ltspice step multiple parameters

Thankfully, LTSpice generates data when doing a transient analysis with multiple stepping parameters fairly easily. 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). Lets start by creating a user-defined variable in LTSpice. #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. Figure 1. From the list of options select the desired one. 2023 For example, combine parameter A and parameter B into a new parameter, (A*100+B), and sweep that. Groups.io, Is there a way to have LTspice step multiple parameters as a, --- In LTspice@, "dan.friedrichs" . The .step command causes an analysis to be repeatedly performed while stepping through a model parameter, global parameter or independent source. I've called the parameter Rx: The 1st line defines the steps I want to take as detailed above. You can break that back out into A and B as it executes. Thank you. Therefore, for: .step param A list 1 2. If you simulate multiple parameters at the same time, LTSpice will compute all possible combinations between those parameters. As .tran 10m of dot command appear, place it at an appropriate position. The proper directive for your case would then be: and set the value of the resistors to {R1} and {R2} respectively. Connect and share knowledge within a single location that is structured and easy to search. I am not sure if my question was well understood (yes I did find other similar posts but no applicable answers). .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) which parameter combination corresponds with which waveform). How can I use it? 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. Thankfully, LTSpice generates data when doing a transient analysis with multiple stepping parameters fairly easily. You can break that back out into A and B as it executes. Once you run and view your simulation results in the waveform pane you can review the step information of a particular trace by attaching a cursor (click onto the trace label), using the up and down arrow keys to navigate the steps and then right-clicking onto the cursor to view the step information. In this case, the resistance value is varied from 1k to 10k. I'm just wondering if I can manually change the color settings of the data points. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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. 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. AC Op-amp integrator with DC Gain Control in LTspice, How to handle a hobby that makes income in US. Step a parameter run number, and from it generate the other parameter values required : Code: [Select] .step param run 1 3 1 ; middle no. In this article, we will explain in detail the parametric analysis(.step) method in LTspice. of runs parameter combination) was used for each simulation. 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. I would for example like to increase some capacitor and decrease the stimulus volrtage source simultaniously. After running the simulation, you can iterate through all the answers the same way as we did in Figure 6 and 7. 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. I would for example like to increase some capacitor and decrease the stimulus volrtage source simultaniously. Visit Stack Exchange Tour Start here for quick overview the site Help Center Detailed answers. For more information on how to use the .step command to improve your understanding of a schematic, review the Help Topics in LTspice IV. Lets use the circuit below as our first example: Lets say we want to analyze the output voltage (Vo) for several different values of a load resistor (RL). The .step command is then used to step R through different values. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? Now lets change the values of RL automatically and analyze the results. and what would happen then? parameters through use of the Component Attribute Editor. It is performed simultaneously with transient analysis, AC analysis, DC sweep analysis, etc. 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. Subscribe today! The voltage waveforms of OUTPUT appear on the graph pane. L: Place inductor. Parametric analysis analyzes while changing parameters such as resistance, capacitor, inductor, and power supply of electronic circuit. The ".step" of dot command appears, so place it at an appropriate position. This time, we set up transient analysis to be performed simultaneously with parametric analysis. Thanks for weighing in! For multiple lines in the "op" editor window use CTRL+M to keep all params in same textbox. Would the magnetic fields of double-planets clash? posted on January 25, 2022. Run the simulation and you should get the same results as in Figure 3. Setup the transient command as below. Then use that parameter's values to control the other. One parameter sweep/step can control multiple component values through expressions. I managed to do it using the TABLE function for each of the five variables. So I wrote a C++ script to create the tables as (long) text files. In this LTspice requires setting of the signal source when simulating. The result would be three simulation runs with C1 matching each of the values specified in the ".step" statement for each run. I'm trying to get the results of simulation in "DC operating point" mode with a few varied (.STEP) parameters (example b. 2. After we finish updating our website, you will be able to set your cookie preferences. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. It's important to have all .step commands in one text box. If you just want to simulate the 3 scenarios I wouldn't bother doing it with spice. However, to my knowledge it is not possible to achieve what you asked for. You can set custom plot colors in the preferences. Steps may be linear, logarithmic, or specified as a list of values. As regards your second question, X would be the different indexes that let me access the table's values. 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. 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. A .model statement tells LTspice what parameters to use for modeling semiconductors. You can duplicate this by taking the text at the end of this section and saving it as a file in your LTSpice This includes: harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing. PSPICE is more suited for this but if you are good at scripting, this should be possible to solve in NGSPICE. 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. Visitors have the right to withdraw their consent. Welcome to EE.SE! The .step command in this case steps the parameter R through the values 10k, 20k and 30k. You should now see .tran 10m at the bottom of the screen. rev2023.3.3.43278. Making statements based on opinion; back them up with references or personal experience. