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

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