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! In LTspice parameters are variables that can be reused throughout the schematic. Andy More All Messages By This Member Andy I #129250 Example:.step param x list 0 1 2 3 4 5.param y={x}or.param y=table(x,+ 0, 5,+ 1, 7,+ 2, 18,+ 3, 22,+ 4, -6,+ 5, 5)or whatever. For How to set up detailed transient analysis. #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 confused, do you want to simulate 3 situations or more? 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. This includes: harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Here is a list of some hotkeys for creating your schematic: R: Place resistor. AC Op-amp integrator with DC Gain Control in LTspice, How to handle a hobby that makes income in US. Below is a step-by-step method for how I added one. 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. It is provided free of charge by Analog Devices (originally by Linear Technology). 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. Disconnect between goals and daily tasksIs it me, or the industry? The simulation time varies depending on the size of the circuit. LTspice IV: Using the .STEP Command to Perform Repeated Analysis. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? One parameter sweep/step can control multiple component values through expressions. Therefore, for: .step param A list 1 2. It is important to understand that if you place the ground reference in a different point you are going to get different results. Asking for help, clarification, or responding to other answers. The Group moderators are responsible for maintaining their community and can address these issues. One parameter sweep/step can control multiple component values through expressions. After simulation, the graph pane will appear at the top of the schematic with the default settings of LTspice. To be clear I've used {R5} for my convenience and understanding. Why does LTspice XOR gate have more than two inputs? 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. Now lets say that we want to analyze Vo for 10 different types of RL. rev2023.3.3.43278. 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. {R5} then Save. The specialty shows in the expression 1-u(Temp) in the last line. (I.e. 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} Click Simulate-Edit Simulation Cmd in the menu bar to open the Edit Simulation Command screen. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 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. A .model statement tells LTspice what parameters to use for modeling semiconductors. Instead a combination of parameters using SPICE directives needs to be called for help . Then use that parameter's values to control the other. Subscribe today! 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. Lets build the circuit in LTSpice. One of those flavors is the ability to include a list of values for your variable name. 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 For the types of analysis, please see the following article. communities including Stack Overflow, the largest, most trusted online community for developers learn, share their knowledge, and build their careers. The .param directive allows the creation of user-defined variables. Steps may be linear, logarithmic, or specified as a list of values. Open the Independent Voltage Source screen by right-clicking the signal source V1 of the schematic with the mouse. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Interested in the latest news and articles about ADI products, design tools, training and events? LTSpice doesn't know what your talking about until you do that bit. I had the sense that LTSpice does not support this, but I wanted to bounce this off of some other people first. LTspice - Resistor value controlled by on/off switch, How can one label a node with more than one name in SPICE/ LTspice. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Thanks Ian.M, i tried it but cant seem to get it to work. flower arranging classes northern virginia. Are you sure you wish to delete this message from the message archives of LTspice@groups.io? Step independent voltage source V1 from 1 to 20 logarithmically with 5 points per octave. I am not sure if my question was well understood (yes I did find other similar posts but no applicable answers). did phineas and ferb die in a car accident. To understand the LTspice Model Parameters of Components we shall first understand the .param directive used in LTspice simulation software. The addition of the curly braces around the variable is important as it tells LTspice IV that X is a parameter. vegan) just to try it, does this inconvenience the caterers and staff? http://tech.groups.yahoo.com/group/LTspice/files/%20Tut/Stepping%20to%20the%20max/. This is useful for associating a name with a value for the sake of clarity and parameterizing your circuits. Check that SINE is selected and DC offset [V]: 0, Amplitude [V]: 2, Freq [Hz]: 500 is input. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? It described a complete circuit, so I extracted just the SCR description. It is performed simultaneously with transient analysis, AC analysis, DC sweep analysis, etc. 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. You can break that back out into A and B as it executes. For example, combine parameter A and parameter B into a new parameter, (A*100+B), and sweep that. 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 and what would happen then? Visitors have the right to withdraw their consent. into the resistor value field. 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. Another way to simulate a set of values at the same time is to use the increasing order option of the .step command. 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. The LTSPICE function u(x) is a step function with u(x)=1 for x > 0 and u(x)=0 else. Gabino Alonso is currently the director of strategic marketing for the Power by Linear Group. 