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Are you sure you wish to delete this message from the message archives of LTspice@groups.io? This video provides an overview of how to use the .STEP command to perform repeated analysis of a circuit in LTspice. Press keyboard letter "T" to show the spice directive. 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! MathJax reference. After running the simulation we get the following plot with Vo vs RL. PSPICE is more suited for this but if you are good at scripting, this should be possible to solve in NGSPICE. For example, combine parameter A and parameter B into a new parameter, (A*100+B), and sweep that. For LTspice, use tables to define params. LTspice parametric sweep: how to force the simulator to continue with the next step? You've likely already given it a value, eg 1k0. which parameter combination corresponds with which waveform). (c) and (d) answer -> RL = 12 for P = 33.33 W. To answer (a), we need the open circuit voltage (Voc) and the Thevenin resistance (Rth). Since (apparently) LT will only allow me to sweep through one variable at a time, I sweep through X and then I try to access the table's values according to the value that X has taken in that step. In this article, we will briefly introduce the types of analysis that can be performed with LTspice. I hope I'm being clear. In this article, we will focus on how to set up a independent voltage source for analysis. If I don't use the index in the tables I get the same error as indicated in the first post, The working solution was found after reading Then use that parameter's values to control the other. For instance, the forward voltage of a diode will change over different temperatures, the VBE of transistors, the RDSon of MOSFET and so on. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Using Kolmogorov complexity to measure difficulty of problems? This includes: harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing. On spice directive window, enter the step command as below. color of data point should only depend on one parameter, not the other.). Making statements based on opinion; back them up with references or personal experience. .param Rf=table(n,1,1.3k,2,1.1k,3,1.2k,4,1k), .param Cf=table(n,1,54p,1,64p,2,64pF,4,64pF), So Rf gets the value of the current index ( defined in the .step directive) For the Nozomi from Shinagawa to Osaka, say on a Saturday afternoon, would tickets/seats typically be available - or would you need to book? Now lets change the values of RL automatically and analyze the results. Refer to the following article for the detailed setting method of transient analysis. Then use that parameter's values to control the other. You can break that back out into A and B as it executes. 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. G: Place ground. It is performed simultaneously with transient analysis, AC analysis, DC sweep analysis, etc. This works the same way for all kinds of components and with an external script to create .asc files it can be used as a crutch for LTspices missing monte carlo functonality. Radial axis transformation in polar kernel density estimate. 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 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. At LTspice, are there any methods to change the values at once? Model Statements: Some devices, such as, transistors and diodes require information on the device in order to make calculations. If you want to lay out the schematic editor and graph pane, see the following . By computing 1-u(Temp) the temperature coefficient tc3 is effective only if Temp < 0 C. Difficulties with estimation of epsilon-delta limit proof, Follow Up: struct sockaddr storage initialization by network format-string. Does the LT Spice monte carlo simulation definitely output the max and min voltage for any number of simulation runs? For multiple lines in the "op" editor window use CTRL+M to keep all params in same textbox. As regards your second question, X would be the different indexes that let me access the table's values. I've done the trick with the Component Attributes dialogue on both components already. If you preorder a special airline meal (e.g. More than three nested parametric sweeps in LTspice, https://groups.io/g/LTspice/topic/50201465#60860, How Intuit democratizes AI development across teams through reusability. For this exercise, we have 2 variable parameters, Vs and R, which gives a total of 4 possible solutions. Step a parameter run number, and from it generate the other parameter values required : Code: [Select] .step param run 1 3 1 ; middle no. To be clear I've used {R5} for my convenience and understanding. In this article, we only used the waveform viewer to check the voltage waveforms of V(OUTPUT) with the voltage probe. 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. 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. First, prepare a schematic for parametric analysis with LTspice. 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. I need to try a large number of different combinations of parameter values (I have 5 parameters, each of them can take anywhere from 3 to 10 values, for a total number of combinations up to 5000). Subject of the new topic: The addition of the curly braces around the variable is important as it tells LTspice IV that X is a parameter. In this article, we would like to easily check the analysis results with the LTspice voltage probe. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. This time, we set up transient analysis to be performed simultaneously with parametric analysis. 1995 - 2023 Analog Devices, Inc. All Rights Reserved, LT6108 / LTC6994 Demo Circuit - Energy-Tripped Circuit Breaker with Automatic Delayed Retry (5-80V Input, 500mA Threshold), LTspice: AC Analysis Using The Step Command, LTspice: Using the .STEP Command to Perform Repeated Analysis. LTSpice doesn't know what your talking about until you do that bit. Since we dont have AC signals in this circuit, it is all DC analysis, we are going to simulate the DC operating point of the circuit using the .op simulation command. 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. What sort of strategies would a medieval military use against a fantasy giant? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. AC Op-amp integrator with DC Gain Control in LTspice, How to handle a hobby that makes income in US. After simulation, the graph pane will appear at the top of the schematic with the default settings of LTspice. Lets build the circuit in LTSpice. I've called the parameter Rx: The 1st line defines the steps I want to take as detailed above. Here is an example waveform response of an RC circuit, for which the capacitance is stepped through three values. Run the simulation and you should get the same results as in Figure 3. 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. In LTSpice the table command really creates a kind of dictionary where you have to specify key value pairs. Click "SPICE Directive" on the toolbar to display "Edit Text on the Schematic" screen. Subject of the new topic: However, with the .step increase order method that can be done faster. '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'. It is performed simultaneously with transient analysis, AC analysis, DC sweep analysis, etc. One of those flavors is the ability to include a list of values for your variable name. Note: To download the simulation files provided in this article, the reader must have LTSpice installed. run a simulation immediately. 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. 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. This video provides an overview of how to use the .STEP command to perform repeated analysis of a circuit in LTspice. After much thrashing around, I found there are two aspects to this problem that need to be explored. Read more about our privacy policy. Linear Algebra - Linear transformation question. I understand this would be easy to do if the parameters were somehow related (eg: set the value of C={R*constant} or whatever), but what if #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. A .model statement tells LTspice what parameters to use for modeling semiconductors. The only change that we need to make is to add a set of values for the variable parameter RL. For instance, plot V in a circuit with R=1 and C=1, then plot V with R=2 and C=2, then plot V with R=3 and C=3, etc. The simulation time varies depending on the size of the circuit. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? We are going to work on this exercise in a slightly different order than the one asked by the exercise. I think this message isn't appropriate for our group. I know I could just export a CSV file and plot them with Octave or Excel, but it would be so much more useful to do it directly on LTSpice. What is the point of Thrower's Bandolier? flower arranging classes northern virginia. Making statements based on opinion; back them up with references or personal experience. Thanks for weighing in! Click Simulate-Edit Simulation Cmd in the menu bar to open the Edit Simulation Command screen. Open the Independent Voltage Source screen by right-clicking the signal source V1 of the schematic with the mouse. In this case, the resistance value is varied from 1k to 10k. By clicking Accept All, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. For this exercise, we have 2 variable parameters, Vs and R, which gives a total of 4 possible solutions. Thanks for contributing an answer to Electrical Engineering Stack Exchange! For additional information you may view the cookie details. 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. To see the results with respect to time, we need to change the simulation type to .tran, transient analysis. Use MathJax to format equations. did phineas and ferb die in a car accident. Connect and share knowledge within a single location that is structured and easy to search. Why is this sentence from The Great Gatsby grammatical? During homework exercises or labs, sometimes you need to analyze the circuits for different components values. Doesn't analytically integrate sensibly let alone correctly. 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). I guess I'll just have to export the data and plot it elsewhere. Why does LTspice XOR gate have more than two inputs? Example: .step oct v1 1 20 5. 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? Asking for help, clarification, or responding to other answers. 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. Subscribe today! Found the answer in the group. In addition, since the schematic was prepared here, if you want to start analysis immediately, download it by clicking the link below. Is there a single-word adjective for "having exceptionally strong moral principles"? .step param B list 3 4. 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. Sim. Check that SINE is selected and DC offset [V]: 0, Amplitude [V]: 2, Freq [Hz]: 500 is input. In this post (. Would the magnetic fields of double-planets clash? For example, we can parameterize the capacitance C1 in this simulation with the following modifications to the schematic. https://groups.io/g/LTspice/topic/50201465#60860). is no. Are you sure you wish to delete this message from the message archives of LTspice@groups.io? After placement, right-click ".step" of the mouse to open the ".step Statement Editor" screen. LTspice - Resistor value controlled by on/off switch, How can one label a node with more than one name in SPICE/ LTspice. In this LTspice requires setting of the signal source when simulating. 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? 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. In this article, we will explain in detail the parametric analysis(.step) method in LTspice. It is necessary to set the part which changes the parameter in parametric analysis. Step independent voltage source V1 from 1 to 20 logarithmically with 5 points per octave. It only takes a minute to sign up. This could be a case of you get what you pay for. Analog Devices is in the process of updating our website. However, to my knowledge it is not possible to achieve what you asked for. Press J to jump to the feed. To implement this in LTspice, perform the following steps: Figure 1. this is how I roll it in 1 run (same method as what mr stilltrying said). We comment the first SPICE directive line and uncomment the second line. 3: R1 = 1 k\$\Omega\$, R2 = 1 M\$\Omega\$. After we finish updating our website, you will be able to set your cookie preferences. 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. 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. Any SPICE directive with a * in front of it, will not run during simulation. Firstly, The parameter you wish to vary needs to be designated. 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. You are missing a comma in the Vac table after the pair 3,200V. Linear regulator thermal information missing in datasheet. I think this violates the Terms of Service. Unfortunately, there's no editing messages but I knew whoever responded would be sure to correct me : ). D: Place diode. Gabino Alonso is currently the director of strategic marketing for the Power by Linear Group. Thanks for contributing an answer to Electrical Engineering Stack Exchange! We are almost there. You can duplicate this by taking the text at the end of this section and saving it as a file in your LTSpice I had the sense that LTSpice does not support this, but I wanted to bounce this off of some other people first. Is it possible to step 2 parameters together? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. It would take time to add and adjust values using the .step list method. communities including Stack Overflow, the largest, most trusted online community for developers learn, share their knowledge, and build their careers. 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. The voltage waveforms of OUTPUT appear on the graph pane. This command causes an analysis to be repeatedly performed while stepping the temperature, a model parameter, a global parameter, or an independent source. I have an LCR circuit including voltage sources where I need to sweep more than three parameters (nested sweep) for a transient simulation. This is useful for associating a name with a value for the sake of clarity and parameterizing sub circuits so . I cannot use Monte Carlo since the cursor information is missing (i.e. Perform parametric analysis using the schematic in the following article. You need to replace this with your parameter designator; put that inside {} brackets, e.g. Google searching for SCR SPICE models, I found a SPICE file on EDN's website. Thanks Ian.M, i tried it but cant seem to get it to work. I'm trying to learn about varying device parameters in LTSpice by setting up a potentiometer model so I can vary the rotation percent and see factors change within the circuit. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Will Gnome 43 be included in the upgrades of 22.04 Jammy? Now you can start using the Spice Directive dialogue box (.op Icon top right) and enter your script. How to pass parameters to subcircuits in LTSpice with the include statement? 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. 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). The best answers are voted up and rise to the top, Not the answer you're looking for? 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. communities including Stack Overflow, the largest, most trusted online community for developers learn, share their knowledge, and build their careers. 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. Now I want to take that parameter and apply it to my components. Note: * is used as a comment in SPICE. In that case, the simulation takes too long, advancing more slowly every time, as it would never end. High Side Current Sense Amplifier with Reference and Comparator. Another way to simulate a set of values at the same time is to use the increasing order option of the .step command. #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 way to achieve this is to create a list of desired values to test. But this wouldn't vary the parameters independently. It described a complete circuit, so I extracted just the SCR description. Thankfully, LTSpice generates data when doing a transient analysis with multiple stepping parameters fairly easily. 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}. Now LT spice knows what you're talking about when you start writing your scripts. If you move the keys up and down in your keyboard you will be able to change between all the different answers. 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). The .step command in this case steps the parameter R through the values 10k, 20k and 30k. If you simulate multiple parameters at the same time, LTSpice will compute all possible combinations between those parameters. Thank you. In LTspice parameters are variables that can be reused throughout the schematic. The best answers are voted up and rise to the top, Not the answer you're looking for? I could open up the plot legend that shows the color of each point, but I don't see anywhere to change these settings. 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} The DC operating point, .op simulation doesnt output an answer with respect to time. I would like to simulate those three situations and plot them together. Hope that explanation helps someone else so they're not spending three hours trying to figure out why the code lifted from the examples here may not be working. They are defined with the .op SPICE directive " .param <name> = <value> ". 2: R1 = 1 M\$\Omega\$, R2 = 10 M\$\Omega\$, Sim. Whats the grammar of "For those whose stories they are"? You can change them manually, which will take some time, but you can also set a variable parameter for RL and change its value automatically. Select Transient and enter 10 m for Stop time. I am not sure if my question was well understood (yes I did find other similar posts but no applicable answers). The new topic will begin with this message. By clicking Accept All, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. 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. Parametric analysis is performed simultaneously with transient analysis, AC analysis, DC sweep analysis and so on. Analog Devices is in the process of updating our website. Asking for help, clarification, or responding to other answers. Click on "Simulate" icon bar then "Edit Simulation Cmd" to show the Transient section. Lastly the .op command drives the operation. This is useful if you want to maintain a relation or control some indirect physical property of the design like a current or filter property.
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ltspice step multiple parameters