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