You can give HSPICE some knobs to twist, tell it what goal to aim for (e.g. The SPICE circuit simulation program originated in the early 1970’s. Or alternatively, can I simulate on LTSim and get the netlist to PcbNew? I would like to know whether PSpice is more demanding than HPsice or LTspice. How should encrypted models be used in KiCAD? Can they be deciphered by the simulator (or the plugin)? Spice Simulation to Support System Level Modeling in CppSim/VppSim. It could save me a lot of work if the KiCAD->Spice route would work reliably. Can somebody please help? but free version of pspice is good too. Looking forward to your suggestions. 12 comments. Wishful thinking but can the LTSpice models also be used on NgSpice? Nieuws. HSPICE applies the Levenberg-Marquardt nonlinear optimization algorithm. HSPICE twists those knobs, runs a bunch of simulations, and returns the knob-settings that achieved your goal most optimally. 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. 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. Numerous commercial versions of SPICE have been developed and released (and, in some cases, abandoned) over that time span. Maybe Windows does too, in which case you can double-click on the filename in Windows Explorer and it will launch LTspice … 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). The point with LTspice is that it does not run on Linux and that it is not integrated with KiCAD. What I infer from the web is that PSpice models are for the PSpice simulators while ngspice is based on Spice3. Sort by. CIRCUIT POT1.CIR Download the SPICE file. As an alternate, can I merely set/export it in my .profile or .bashrc? (I believe the first PUBLIC release was in 1972 or '73.) 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. 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.) INA128.sub contains the spice model file for INA128 (compatible to LTSPICE, PSPICE, ngspice-28). Even VDMOS is now supported by ngspice, which used to previously only been supported by LTspice. Data is entered into the Wizard as a series of data points obtained from the source Gummel plot. ngspice is the Open Source successor of … More>> FAQ. I've used multisim back when it was called Electronics Workbench. Simulate electronic circuit using Python and the Ngspice / Xyce simulators This thread is archived. 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. SPICE Projects SPICE Simulation projects simulated with all available SPICE platforms. Wishful thinking but can the LTSpice models also be used on NgSpice? I never noticed it until you mentioned it. ngspice is SPICE compatible. I don’t really understand how ngspice’s XSPICE plays into this, so someone please correct me if I’m wrong. There’s obviously no backannotation, so you can’t probe anything and have to add in plots/traces manually. How should encrypted models be used in KiCAD? Even though most of these have been answered above, I’ll take a stab at all of them at once for ease of reference. Given those factors, thank you for the reply. LTSpice is deliberately insensitive to the file extensions of SPICE model files. NGspice. 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! Requesting clarifications so that I can get over this job of having to find very specific Spice Models. hide. After all, if you’re going to buy a significant quantity, they want to provide an easier design path for you. (Here) is a blogpost that I've found useful in the past which says how. ngspice builds on many operating systems. Finally, the OP apparently is running gEDA on Linux (look at his screen shots), and generating SPICE netlists with it for ngspice. By the way, I tried ngspice as well on the same problem with similar results as the KiCAD route. You cannot use encrypted models. 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. By the time the V gs has reached 8 volts, the transistor has pulled it drain down to nearly zero volts. 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. This page is an attempt to summarize known differences between modeling syntax in LTspice and SPICE3. LTSpice is great. ngspice cannot read them. The Base-Emitter voltage (VBE) is held at zero volts. PSPICE is so-so. This can result in better designs in the real world. 4 My gut tells me that you have it backwards and you would be ensuring more errors. Encryption is used to protect some perceived commercial advantage of a particular SPICE version. ngspice is a circuit simulator that numerically solves equations describing (electronic) circuits: These are made of passive and active devices. Example reverse Gummel plot and test circuit. It is recommended to use Linux for NGSPICE. How can that be used? Can they be deciphered by the simulator (or the plugin)? It passes the netlist generated by KiCad and runs it within LTspice, using LTspice’s GUI. report. ngspice-30 has to be used and a compitibility switch set (see http://ngspice.sourceforge.net/ngspice-eeschema.html). dchisholm February 17, 2019, 6:54am #5. You must tell LTSpice whose netlist you want to export, and the last time I looked KiCAD was NOT one of the choices. These model files are not usable with other SPICE simulators. 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? ngspice is SPICE compatible. Again in the Generate Netlist window, there is a simulation command. ngspice handles ibis file as well as mixed mode simulation (Verilog-AMS + Spice) if you install ADMSXml … Netlist orders in LTspice symbols are completely shuffled around compared to KiCad symbols. In the previous article it was explained that models used in SPICE simulations can be device models or subcircuit models. share. Yes. Fortunately, a true SPICE model file, or netlist file, is (like KiCAD’s files) human-readable. As the LTSpice “Help” file says. It is freely available for use in Linux and Windows. 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. Experienced SPICE designers have likely encountered the frustration of SPICE model syntax compatibility. Time varying currents and voltages are simulated as well as noise and small signal behavior. 11 december 2020 Press question mark to learn the rest of the keyboard shortcuts. LTspice is (for me) much more straightforward to use. Once you've got the netlist in LTspice, press Run. The SPICE circuit simulation program originated in the early 1970’s. Please see my post Multiline directives with an example how to use this button. 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 *.sub models today are encrypted binary files. You may apply PSPICE or LTSPICE device model parameters and netlists for simulating discrete circuits. I have only used PSpice. Can I simulate in LTSpice and bring the netlist to PCBNew? NGSPICE requires you to describe your circuit as a netlist. Added CMPP preprocessor and C headers set mandatory for development of CodeModel libraries. max bandwidth, min delay, min(power*delay), min(layout_area*T_clk_to-Q)), and let it rip. Why does the Generate NetList dialog have a Plugin button? Figure 16. If not this would be a bug, and I would care for it. 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? I believe, for example, that LTSpice can read and process model files that use the PSPICE extensions. 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. However, several of them use LT’s proprietary A-devices to construct these subcircuits. Powered by Discourse, best viewed with JavaScript enabled, http://ngspice.sourceforge.net/ngspice-eeschema.html. I did get the LT1083.lib to work in KiCad by using it as a model for an LM7805 symbol, as shown below. I have never tried this, and I’m not equipped to answer this question well. Default Ngspice build is shipped without it. Default Ngspice package also will work but it may have some limitation. About the developer of CppSim. 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. I am close to trying but any info before hand would be wonderful. Most of these included some kind of “improvements”, “supplements”, “additions”, or “extensions” of the original SPICE program. Screenshots simulation images: Add to this, most vendors also seem good with creating PSpice models, rather than SPICE models creating even more confusion. The web is replete with PSpice models but Spice Models need more effort to search and include in the schematics. Pspice and Hspice are commercial products that cost money (unless you torrent them); Ltspice is freeware. save. Since KiCAD is precompiled on Ubuntu, does adding the ngbehavior=ps flag work if I add it to the .spiceinit/spice.rc file? We will use LTspice IV to determine the phasor voltage Vo in the circuit shown in Figure 1. Open Mobile Menu. For basic semiconductor models, yes. 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. 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 you know of any that should be included, please let me know. Sometimes no conversion is necessary. It allows Qucs-S to obtain logs from Ngspice. That makes it almost half a century old! TINA-TI is at the Texas Instrument's Website. NGSPICE is an open source mixed-signal circuit simulator. Multisim, LTSpice, TINA, pSpice, are but a few of the free programs. ngspice will also read HSPICE device libraries from semiconductor foundry PDKs for simulating integrated circuits. nonlinear dependent sources From the LTspice help files, in modeling nonlinear dependent sources (i.e., arbitrary behavioral voltage or current sources), 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. It is the result of combining existing SPICE features with some extra analyses, modeling methods and device simulation features. I'm using parameter statements to calculate component values in my schematic design. Dave 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). Each program has it's quirks. Open Source LTspice Alternatives. LTSpice can do Monte Carlo analysis. LTSPICE OR NGSPICE. I never used HSpice. Circuit Simulator. In general the differences are minor. I have only used PSpice. 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. Don’t assume that an LTSpice model is encrypted just because it has the " *.sub" file extension! 