1: R1 = 1 k\$\Omega\$, R2 = 10 k\$\Omega\$, Sim. In this article, we will introduce the "Initial Settings" when installing the latest version of LTspice XVII. If you plot multiple signals LTSpice will then plot each trace in a different color but each step for this signal in the same color. How to pass parameters to subcircuits in LTSpice with the include statement? Now lets change the values of RL automatically and analyze the results. 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. Subscribe today! 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 LTspice is a powerful and widely used SPICE simulation application. Thank you. rev2023.3.3.43278. 2023 Now you can start using the Spice Directive dialogue box (.op Icon top right) and enter your script. We are commenting the second Spice directive for now. The general idea (not the implementation) came from the LTspice yahoo group (e.g. Thanks Andy. Perform parametric analysis using the schematic in the following article. The .step command in this case steps the parameter R through the values 10k, 20k and 30k. Prior to joining ADI, Gabino held various positions in marketing, engineering, operations, and education at Linear Technology, Texas Instruments, and California Polytechnic State University. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Whats the grammar of "For those whose stories they are"? Confirm that ".step" of the dot command is displayed as ".step param R2 100 400 100". Note: To download the simulation files provided in this article, the reader must have LTSpice installed. This could be a case of you get what you pay for. Learn more about Stack Overflow the company, and our products. 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. G: Place ground. Can I have two (or more) different symbols for the same LTspice schematic? As .tran 10m of dot command appear, place it at an appropriate position. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The .step command causes an analysis to be repeatedly performed while stepping through a model parameter, global parameter or independent source. Groups.io. The waveform viewer is a function that displays the simulation results executed with LTspice as a LTspice-Independent Voltage Source Setting. Something like After placement, right-click ".step" of the mouse to open the ".step Statement Editor" screen. Will Gnome 43 be included in the upgrades of 22.04 Jammy? As regards your second question, X would be the different indexes that let me access the table's values. Normally, LTspice sets the resistance element parameter to a constant such as R = 10. Its quite a . We have already set the signal source in the article of "How to Draw a Schematic", but let's check it just in case. To plot a specific answer, right click on the graph, go to View and select Select Steps. For multiple lines in the "op" editor window use CTRL+M to keep all params in same textbox. Welcome to EE.SE! Thanks for contributing an answer to Electrical Engineering Stack Exchange! 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}. I've done the trick with the Component Attributes dialogue on both components already. For this exercise, we have 2 variable parameters, Vs and R, which gives a total of 4 possible solutions. After we finish updating our website, you will be able to set your cookie preferences. communities including Stack Overflow, the largest, most trusted online community for developers learn, share their knowledge, and build their careers. LTspice can use auxiliary units other than m as shown in the following table. ltspice step multiple parameters. It would take time to add and adjust values using the .step list method. For more information on how to use the waveform viewer, see the following articles: The schematic used for the parametric analysis can be downloaded from the link below. I think this message isn't appropriate for our group. LTSpice, command line execution does not generate .raw file CPaul962 on Jan 28, 2020 I have a schematic consisting of a network of resistors, MOSFETs and DC voltage sources which I would like to do DC simulations of. Learn more about Stack Overflow the company, and our products. What sort of strategies would a medieval military use against a fantasy giant? Is there a single-word adjective for "having exceptionally strong moral principles"? What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? Then use that parameter's values to control the other. Well for one the table command wants an index, which is X, then a set of xy pairs. 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. 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: . The way to do this is with a single .STEP command. You should now see .tran 10m at the bottom of the screen. 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. 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. .step param B list 3 4. I think this violates the Terms of Service. In that case, the simulation takes too long, advancing more slowly every time, as it would never end. For more information on how to use the .step command to improve your understanding of a schematic, review the Help Topics in LTspice IV. 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. To see the results with respect to time, we need to change the simulation type to .tran, transient analysis. High Side Current Sense Amplifier with Reference and Comparator. In the "op" command editor you can enter something like this: It steps Imax from 0.1 to 0.3 in steps of 0.1 and computes a resistor value R using parameter Imax, Uin, some assumed voltage drop 0.85.. of a diode. Why is this sentence from The Great Gatsby grammatical? MathJax reference. In this article, we will explain in detail the parametric analysis(.step) method in LTspice. If you preorder a special airline meal (e.g. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? Example: .step oct v1 1 20 5. 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). Something like this: Paul asked how to step two parameters at once. 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. However, with the .step increase order method that can be done faster. https://groups.io/g/LTspice/topic/50201465#60860). Visit Stack Exchange Tour Start here for quick overview the site Help Center Detailed answers. Notice Uin could be used as {Uin} in a voltage source or similar and so on. The probe cursor indicates which 'key' (i.e. 