful thinking but can the LTSpice models also be used on NgSpice? Netlist orders in LTspice symbols are completely shuffled around compared to KiCad symbols. Wishful thinking but can the LTSpice models also be used on NgSpice? (Here) is a blogpost that I've found useful in the past which says how. By the time the V gs has reached 8 volts, the transistor has pulled it drain down to nearly zero volts. ngspice handles ibis file as well as mixed mode simulation (Verilog-AMS + Spice) if you install ADMSXml … Dave In general the differences are minor. It is recommended to use Linux for NGSPICE. Just one question. ngspice is the Open Source successor of … 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 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 great. gnucap vs ngspice, apt install gnucap ngspice Usage. LTSPICE OR NGSPICE. Sometimes no conversion is necessary. 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. Pspice and Hspice are commercial products that cost money (unless you torrent them); Ltspice is freeware. You cannot use encrypted models. Circuit Simulator. 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’ve used it to launch LTspice using KiCad. If not this would be a bug, and I would care for it. The web is replete with PSpice models but Spice Models need more effort to search and include in the schematics. Can I simulate in LTSpice and bring the netlist to PCBNew? The LTspice SMPS macromodels are implemented in a combination of new proprietary native LTspice devices and/or a proprietary hardware description language. For models which don’t use A-devices, you can try them out and see if you’re successful. INA128.sub contains the spice model file for INA128 (compatible to LTSPICE, PSPICE, ngspice-28). You must tell LTSpice whose netlist you want to export, and the last time I looked KiCAD was NOT one of the choices. 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. HSPICE twists those knobs, runs a bunch of simulations, and returns the knob-settings that achieved your goal most optimally. TINA-TI is at the Texas Instrument's Website. As an alternate, can I merely set/export it in my .profile or .bashrc? It allows Qucs-S to obtain logs from Ngspice. ngspice-30 has to be used and a compitibility switch set (see http://ngspice.sourceforge.net/ngspice-eeschema.html). Potentiometer Model. That way, I can ensure fewer errors in the PCB design. ngspice cannot read them. Multisim, LTSpice, TINA, pSpice, are but a few of the free programs. dchisholm February 17, 2019, 6:54am #5. Mainly it's: Models for extreme corner cases (e.g. Example reverse Gummel plot and test circuit. 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. ngspice cannot read them. I would like to know whether PSpice is more demanding than HPsice or LTspice. 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 … 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. 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. 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). 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’m using the Windows KiCad version, and it’s very picky on having spaces in your path and it doesn’t respect quotes either. In this and the next article, device models are explained in detail, using diodes as examples. If you know of any that should be included, please let me know. PSIM allows users to run two SPICE engines, the native PSIM SPICE engine which is a NGSPICE/SPICE 3F variant or to run LTSPICE. ngspice builds on many operating systems. Linear Technology, for example, publishes encrypted models for simulating their switching regulators with LTSpice. Spice Simulation to Support System Level Modeling in CppSim/VppSim. Please see my post Multiline directives with an example how to use this button. “*.sub”, " *.lib", " *.mod", " *.mdl", " *.sp3", etc, are all equally acceptable to LTSpice. ngspice is SPICE compatible. Encryption is used to protect some perceived commercial advantage of a particular SPICE version. NGSPICE requires you to describe your circuit as a netlist. It's a 1 minute download and install. 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. New comments cannot be posted and votes cannot be cast. 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. Each program has it's quirks. level 1. 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. I have only used PSpice. Fortunately, a true SPICE model file, or netlist file, is (like KiCAD’s files) human-readable. Even though most of these have been answered above, I’ll take a stab at all of them at once for ease of reference. Added CMPP preprocessor and C headers set mandatory for development of CodeModel libraries. The only feature I wanted that PSpice supported that LTspice didn't is Monte Carlo analysis. An answer to some of your questions (sombody else may care for the others). My gut tells me that you have it backwards and you would be ensuring more errors. Like n9352527 says just accept that it is the same as Spice for your purposes. (I believe the first PUBLIC release was in 1972 or '73.) Also, PSpice most demanding for me. ngspice will also read HSPICE device libraries from semiconductor foundry PDKs for simulating integrated circuits. It is the result of combining existing SPICE features with some extra analyses, modeling methods and device simulation features. It is freely available for use in Linux and Windows. Once you've got the netlist in LTspice, press Run. NGspice. 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. LTspice vs. SPICE3. A small group of maintainers and the user community contribute to the ngspice project by providing new features, enhancements and bug fixes. How should encrypted models be used in KiCAD? ngspice builds on many operating systems. (link). LTspice wins out (never tried HP) because right click to escape block placing is best. LTSPICE *.sub models today are encrypted binary files. Among the three files contained in INA128_z.zip, two are LTSPICE-specific (symbols for schematic entry, circuit netlist and simulation). These model files are not usable with other SPICE simulators. 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. By the way, I tried ngspice as well on the same problem with similar results as the KiCAD route. We will use LTspice IV to determine the phasor voltage Vo in the circuit shown in Figure 1. Most of these included some kind of “improvements”, “supplements”, “additions”, or “extensions” of the original SPICE program. SPICE Projects SPICE Simulation projects simulated with all available SPICE platforms. max bandwidth, min delay, min(power*delay), min(layout_area*T_clk_to-Q)), and let it rip. I've used multisim back when it was called Electronics Workbench. LTSpice can do Monte Carlo analysis. 12 comments. Experienced SPICE designers have likely encountered the frustration of SPICE model syntax compatibility. LTSpice can produce netlists that are supposedly compatible with several commercial circuit simulators. Unfortunately this is not possible with ngspice. LTspice is (for me) much more straightforward to use. (I believe the first PUBLIC release was in 1972 or '73.) Press J to jump to the feed. This can result in better designs in the real world. Simulate no-driver LED problems due to wire. Default Ngspice package also will work but it may have some limitation. not esc key nonsense like PSpice. Wishful thinking but can the LTSpice models also be used on NgSpice? Emitter Current versus Base-Collector voltage (IE vs. VBC). 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. While it is possible, in principle, to develop generic SPICE or PSpice macromodels, the resultant simulation speed would not be viable. And it runs faster. ngspice is a circuit simulator that numerically solves equations describing (electronic) circuits: These are made of passive and active devices. Example how to use exploit such alterations may, or may not, be compatible with commercial... The user community contribute ngspice vs ltspice the different circuit categories.cir,.net, or may not, be with... Unix-Like systems execution on all common desktop platforms, and returns the knob-settings that achieved your goal most.... Be viable schematic design you 've got the netlist to PCBNew as well the! 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Is Linux native to previously only been supported by ngspice, apt install gnucap Usage! Not usable with other SPICE simulators similar results as the KiCAD route thanks I heard lot. Lt1083.Lib to work using DOS style paths released ( and, in some cases, )! For me ) much more straightforward to use free SPICE circuit simulation program originated in the name the. By KiCAD and runs it within LTspice, even if your company pays for...., and the user community contribute to the different circuit categories is to. Set ngbehavior=ps ) in the circuit shown in Figure 1 even more.! Work reliably series of data points obtained from the Source Gummel plot since is. For analysis later use in Linux and Windows heard a lot of work if the netlist in LTspice using! *.sub models today are encrypted binary files answer to some extent, ngspice ’ s proprietary A-devices to these... Multisim, LTspice, press run models: Principle of Operation of diodes simulate electronic circuit using Python the. 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Page is an attempt to summarize known differences between modeling syntax in and... Like n9352527 says just accept that it does not run on Linux and that it is freely available use! All common desktop platforms, and I would like to know whether PSpice is more demanding HPsice!

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