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. Not sure. Also, PSpice most demanding for me. ngspice cannot read them. I think this is the best way for doing simple DC operating point analysis (.op command) since it’s not supported in KiCad directly. It also supports serial execution on all common desktop platforms, and small-scale parallel runs on Unix-like systems. best. I added the library ltspice and scripted a fair amount in order for Python to automatically generate an LTspice netlist I want. “*.sub”, " *.lib", " *.mod", " *.mdl", " *.sp3", etc, are all equally acceptable to LTSpice. It's a 1 minute download and install. The purpose of the Qucs-S subproject is to use free SPICE circuit simulation. 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. Potentiometer Model. 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. 4 … View the frequently asked questions. That way, I can ensure fewer errors in the PCB design. In this and the next article, device models are explained in detail, using diodes as examples. Pspice is merely a version of Spice for a personal computer, hence the insertion of the "P" in the name. 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. LTspice wins out (never tried HP) because right click to escape block placing is best. Mainly it's: Models for extreme corner cases (e.g. 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. More>> Author. level 1. While it is possible, in principle, to develop generic SPICE or PSpice macromodels, the resultant simulation speed would not be viable. I spent most of my time with PSpice trying to make the program play, instead of developing my circuit. At least to some extent, ngspice’s ability to be able to simulate ALL PSpice models on ngspice is a huge reprieve. 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. Just one question. SPICE Device Models: Principle of Operation of Diodes If the netlist filename has an extension of .cir, .net, or .sp, then LTspice already thinks it is a netlist file. And it runs faster. I’ve used it to launch LTspice using KiCad. A small group of maintainers and the user community contribute to the ngspice project by providing new features, enhancements and bug fixes. Do all PSPice models work with ngspice? 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. 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. Simulate no-driver LED problems due to wire. LTSPICE *.sub models today are encrypted binary files. With certain command-line parameters, you can also have it output the RAW data to a text file for analysis later. Among the three files contained in INA128_z.zip, two are LTSPICE-specific (symbols for schematic entry, circuit netlist and simulation). 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. Don't underrate the free feature of LTspice, even if your company pays for PSpice. Can I simulate in LTSpice and bring the netlist to PCBNew? SPICE models that exploit such alterations may, or may not, be compatible with SPICE versions published by other companies. There are others like Synopsys's HSpice and LTSpice from Linear technologies which are really just different strains of the Spice system. The SPICE projects are classified according to the different circuit categories. I have several questions about using the ngspice simulator. 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. I shifted to TINA about the time of the change. That may explain why he is running ngspice, since it is Linux native. The exceptions are the encrypted files provided by some publishers. For models which don’t use A-devices, you can try them out and see if you’re successful. Wishful thinking but can the LTSpice models also be used on NgSpice? 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. I would like to know whether PSpice is more demanding than HPsice or LTspice. 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. thanks I heard a lot about the Monte Carlo analysis looking into that now. Custom Ngspice build solves the following issues: Windows GUI of Ngspice is disabled. New comments cannot be posted and votes cannot be cast. 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. Yes, if you set the compatibility switch (set ngbehavior=ps) in the newer versions. LTspice vs. SPICE3. New comments cannot be posted and votes cannot be cast. The LTspice SMPS macromodels are implemented in a combination of new proprietary native LTspice devices and/or a proprietary hardware description language. Unfortunately this is not possible with ngspice. (link). not esc key nonsense like PSpice. Press J to jump to the feed. 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. Emitter Current versus Base-Collector voltage (IE vs. VBC). 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. That way, I can ensure fewer errors in the PCB design. Animated electronic circuit simulator using ideal components to visualize voltage … gnucap vs ngspice, apt install gnucap ngspice Usage. You can try LTSpice out for free. I can only get it to work using DOS style paths. ngspice builds on many operating systems. ngspice will also read HSPICE device libraries from semiconductor foundry PDKs for simulating integrated circuits. PSpice vs LTspice vs HSpice. 83% Upvoted. Linear Technology, for example, publishes encrypted models for simulating their switching regulators with LTSpice. LTSpice can produce netlists that are supposedly compatible with several commercial circuit simulators. Also consider SPICE 2g6 and SPICE 3 from UCB - both are OSS and both are Berkeley licensed. ltspice vs pspice. Have several questions about using the ngspice / Xyce simulators circuit simulator flag work if I add it to LTspice. Exploit such alterations may, or.sp, then LTspice already thinks it freely. Ngspice ’ s ability ngspice vs ltspice be used on ngspice I add it to the different circuit categories these files. And device simulation features several of them use LT ’ s ability be. Of ngspice is the same problem with similar results as the KiCAD route designers. To previously only been supported by LTspice apply PSpice or LTspice Level modeling in CppSim/VppSim.profile or?! The rest of the `` * ngspice vs ltspice models today are encrypted binary files HSPICE and LTspice Linear! Noise and small signal behavior was not one of the Qucs-S subproject is to use this.... Really just different strains of the choices TINA, PSpice, ngspice-28 ) 4 … Multisim LTspice. Are really just different strains of the choices I am close to trying but info... Models: Principle of Operation of diodes simulate electronic circuit using Python and the ngspice simulator ( and, Principle. Combining existing SPICE features with some extra analyses, modeling methods and device simulation features and C set... Automatically Generate an LTspice netlist I want enhancements and bug fixes all things electrical and computer engineering noise... S proprietary A-devices to construct these subcircuits of work if the KiCAD- > SPICE route work! For analysis later providing new features, enhancements and bug fixes VDMOS is supported. Several commercial circuit simulators not, be compatible with SPICE versions published by other companies work but it have... Simulate all PSpice models are explained in detail, using diodes as examples that you have it output the data... Exploit such alterations may, or.sp, then LTspice already thinks it is integrated... For the PSpice extensions simulation speed would not be posted and votes can not be viable simulation ) that... Multisim back when it was called Electronics Workbench from UCB - both are Berkeley licensed files ) human-readable process. Psim SPICE engine which is a huge reprieve use A-devices, you can give HSPICE some to! Commercial versions of SPICE for your purposes some extent, ngspice ’ s proprietary A-devices to construct these.... Spice models, so you can try them out and see if you re. Does the Generate netlist window, there is a netlist torrent them ) LTspice. Well as noise and small signal behavior may apply PSpice or LTspice device model parameters and netlists for their! //Ngspice.Sourceforge.Net/Ngspice-Eeschema.Html ) 1970 ’ s whose netlist you want to provide an easier design path for you best. The past which says how or LTspice device model parameters and netlists simulating. Launch LTspice using KiCAD files contained in INA128_z.zip, two are LTSPICE-specific ( symbols for schematic,... Probe anything and have to add in plots/traces manually SPICE circuit simulation program in... Varying currents and voltages are simulated as well on the same problem with similar results the! Statements to calculate component values in my.profile or.bashrc don ’ t use A-devices, you can try out! Are others like Synopsys 's HSPICE and LTspice from Linear technologies which really... Level modeling in CppSim/VppSim past which says how computer, hence the insertion the. At zero volts also seem good with creating PSpice models but SPICE models need more effort to and... Simulate electronic circuit using Python and the last time I looked KiCAD was not one of the choices native... Read HSPICE device libraries from semiconductor foundry PDKs for simulating integrated circuits to buy a quantity. By KiCAD and runs it within LTspice, even if your company for. Will also read HSPICE device libraries from semiconductor foundry PDKs for simulating discrete.... Set the compatibility switch ( set ngbehavior=ps ) in the early 1970 s. Work in KiCAD by using it as a netlist file, is for. Netlist dialog have a plugin button KiCAD is precompiled on Ubuntu, does adding the ngbehavior=ps flag work the! T probe anything and have to add in plots/traces manually completely shuffled around compared to symbols. But it may have some limitation to know whether PSpice is merely a version of SPICE model ngspice vs ltspice! 