level 1. However, several of them use LT’s proprietary A-devices to construct these subcircuits. ngspice is a circuit simulator that numerically solves equations describing (electronic) circuits: These are made of passive and active devices. The Base-Emitter voltage (VBE) is held at zero volts. The LTspice SMPS macromodels are implemented in a combination of new proprietary native LTspice devices and/or a proprietary hardware description language. 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). For basic semiconductor models, yes. CIRCUIT POT1.CIR Download the SPICE file. Default Ngspice build is shipped without it. nonlinear dependent sources From the LTspice help files, in modeling nonlinear dependent sources (i.e., arbitrary behavioral voltage or current sources), hide. 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. 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 you know of any that should be included, please let me know. You can try LTSpice out for free. ngspice handles ibis file as well as mixed mode simulation (Verilog-AMS + Spice) if you install ADMSXml … It is the result of combining existing SPICE features with some extra analyses, modeling methods and device simulation features. ngspice cannot read them. Requesting clarifications so that I can get over this job of having to find very specific Spice Models. I never noticed it until you mentioned it. It could save me a lot of work if the KiCAD->Spice route would work reliably. More>> Author. PSIM allows users to run two SPICE engines, the native PSIM SPICE engine which is a NGSPICE/SPICE 3F variant or to run LTSPICE. thanks I heard a lot about the Monte Carlo analysis looking into that now. 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. Linear Technology, for example, publishes encrypted models for simulating their switching regulators with LTSpice. Why does the Generate NetList dialog have a Plugin button? 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? SPICE models that exploit such alterations may, or may not, be compatible with SPICE versions published by other companies. Or alternatively, can I simulate on LTSim and get the netlist to PcbNew? Given those factors, thank you for the reply. Don't underrate the free feature of LTspice, even if your company pays for PSpice. LTSpice can do Monte Carlo analysis. And it runs faster. 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. LTspice vs. SPICE3. Also consider SPICE 2g6 and SPICE 3 from UCB - both are OSS and both are Berkeley licensed. Sometimes no conversion is necessary. If the netlist filename has an extension of .cir, .net, or .sp, then LTspice already thinks it is a netlist file. LTSPICE *.sub models today are encrypted binary files. 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. Can they be deciphered by the simulator (or the plugin)? Pspice is merely a version of Spice for a personal computer, hence the insertion of the "P" in the name. Screenshots simulation images: Add to this, most vendors also seem good with creating PSpice models, rather than SPICE models creating even more confusion. Yes, if you set the compatibility switch (set ngbehavior=ps) in the newer versions. Encryption is used to protect some perceived commercial advantage of a particular SPICE version. ngspice will also read HSPICE device libraries from semiconductor foundry PDKs for simulating integrated circuits. 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. An answer to some of your questions (sombody else may care for the others). ngspice will also read HSPICE device libraries from semiconductor foundry PDKs for simulating integrated circuits. Even VDMOS is now supported by ngspice, which used to previously only been supported by LTspice. Experienced SPICE designers have likely encountered the frustration of SPICE model syntax compatibility. best. With certain command-line parameters, you can also have it output the RAW data to a text file for analysis later. INA128.sub contains the spice model file for INA128 (compatible to LTSPICE, PSPICE, ngspice-28). ltspice vs pspice. 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 … You may apply PSPICE or LTSPICE device model parameters and netlists for simulating discrete circuits. NGSPICE requires you to describe your circuit as a netlist. LTSpice is great. Nieuws. Looking forward to your suggestions. New comments cannot be posted and votes cannot be cast. The SPICE projects are classified according to the different circuit categories. ngspice is the Open Source successor of … PSpice vs LTspice vs HSpice. (I believe the first PUBLIC release was in 1972 or '73.) 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. If not this would be a bug, and I would care for it. 4 Added CMPP preprocessor and C headers set mandatory for development of CodeModel libraries. Dave 11 december 2020 Again in the Generate Netlist window, there is a simulation command. TINA-TI is at the Texas Instrument's Website. In this and the next article, device models are explained in detail, using diodes as examples. Data is entered into the Wizard as a series of data points obtained from the source Gummel plot. Unfortunately this is not possible with ngspice. Just one question. HSPICE twists those knobs, runs a bunch of simulations, and returns the knob-settings that achieved your goal most optimally. I spent most of my time with PSpice trying to make the program play, instead of developing my circuit. save. 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 recommended to use Linux for NGSPICE. gnucap vs ngspice, apt install gnucap ngspice Usage. I can only get it to work using DOS style paths. It allows Qucs-S to obtain logs from Ngspice. I did get the LT1083.lib to work in KiCad by using it as a model for an LM7805 symbol, as shown below. Figure 16. max bandwidth, min delay, min(power*delay), min(layout_area*T_clk_to-Q)), and let it rip. Default Ngspice package also will work but it may have some limitation. Please see my post Multiline directives with an example how to use this button. The purpose of the Qucs-S subproject is to use free SPICE circuit simulation. 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. 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? 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. NGspice. (I believe the first PUBLIC release was in 1972 or '73.) ngspice is SPICE compatible. Also, PSpice most demanding for me. Fortunately, a true SPICE model file, or netlist file, is (like KiCAD’s files) human-readable. (link). Can I simulate in LTSpice and bring the netlist to PCBNew? Numerous commercial versions of SPICE have been developed and released (and, in some cases, abandoned) over that time span. View the frequently asked questions. ngspice cannot read them. 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. 83% Upvoted. Mainly it's: Models for extreme corner cases (e.g. Can I simulate in LTSpice and bring the netlist to PCBNew? 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 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. That way, I can ensure fewer errors in the PCB design. 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. LTSpice is deliberately insensitive to the file extensions of SPICE model files. Press question mark to learn the rest of the keyboard shortcuts. Spice Simulation to Support System Level Modeling in CppSim/VppSim. While it is possible, in principle, to develop generic SPICE or PSpice macromodels, the resultant simulation speed would not be viable. Simulate electronic circuit using Python and the Ngspice / Xyce simulators New comments cannot be posted and votes cannot be cast. You can give HSPICE some knobs to twist, tell it what goal to aim for (e.g. How can that be used? I believe, for example, that LTSpice can read and process model files that use the PSPICE extensions. You may apply PSPICE or LTSPICE device model parameters and netlists for simulating discrete circuits. Multisim, LTSpice, TINA, pSpice, are but a few of the free programs. As an alternate, can I merely set/export it in my .profile or .bashrc? I have only used PSpice. A small group of maintainers and the user community contribute to the ngspice project by providing new features, enhancements and bug fixes. I'm using parameter statements to calculate component values in my schematic design. 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. About the developer of CppSim. In general the differences are minor. 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. As the LTSpice “Help” file says. This page is an attempt to summarize known differences between modeling syntax in LTspice and SPICE3. not esc key nonsense like PSpice. 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. Wishful thinking but can the LTSpice models also be used on NgSpice? 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. Maybe Windows does too, in which case you can double-click on the filename in Windows Explorer and it will launch LTspice … Can somebody please help? Open Source LTspice Alternatives. report. Wishful thinking but can the LTSpice models also be used on NgSpice? This thread is archived. This can result in better designs in the real world. I have only used PSpice. By the time the V gs has reached 8 volts, the transistor has pulled it drain down to nearly zero volts. 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