ltspice step multiple parameters

This time I set the variable to R2, but anything with alphanumeric characters is fine. A place to ask questions, discuss topics and share projects related to Electrical Engineering. I've created a .asc file with basically two resistors in it offering 3 terminals and with their values defined as R* (Val/100) and R* (1-Val/100) based on parameter Val . 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. Figure 1. The way to do this is with a single .STEP command. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? 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 In this article, it was placed near source V1. Yes I realized that immediately after sending. Thanks Ian.M, i tried it but cant seem to get it to work. After we finish updating our website, you will be able to set your cookie preferences. rev2023.3.3.43278. One way to achieve this is to create a list of desired values to test. Quick LTSpice question: LTspice plot color settings when stepping Thank you. Is there a way to have LTspice step multiple parameters as a combination? Now lets say that we want to analyze Vo for 10 different types of RL. 2023 So far, we saw how to apply variable parameters to find current and voltages for components that can have multiple values, and use the .tran simulation command to check the answers in terms of time. You should now see .tran 10m at the bottom of the screen. The Thevenin resistance is equal to RL for maximum power, in this case Rth = 12. Is there a single-word adjective for "having exceptionally strong moral principles"? After running the simulation we get the following plot with Vo vs RL. This is the setting for performing a parametric analysis that changes the variable R2 from 100 to 400 ohms in 100 ohm linear steps. We comment the first SPICE directive line and uncomment the second line. Check that SINE is selected and DC offset [V]: 0, Amplitude [V]: 2, Freq [Hz]: 500 is input. LTSpice: Step multiple parameters simultanious | CO.UK edaboard.com Does a summoned creature play immediately after being summoned by a ready action? Perform parametric analysis using the schematic in the following article. I guess I'll just have to export the data and plot it elsewhere. If you simulate multiple parameters at the same time, LTSpice will compute all possible combinations between those parameters. Radial axis transformation in polar kernel density estimate. 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. Read more about our privacy policy. Select Transient and enter 10 m for Stop time. As regards your second question, X would be the different indexes that let me access the table's values. A .param statement can also be placed on a schematic as a SPICE Directive. How to use Slater Type Orbitals as a basis functions in matrix method correctly? 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. Press question mark to learn the rest of the keyboard shortcuts. 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}. Are you sure you wish to delete this message from the message archives of LTspice@groups.io? After much thrashing around, I found there are two aspects to this problem that need to be explored. Lets build the circuit in LTSpice. Create an account to follow your favorite communities and start taking part in conversations. The probe cursor indicates which 'key' (i.e. AC Op-amp integrator with DC Gain Control in LTspice, How to handle a hobby that makes income in US. I think this message isn't appropriate for our group. Setup the transient command as below. 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. LTspice tutorial - Stepping sets of parameters - YouTube 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. I had the sense that LTSpice does not support this, but I wanted to bounce this off of some other people first. LTSpice: How to start the step of a voltage source at a different time in the transient simulation than t=0s? I cannot use Monte Carlo since the cursor information is missing (i.e. 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. This is useful for associating a name with a value for the sake of clarity and parameterizing sub circuits so . This time, set the feedback resistor R2 of the op-amp. Making statements based on opinion; back them up with references or personal experience. After simulation, the graph pane will appear at the top of the schematic with the default settings of LTspice. The proper directive for your case would then be: and set the value of the resistors to {R1} and {R2} respectively. this is how I roll it in 1 run (same method as what mr stilltrying said). The PARAM R can be referenced in a component value usng {R} notation. 2022-06-30; It is performed simultaneously with transient analysis, AC analysis, DC sweep analysis, etc. More than three nested parametric sweeps in LTspice 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 implement this in LTspice, perform the following steps: Figure 1. ECE 202 - Tutorial: LTspiceParamterSweep - Min H. Kao Department of How can I use it? 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. Asking for help, clarification, or responding to other answers. If you have not drawn a schematic with LTspice, we recommend that you draw a schematic before analysis. How to pass parameters to subcircuits in LTSpice with the include statement? Thanks Andy. 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. Firstly, The parameter you wish to vary needs to be designated. In this post (. He holds a Master of Science degree in electrical and computer engineering from University of California, Santa Barbara. vegan) just to try it, does this inconvenience the caterers and staff? Input Name of parameter to sweep: R2, Nature of sweep: Linear, Start value: 100, Stop value: 400, Increment: 100. So I wrote a C++ script to create the tables as (long) text files. If you simulate multiple parameters at the same time, LTSpice will compute all possible combinations between those parameters. The .step command in this case steps the parameter R through the values 10k, 20k and 30k. Make sure that the SPICE directive is selected, enter the dot command syntax (.tran 10m in this case), and click OK to place the created dot command. If you move the keys up and down in your keyboard you will be able to change between all the different answers. Learn more about Stack Overflow the company, and our products. LTSpice: Step multiple parameters simultanious - Electronics Forums Interested in the latest news and articles about ADI products, design tools, training and events? Press keyboard letter "T" to show the spice directive. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Example: .step oct v1 1 20 5. A .model statement tells LTspice what parameters to use for modeling semiconductors. Doesn't analytically integrate sensibly let alone correctly. After placement, right-click ".step" of the mouse to open the ".step Statement Editor" screen. This article details how to use LTspice's Waveform Viewer. You are missing a comma in the Vac table after the pair 3,200V. Groups.io. Step-by-step explanation lStep 1: Plot for step 6-7 Step 2: Plot for step 7-8 Step 3: Plot for step 9 Step 4: Plot for step 10 Step 5: Plot for step 11 Step 6: Plots for step 12 Step 7: Plot for step 13 Step 8: Plot for step 14 Crossing point: Frequency=336.5 Hz, Magnitude =695.218mV, Phase =44.09 o Then you use .include and .step param and the TABLE function in LTspice to perform the sweeps. The voltage waveforms of OUTPUT appear on the graph pane. Something like Multiple; T: tera: 10 12: G: giga: 10 9: Meg: mega: 10 6: k: kilo: 10 3: m: milli: 10-3: u: micro: 10-6: n: nano: 10-9: p: pico: 10-12: f: femto: 10-15: . 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). posted on January 25, 2022. Welcome to EE.SE! 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! If you want to lay out the schematic editor and graph pane, see the following . 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. It is performed simultaneously with transient analysis, AC analysis, DC sweep analysis, etc. Dot command can be created with Edit Text on the Schematic. Now lets change the values of RL automatically and analyze the results. Notice Uin could be used as {Uin} in a voltage source or similar and so on. I would for example like to increase some capacitor and decrease the stimulus volrtage source simultaniously. Here is an example waveform response of an RC circuit, for which the capacitance is stepped through three values. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Use MathJax to format equations. This is useful for associating a name with a value for the sake of clarity and parameterizing your circuits. Interested in the latest news and articles about ADI products, design tools, training and events? In this article, we will briefly introduce the types of analysis that can be performed with LTspice. 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. Remember that R5 relates to the parameter designator. 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 specialty shows in the expression 1-u(Temp) in the last line. The new topic will begin with this message. The addition of the curly braces around the variable is important as it tells LTspice IV that X is a parameter. The command .step performs parameters sweeps. Run the simulation and you should get the same results as in Figure 3. I would for example like to increase some capacitor and decrease the stimulus volrtage source simultaniously. First, prepare a schematic for parametric analysis with LTspice. ltspice - How to use .step param with more than two parameters in Can I specify that it should only change color when stepping one of the parameters? Lets build the LTSpice circuit with the original RL value first. LTspice parametric sweep: how to force the simulator to continue with the next step? In addition, since the schematic was prepared here, if you want to start analysis immediately, download it by clicking the link below. Would the magnetic fields of double-planets clash? In LTSpice the table command really creates a kind of dictionary where you have to specify key value pairs. 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. Thankfully, LTSpice generates data when doing a transient analysis with multiple stepping parameters fairly easily. It only takes a minute to sign up. Does the LT Spice monte carlo simulation definitely output the max and min voltage for any number of simulation runs? Click "SPICE Directive" on the toolbar to display "Edit Text on the Schematic" screen. From the list of options select the desired one. I think this violates the Terms of Service. #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. I'm trying to get the results of simulation in "DC operating point" mode with a few varied (.STEP) parameters (example b. They are defined with the .op SPICE directive " .param <name> = <value> ". Is there a trick I can use to overcome the 'up to three nested loops' limitation? In this LTspice requires setting of the signal source when simulating. The .param directive allows the creation of user-defined variables. 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. 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. PDF Creating Subcircuits and Hierarchical Blocks in LTspice However, to my knowledge it is not possible to achieve what you asked for. 2: R1 = 1 M\$\Omega\$, R2 = 10 M\$\Omega\$, Sim. Can be one line. Click Simulate-Edit Simulation Cmd in the menu bar to open the Edit Simulation Command screen. Finally to find the answer to b), lets have both circuits side to side with RL = 8, LTspice: Using the .STEP Command to Perform Repeated Analysis. The .step command causes an analysis to be repeatedly performed while stepping through a model parameter, global parameter or independent source. 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. Of course, it does not matter if you enter 0.01 instead of 10m without using auxiliary units. In this article, we will introduce the "Initial Settings" when installing the latest version of LTspice XVII. 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. communities including Stack Overflow, the largest, most trusted online community for developers learn, share their knowledge, and build their careers. LTspice - Resistor value controlled by on/off switch, How can one label a node with more than one name in SPICE/ LTspice. MathJax reference. 1995 - 2023 Analog Devices, Inc. All Rights Reserved, LTspice: Using the .STEP Command to Perform Repeated Analysis. LTspice Tutorial: Part 5 - Simon Bramble 1. LTspice@groups.io | Stepping multiple parameters simultaneously To see the results with respect to time, we need to change the simulation type to .tran, transient analysis.

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