Yes you can do that (assuming you don't need to dynamically change the voltage within a .tran run) by parameterising the sources and using the table() function to look up the desired values. In that case, the simulation takes too long, advancing more slowly every time, as it would never end. Learn more about Stack Overflow the company, and our products. 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. It only takes a minute to sign up. To plot a specific answer, right click on the graph, go to View and select Select Steps. 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. As .tran 10m of dot command appear, place it at an appropriate position. We are commenting the second Spice directive for now. To learn more, see our tips on writing great answers. If you simulate multiple parameters at the same time, LTSpice will compute all possible combinations between those parameters. We are going to work on this exercise in a slightly different order than the one asked by the exercise. Besides, the Monte Carlo will take too long and it may 'duplicate' some combinations. Input Name of parameter to sweep: R2, Nature of sweep: Linear, Start value: 100, Stop value: 400, Increment: 100. 'Jonk' may be up to something but still unclear how to perform for example 5x10x4x4x6=4800 independent simulations by 'combining' parameters and then 'breaking them back'. 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). The ".step" of dot command appears, so place it at an appropriate position. The only change that we need to make is to add a set of values for the variable parameter RL. I've called the parameter Rx: The 1st line defines the steps I want to take as detailed above. Why is this sentence from The Great Gatsby grammatical? 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! Now, it is set to perform transient analysis for 10msec. In this article, we would like to easily check the analysis results with the LTspice voltage probe. Using Kolmogorov complexity to measure difficulty of problems? I cannot use Monte Carlo since the cursor information is missing (i.e. By computing 1-u(Temp) the temperature coefficient tc3 is effective only if Temp < 0 C. For example, combine parameter A and parameter B into a new parameter, (A*100+B), and sweep that. Linear regulator thermal information missing in datasheet. I'm just wondering if I can manually change the color settings of the data points. This is useful for associating a name with a value for the sake of clarity and parameterizing sub circuits so . parameters through use of the Component Attribute Editor. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. We are almost there. In many practical situations, a circuit is designed to provide power to a load, and sometimes it is desirable to maximize the power delivered to that same load (normally called RL). The .step command is then used to step R through different values. Firstly, The parameter you wish to vary needs to be designated. The result would be three simulation runs with C1 matching each of the values specified in the ".step" statement for each run. Another way to simulate a set of values at the same time is to use the increasing order option of the .step command. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? Add a cursor to the graph and check the value of RL that gives you the maximum power value (the global maximum of the power curve). So the table of the values start with the index identifier (here n) then follows the pairs index, value . From the list of options select the desired one. Visitors have the right to withdraw their consent. This multiple value parameter might have values with single quote, such as: abc, efg's, sms dio, 'you's dfd. Therefore, for: .step param A list 1 2. Define the component parameter with a variable by editing the component attribute (Ctrlright-click on the component) and entering {X} for the Value, where X is a user defined variable name. Make sure that the parameter of R2 is {R2}. did phineas and ferb die in a car accident. 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. To find the maximum power transferred to RL, we can declare RL as a variable resistor but this time we will run the DC Operating .op simulation to get an answer for a list of RL values. Example: .step oct v1 1 20 5. .step param B list 3 4. A place to ask questions, discuss topics and share projects related to Electrical Engineering. LTspice IV: Using the .STEP Command to Perform Repeated Analysis. Read more about our privacy policy. Refer to the following article for the detailed setting method of the signal source. The simulation time varies depending on the size of the circuit. Steps may be linear, logarithmic, or specified as a list of values. 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. Then use that parameter's values to control the other. Of course, it does not matter if you enter 0.01 instead of 10m without using auxiliary units. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How to use .step param with more than two parameters in LTSpiceIV, electronics.stackexchange.com/questions/20811/, How Intuit democratizes AI development across teams through reusability. This time, we set up transient analysis to be performed simultaneously with parametric analysis. and what would happen then? to get control about its order of execution." So as long it is in the same text box, it will follow the order you write it in. Lets build the LTSpice circuit with the original RL value first. What LTSpice does is automatically set each step to have a certain color automatically. 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. I found most of the solution for passing multiple value to stored procedure is to create a user defined function to put the string to a table, then grab the value from table to stored procedure. Analog Devices is in the process of updating our website. Notice Uin could be used as {Uin} in a voltage source or similar and so on. The waveform viewer is a function that displays the simulation results executed with LTspice as a LTspice-Independent Voltage Source Setting. Note: For this approach to run without errors, make sure that the size of the list is equal to number of variable parameters. Why does LTspice XOR gate have more than two inputs? Something like Now lets add a second trace on the graph and add the following SPICE expression, V(vo)*I(R3), to calculate the power across R3 = RL. 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. LTspice can be downloaded for free from here. Now LT spice knows what you're talking about when you start writing your scripts. Now lets change the values of RL automatically and analyze the results. I need to do three transient simulations with different values of certain resistors (conveniently called R1 and R2) in each. Thanks Ian.M, i tried it but cant seem to get it to work. G: Place ground. Visit Stack Exchange Tour Start here for quick overview the site Help Center Detailed answers. 3: R1 = 1 k\$\Omega\$, R2 = 1 M\$\Omega\$. The PARAM R can be referenced in a component value usng {R} notation. You should see ".step param R2 100 400 100" at the bottom of the screen. Your answer is a simple tutorial on a basic LTspice concept. I think this message isn't appropriate for our group. vegan) just to try it, does this inconvenience the caterers and staff? We have already set the signal source in the article of "How to Draw a Schematic", but let's check it just in case. You need to replace this with your parameter designator; put that inside {} brackets, e.g. Instead a combination of parameters using SPICE directives needs to be called for help . Is there a trick I can use to overcome the 'up to three nested loops' limitation? On the output graph, add the signals of interest to that graph (in this case Vo) and add a cursor. Subscribe today! I think this violates the Terms of Service. It would take time to add and adjust values using the .step list method. This time I set the variable to R2, but anything with alphanumeric characters is fine. I think this violates the Terms of Service. Step a parameter run number, and from it generate the other parameter values required : Code: [Select] .step param run 1 3 1 ; middle no. 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. How can I use it? This includes: harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. I have an LCR circuit including voltage sources where I need to sweep more than three parameters (nested sweep) for a transient simulation. PSPICE is more suited for this but if you are good at scripting, this should be possible to solve in NGSPICE. Visit Stack Exchange Tour Start here for quick overview the site Help Center Detailed answers. We comment the first SPICE directive line and uncomment the second line. Does a summoned creature play immediately after being summoned by a ready action? LTSpice for Windows introductory tutorial The circuit It was used in class, and it is a nice example of a circuit that can be handled using node-voltage, mesh-current, or superposition techniques. I guess I'll just have to export the data and plot it elsewhere. In addition, since the schematic was prepared here, if you want to start analysis immediately, download it by clicking the link below. 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. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Press J to jump to the feed. After we finish updating our website, you will be able to set your cookie preferences. After simulation, the graph pane will appear at the top of the schematic with the default settings of LTspice. Radial axis transformation in polar kernel density estimate. However, with the .step increase order method that can be done faster. https://groups.io/g/LTspice/topic/50201465#60860). Does the LT Spice monte carlo simulation definitely output the max and min voltage for any number of simulation runs? In this article, we will focus on how to set up a independent voltage source for analysis. He holds a Master of Science degree in electrical and computer engineering from University of California, Santa Barbara. Can be one line. Subject of the new topic: Read more about our privacy policy. Thank you. What sort of strategies would a medieval military use against a fantasy giant? Are you sure you wish to delete this message from the message archives of LTspice@groups.io? For the types of analysis, please see the following article. In this article, we will explain in detail how to set the simulation command used for the following six types of analysis. 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. Prior to joining ADI, Gabino held various positions in marketing, engineering, operations, and education at Linear Technology, Texas Instruments, and California Polytechnic State University. The new topic will begin with this message. Groups.io, Is there a way to have LTspice step multiple parameters as a, --- In LTspice@, "dan.friedrichs"
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ltspice step multiple parameters