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. Refer to the following article for the detailed setting method of transient analysis. When a temperature sweep is used, LTSpice automatically vary the properties of components with respect to desired temperatures. parameterized capacitance in the R-C circuit It only takes a minute to sign up. 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. LTspice parametric sweep: how to force the simulator to continue with the next step? 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. If you want to lay out the schematic editor and graph pane, see the following . 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? If you move the keys up and down in your keyboard you will be able to change between all the different answers. 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. 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. 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. In this article, it was placed near source V1. What LTSpice does is automatically set each step to have a certain color automatically. I managed to do it using the TABLE function for each of the five variables. Another use of variable parameters can be to find the maximum power transferred to a load. For example, combine parameter A and parameter B into a new parameter, (A*100+B), and sweep that. Create an account to follow your favorite communities and start taking part in conversations. 2023 I cannot use Monte Carlo since the cursor information is missing (i.e. To implement this in LTspice, perform the following steps: Figure 1. 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. It only takes a minute to sign up. Found the answer in the group. I'm trying to get the results of simulation in "DC operating point" mode with a few varied (.STEP) parameters (example b. Press J to jump to the feed. Thanks for contributing an answer to Electrical Engineering Stack Exchange! How do/should administrators estimate the cost of producing an online introductory mathematics class? The Group moderators are responsible for maintaining their community and can address these issues. #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. This command causes an analysis to be repeatedly performed while stepping the temperature, a model parameter, a global parameter, or an independent source. 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. The new topic will begin with this message. The problem was that the size of the tables (given by the number of total parameter combinations) was prohibitive to write by hand. 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. (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). 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. Parametric analysis analyzes while changing parameters such as resistance, capacitor, inductor, and power supply of electronic circuit. 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. Besides, the Monte Carlo will take too long and it may 'duplicate' some combinations. Each param should have 3 pairs in it, not three values. After running the simulation we get the following plot with Vo vs RL. 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. At LTspice, are there any methods to change the values at once? One way to achieve this is to create a list of desired values to test. In this article, we will briefly introduce the types of analysis that can be performed with LTspice. run a simulation immediately. Input Name of parameter to sweep: R2, Nature of sweep: Linear, Start value: 100, Stop value: 400, Increment: 100. The command .step performs parameters sweeps. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? If you just want to simulate the 3 scenarios I wouldn't bother doing it with spice. The only change that we need to make is to add a set of values for the variable parameter RL. Interested in the latest news and articles about ADI products, design tools, training and events? The way to do this is with a single .STEP command. In this LTspice requires setting of the signal source when simulating. Using Kolmogorov complexity to measure difficulty of problems? By computing 1-u(Temp) the temperature coefficient tc3 is effective only if Temp < 0 C. Lets find the value of RL that corresponds to the the maximum power transfer to RL in the circuit from Figure 4. 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 have an LCR circuit including voltage sources where I need to sweep more than three parameters (nested sweep) for a transient simulation. After simulation, when you move the cursor close to the schematic wiring, the cursor changes to voltage probe. Unfortunately, there's no editing messages but I knew whoever responded would be sure to correct me : ). Making statements based on opinion; back them up with references or personal experience. LTSpice: Step multiple parameters simultanious Uwe Bonnes Aug 1, 2006 Aug 1, 2006 #1 U Uwe Bonnes Guest 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. 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 I need to do three transient simulations with different values of certain resistors (conveniently called R1 and R2) in each. Figure 1. of runs In this case, the resistance value is varied from 1k to 10k. this is how I roll it in 1 run (same method as what mr stilltrying said). 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. Note: * is used as a comment in SPICE. Enter {R2} for the Resistance[]. Click SPICE Directive on the toolbar to display Edit Text on the Schematic screen. Add a .step command via a SPICE directive that specifies the steps for the parameter by a linear, logarithmic or list of values. MathJax reference. This time, we set up transient analysis to be performed simultaneously with parametric analysis. In this article, we will explain in detail how to set the simulation command used for the following six types of analysis. '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'. 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. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts.