Its quite a simple implementation that can be used to go trough multiple parameters at the same time.LTspice Tutorial series:EP1-Getting started: https://youtu.be/JRcyHuyb1V0EP2-AC simulation and the Baxandall tone control circuit: https://youtu.be/P_ENvucaZkIEP3-.param and .step directives: https://youtu.be/ARE5nwiHI0QEP4-How to import libraries and component models: https://youtu.be/8V5XabccFaEEp5- Stock example simulations to play with: https://youtu.be/MwfeMjcM4zYEp6- Basics of FFT analysis and .four statment: https://youtu.be/rVAvW1Jh2AEEP7- Dependent voltage and current sourceshttps://youtu.be/Jn8mJG3qeooEp8- Turning a datasheet into a component modelhttps://youtu.be/0smuo8bMRn4EP9- Independent voltage and current sourceshttps://youtu.be/nPZ7vneN3v8Ep10- .wave statement and audio file processinghttps://youtu.be/mdJm-TzrBsAEp11 The effect of temperature on your circuithttps://youtu.be/VzxnNrOMcMoEP12 Modeling a DC brushed motorhttps://youtu.be/Wc4XzTrWSpoEp13- Worst Case, Monte Carlo and Gaussian statistics circuit analysishttps://youtu.be/NdGqboW2VcYEP14 - Digital circuits and logic gates https://youtu.be/JttE2NObDPMEP15- SMPS EMI and electrical noise and filtershttps://youtu.be/QEAzcaiBrpYEP16- Feedback loop simulationhttps://youtu.be/X4yaBwaO1gkEp17 - Verifying Simulation Modelshttps://youtu.be/DSDiIkKQaAEEp18 - Simulating Capacitorshttps://youtu.be/QpWPTolhfEoEp 19 - Simulating Inductorshttps://youtu.be/65fNDRows90EP 20 - Noise simulations https://youtu.be/Dh5XmFXlljIEp21 - Models and Librarieshttps://youtu.be/GUFMfSlD2AMEp22- Voltage and current limited sourcehttps://youtu.be/DnKnuJd3-ecEp23- Measuring Power Factorhttps://youtu.be/qZXOMPxbqh8Ep24 - Modeling a vacuum tube triodehttps://youtu.be/7v9dG1uteAQEp25- Using standard symbolshttps://youtu.be/BFMVujjH0loEp26- Modeling transformershttps://youtu.be/muUwe8X51oYEp27 - Stepping sets of parametershttps://youtu.be/1iOzX91LJ8gSpecial Thanks to all my supporters on Patreon! Visitors have the right to withdraw their consent. You need to replace this with your parameter designator; put that inside {} brackets, e.g. LTSpice: Step multiple parameters simultanious Uwe Bonnes Aug 1, 2006 Search Forums New Posts U Uwe Bonnes Jan 1, 1970 0 Aug 1, 2006 #1 Is it possible to define the step function so that it influences multiple parameters at once? color of data point should only depend on one parameter, not the other.). Prior to joining ADI, Gabino held various positions in marketing, engineering, operations, and education at Linear Technology, Texas Instruments, and California Polytechnic State University. of runs Would the magnetic fields of double-planets clash? A .param statement can also be placed on a schematic as a SPICE Directive. If you've got a resistor R5 on your LTSpice schematic, for example, then Control-Right click over the component to pull up the Component Attributes dialogue box. (I.e. You can duplicate this by taking the text at the end of this section and saving it as a file in your LTSpice Firstly, The parameter you wish to vary needs to be designated. One way to achieve this is to create a list of desired values to test. Whats the grammar of "For those whose stories they are"? How? We are going to work on this exercise in a slightly different order than the one asked by the exercise. Although the .tran of dot command was created from the screen of Edit Simulation Command, it can also be created by Edit Text on the Schematic. On the output graph, add the signals of interest to that graph (in this case Vo) and add a cursor. For How to set up detailed transient analysis. I'm just wondering if I can manually change the color settings of the data points. If you move the keys up and down in your keyboard you will be able to change between all the different answers. Is it possible to step 2 parameters together? Making statements based on opinion; back them up with references or personal experience. Each param should have 3 pairs in it, not three values. If you ever get stuck working with LTSpice, there is a pretty comprehensive set of resources available in the Help menu, including more examples regarding usage. Thankfully, LTSpice generates data when doing a transient analysis with multiple stepping parameters fairly easily. is no. I would like to simulate those three situations and plot them together. Can I specify that it should only change color when stepping one of the parameters? Thanks for weighing in! You've likely already given it a value, eg 1k0. I'm confused, do you want to simulate 3 situations or more? You should see ".step param R2 100 400 100" at the bottom of the screen. I think this message isn't appropriate for our group. The waveform viewer is a function that displays the simulation results executed with LTspice as a LTspice-Independent Voltage Source Setting. In this article, we will focus on how to set up a independent voltage source for analysis. This time, set the feedback resistor R2 of the op-amp. We have already set the signal source in the article of "How to Draw a Schematic", but let's check it just in case. From the list of options select the desired one. flower arranging classes northern virginia. Input Name of parameter to sweep: R2, Nature of sweep: Linear, Start value: 100, Stop value: 400, Increment: 100. Once the simulation stops, I need to use cursors in Probe to figure out which combination of parameters generates close to a a certain result. LTspice table function. It is necessary to set the part which changes the parameter in parametric analysis. Relation between transaction data and transaction id. LTspice is employed for this experiment. Like this: .params R=tbl (n, 1,1k, 2,10k, 3, 22k) .params C=tbl (n, 1,1p, 2,10p, 3,22p) use {C} as cap value and {R} as resistor value Then use step command .step param n list 1,2,3 Click to expand. Step independent voltage source V1 from 1 to 20 logarithmically with 5 points per octave. ltspice step multiple parameters. If you want to lay out the schematic editor and graph pane, see the following article, Display the schematic editor and waveform graph side by side. What I mean to do exactly is this: If there were just one resistor whose resistance to vary, then I would just set its resistance to "{r1}" (I use lower case letters to make it a different variable/parameter than R1) and use a command such as: However, since I have to change two parameters (together) two times each, I have read here that (at least on LTSpiceIV) that a workaround to my problem could be using something like this: Upon doing the simulation, I get the following warnings: For some reason, the simulation doesnt "break" if I add one extra element to the table. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. The way to do this is with a single .STEP command. To be clear I've used {R5} for my convenience and understanding. If you simulate multiple parameters at the same time, LTSpice will compute all possible combinations between those parameters. If I'd used {Pickle} then the line would read: The next two lines in the script above tell LTSpice that the parameters for R5 and R6 should follow the steps designated as Rx. Something like 2023 A place to ask questions, discuss topics and share projects related to Electrical Engineering. You can combine your sweeps by inventing integers that composite them together and then divide them back out using LTspice functions that are available to you. I managed to do it using the TABLE function for each of the five variables. Remember that R5 relates to the parameter designator. Enclose your variable names in curly braces, in this case {RL}, and then set the SPICE directive .param with the desired valued for your variable name. The result would be three simulation runs with C1 matching each of the values specified in the ".step" statement for each run. This video provides an overview of how to use the .STEP command to perform repeated analysis of a circuit in LTspice. Well for one the table command wants an index, which is X, then a set of xy pairs. The .step command in this case steps the parameter R through the values 10k, 20k and 30k. I think this message isn't appropriate for our group. Step a parameter run number, and from it generate the other parameter values required : Code: [Select] .step param run 1 3 1 ; middle no. I cannot use Monte Carlo since the cursor information is missing (i.e. What is the point of Thrower's Bandolier? This time, we set up transient analysis to be performed simultaneously with parametric analysis. 2: R1 = 1 M\$\Omega\$, R2 = 10 M\$\Omega\$, Sim. In any LTspice simulation, varying a parameter in a device or model is just as important as plotting voltages or currents, as it allows you to compare performance and develop your circuit intuition. This is the setting for performing a parametric analysis that changes the variable R2 from 100 to 400 ohms in 100 ohm linear steps. . Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. parameterized capacitance in the R-C circuit Asking for help, clarification, or responding to other answers. AC Op-amp integrator with DC Gain Control in LTspice, How to handle a hobby that makes income in US. Making statements based on opinion; back them up with references or personal experience. However, to my knowledge it is not possible to achieve what you asked for. End result is that my circuit, which other than those two values is in a fixed state, is now complete and, in the example I was trying to get to, I can see the effect on the regulated output. LTspice is a powerful and widely used SPICE simulation application. There are two ways to examine a circuit in LTspice by changing the value for a particular parameter: you can either manually enter each value and then simulate the circuit to view the response, or use the .step command to sweep across a range of values in a single simulation run. Please refer to the linked article for an explanation of After all, in order to learn how to use LTspice, it should be faster to use the practice form and to learn first than to read the instruction manual. Welcome to EE.SE! We are going to find c) and d) first and then find the equivalent Thevenin a), and at last we will find the current in RL for b). and what would happen then? rev2023.3.3.43278. Subject of the new topic: In addition, since the schematic was prepared here, if you want to start analysis immediately, download it by clicking the link below. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup, More than three nested parametric sweeps in LTspice. Of course, it does not matter if you enter 0.01 instead of 10m without using auxiliary units. This includes: harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing. Normally, LTspice sets the resistance element parameter to a constant such as R = 10. Lets build the LTSpice circuit with the original RL value first. E.G: In this example, I want to modify two resistors (R5 and R6) so I can see the output of my regulators, assuming that I change the values from 1 ohm to 5000 ohms over 100 steps. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? Stepping Parameters in LTspice IV LinearTechnology 10.8K subscribers Subscribe 486 Share Save 103K views 11 years ago LTspice with with Gabino Alonso, Strategic Marketing. Now, it is set to perform transient analysis for 10msec. G: Place ground. For example, combine parameter A and parameter B into a new parameter, (A*100+B), and sweep that. Google searching for SCR SPICE models, I found a SPICE file on EDN's website. Does a summoned creature play immediately after being summoned by a ready action? The command .step performs parameters sweeps. #ltspiceIn this video I look at how sets of parameters can be stepped at the same time using the .step command together with the table function. One parameter sweep/step can control multiple component values through expressions. Select Transient and enter 10 m for Stop time. Linear regulator thermal information missing in datasheet. Use MathJax to format equations. It's important to have all .step commands in one text box. There are two ways to examine a circuit by changing the value of a parameter: You can either manually enter each value then re-simulate the circuit, or you can use the .STEP command to sweep across a range of values in a single simulation run and produce a side-by-side comparison. Can be one line. Your control variable you are stepping could be a phase angle or time delay or similar that you input in one or more formulas/expressions to obtain resulting component values or parameters to be applied in the design as {parameter} MathJax reference. Disconnect between goals and daily tasksIs it me, or the industry? Found the answer in the group. Would the magnetic fields of double-planets clash? and what would happen then? 2022-06-30; The best answers are voted up and rise to the top, Not the answer you're looking for? Run the simulation and you should get the same results as in Figure 3. Press J to jump to the feed. #ltspiceIn this video I look at how sets of parameters can be stepped at the same time using the .step command together with the table function. The command ".step" performs parameters sweeps. Perform parametric analysis using the schematic in the following article. Example: .step oct v1 1 20 5. Then you use .include and .step param and the TABLE function in LTspice to perform the sweeps. The .step command causes an analysis to be repeatedly performed while stepping through a model parameter, global parameter or independent source. 1995 - 2023 Analog Devices, Inc. All Rights Reserved, LTspice: Using the .STEP Command to Perform Repeated Analysis. Why does LTspice XOR gate have more than two inputs? Analog Devices is in the process of updating our website. Its quite a . Are you sure you wish to repost this message? For example, we can parameterize the capacitance C1 in this simulation with the following modifications to the schematic. Setup the transient command as below. The new topic will begin with this message. 1: R1 = 1 k\$\Omega\$, R2 = 10 k\$\Omega\$, Sim. We comment the first SPICE directive line and uncomment the second line. Any number of parameters can be made into variables, however LTspice will run simulations on all the different combinations of each value. I hope I'm being clear. Interested in the latest news and articles about ADI products, design tools, training and events? Especially @afiskon and Ralf B.!If you liked this video be sure to check out my other videos and you can also subscribe to be up to date with all the new ones!If you want to support the creation of more and better videos please consider checking out: https://www.patreon.com/feszelectronics parameter combination) was used for each simulation. If you want to have the values of a resistor near to it, you can also enter (instead of value, when right clicking onto it). Radial axis transformation in polar kernel density estimate. Then use that parameter's values to control the other. I could open up the plot legend that shows the color of each point, but I don't see anywhere to change these settings. Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? Will Gnome 43 be included in the upgrades of 22.04 Jammy? In this post (. (I'm using the .op command). By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Why does LTspice XOR gate have more than two inputs? Connect and share knowledge within a single location that is structured and easy to search. Subject of the new topic: parameters through use of the Component Attribute Editor. This video provides an overview of how to use the .STEP command to perform repeated analysis of a circuit in LTspice. In this article, it was placed near source V1. Use MathJax to format equations. The addition of the curly braces around the variable is important as it tells LTspice IV that X is a parameter. Are you sure you wish to repost this message? Why does it seem like I am losing IP addresses after subnetting with the subnet mask of 255.255.255.192/26? The new topic will begin with this message. So I wrote a C++ script to create the tables as (long) text files. which parameter combination corresponds with which waveform). If you just want to simulate the 3 scenarios I wouldn't bother doing it with spice. Make sure the "SPICE directive" is selected and enter ".step". Then, in the waveform viewer, you can have three plot panes each showing only the result for each step by specifying "@" for the displayed value. MathJax reference. Are you sure you wish to delete this message from the message archives of LTspice@groups.io? Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Note: * is used as a comment in SPICE. Lets start by creating a user-defined variable in LTSpice. For additional information you may view the cookie details. Parametric analysis is performed simultaneously with transient analysis, AC analysis, DC sweep analysis and so on. After running the simulation we get the following plot with Vo vs RL. After running the simulation, you can iterate through all the answers the same way as we did in Figure 6 and 7. Something like this: Paul asked how to step two parameters at once. If you check the voltage waveform of OUTPUT, you can see that it increases from 2V to 8V each time the parameter of feedback resistor of op amp increases. Besides, the Monte Carlo will take too long and it may 'duplicate' some combinations. To know which value of RL corresponds to that particular answer, right click with your mouse on top of it and a pop up window will show you the respective parameter value. I guess I'll just have to export the data and plot it elsewhere. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? Why is this sentence from The Great Gatsby grammatical? LTSpice: How to start the step of a voltage source at a different time in the transient simulation than t=0s? This is not what OP is asking about. It is performed simultaneously with transient analysis, AC analysis, DC sweep analysis, etc. Click "SPICE Directive" on the toolbar to display "Edit Text on the Schematic" screen. The voltage waveforms of OUTPUT appear on the graph pane. Here is a list of some hotkeys for creating your schematic: R: Place resistor. The list examples detailed above is a different way of achieving the end result required, but it looks like some of the comments are because, as was the case with me, it was not understood that you can't use the component designators without doing the {} thing. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? Import Parametric Sweep data from LTSPice into Matlab, Modelling a low-pass filter on LTSpice to filter an input square wave at 50kHz to obtain a sinusoidal output at 50Hz, LTSpice, AD8677 instance has more connection terminals than the definition, LTspice singular matrix error by changing model parameters. This time I set the variable to R2, but anything with alphanumeric characters is fine. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup, How to use .step param with more than two parameters in LTSpiceIV. Thank you. The problem was that the size of the tables (given by the number of total parameter combinations) was prohibitive to write by hand. communities including Stack Overflow, the largest, most trusted online community for developers learn, share their knowledge, and build their careers. If you want to lay out the schematic editor and graph pane, see the following . Figure 1. If you simulate multiple parameters at the same time, LTSpice will compute all possible combinations between those parameters. How to use Slater Type Orbitals as a basis functions in matrix method correctly? The Thevenin resistance is equal to RL for maximum power, in this case Rth = 12. One of those flavors is the ability to include a list of values for your variable name. Visitors have the right to withdraw their consent. 2. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. For instance, the forward voltage of a diode will change over different temperatures, the VBE of transistors, the RDSon of MOSFET and so on. Is there a trick I can use to overcome the 'up to three nested loops' limitation? Click SPICE Directive on the toolbar to display Edit Text on the Schematic screen. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Gabino Alonso is currently the director of strategic marketing for the Power by Linear Group. vegan) just to try it, does this inconvenience the caterers and staff? Subscribe today! The .step command has different flavors. We are almost there.
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