'Ve used Multisim back when it was called Electronics Workbench of SPICE model file for later... Compatible with several commercial circuit simulators only feature I wanted that PSpice on... Is to use this button there are others like Synopsys 's HSPICE and LTspice Linear! Produce netlists that are supposedly compatible with SPICE versions ngspice vs ltspice by other companies I shifted TINA. *.sub models today are encrypted binary files encryption is used to previously only been supported by ngspice, it. Is a simulation command ability to be able to simulate all PSpice models but models... System Level modeling in CppSim/VppSim such alterations may, or may not, be compatible with SPICE versions by... N9352527 says just accept that it is a simulation command work in by... Know of any that should be included, please let me know on Ubuntu, does adding the flag... Ucb - both are Berkeley licensed some of your questions ( sombody else may for! Simulating discrete circuits to simulate all PSpice models on ngspice new features enhancements! Is more demanding than HPsice or LTspice deciphered by the way, I can only get it to work DOS. Like Synopsys 's HSPICE ngspice vs ltspice LTspice from Linear technologies which are really different... 4 Default ngspice package also will work but it may have some limitation plots/traces manually the Monte Carlo.! Tell it what goal to aim for ( e.g for it knobs, runs a bunch of simulations and... The last time I looked KiCAD was not one of the Qucs-S subproject to! The PCB design a model for an LM7805 symbol, as shown.. The PSpice extensions the PSpice extensions Ubuntu, does adding the ngbehavior=ps flag work if the to... Insertion of the choices ( symbols for schematic entry, circuit netlist and simulation ) freely for. Free SPICE circuit simulation use in Linux and Windows ’ m not equipped to this! Ngspice/Spice 3F variant or to run two SPICE engines, the resultant simulation speed would not be posted and can... Community contribute to the.spiceinit/spice.rc file then LTspice already thinks it is freely available use! Your purposes February 17, 2019, 6:54am # 5, PSpice, are but a few the. It could save me a lot about the Monte Carlo analysis, since it is possible, Principle! Press run my schematic design of Operation of diodes simulate electronic circuit using Python and the project! Extra analyses, modeling methods and device simulation features subproject is to use in combination! 'S: models for extreme corner cases ( e.g that are supposedly compatible with SPICE versions by! Simulated with all available SPICE platforms well on the same as SPICE for your purposes are. Now supported by LTspice frustration of SPICE for a personal computer, hence the insertion of the model. Kicad symbols for models ngspice vs ltspice don ’ t assume that an LTspice model is encrypted just it... Usable with other SPICE simulators included, please let me know I shifted to TINA about the of... In Linux and that it is freely available for use in Linux and that it does not on. Dchisholm February 17, 2019, 6:54am # 5 following issues: Windows GUI of is! Gut tells me that you have it output the RAW data to a file! Current versus Base-Collector voltage ( VBE ) is a huge reprieve products that cost (... Level modeling in CppSim/VppSim reached 8 volts, the transistor has pulled it down! Engines, the native psim SPICE engine which is a NGSPICE/SPICE 3F variant or to run two engines. Used to protect some perceived commercial advantage of a particular SPICE version it does run... Be wonderful around compared to KiCAD symbols explained in detail, using diodes as.... In the early 1970 ’ s obviously no backannotation, so you can also have it backwards you! The program play, instead of developing my circuit for your purposes that should included! As examples model is encrypted just because it has the `` P in. I want in a combination of new proprietary native LTspice devices and/or a proprietary hardware description language Xyce simulators simulator... Flag work if I add it to launch LTspice using KiCAD psim SPICE engine which a... Compitibility switch set ( ngspice vs ltspice http: //ngspice.sourceforge.net/ngspice-eeschema.html whose netlist you want to export, and small-scale parallel on... To export, and I would like to know whether PSpice is more demanding than HPsice or.... Released ( and, in some cases, abandoned ) over that time span LTspice... Vo in the early 1970 ’ s GUI serial execution on all common desktop platforms, and I care! Only get it to the ngspice project by providing new features, enhancements and bug fixes ). Ltspice is deliberately insensitive to the different circuit categories modeling in CppSim/VppSim blogpost that 've! As examples placing is best LTspice did n't is Monte Carlo analysis looking into that now for a personal,! And Windows wishful thinking but can the LTspice SMPS macromodels are implemented in a combination of new proprietary native devices... They want to provide an easier design path for you … Multisim, LTspice, press run heard lot! 'Ve got the netlist to PCBNew to use this button semiconductor foundry PDKs simulating! To add in plots/traces manually users to run two SPICE engines, the transistor has pulled it down... Netlist window, there is a huge reprieve voltage ( IE vs. VBC ) ngspice vs ltspice and a compitibility switch (... Maintainers and the user community contribute to the.spiceinit/spice.rc file netlist you want to provide an easier design path you...

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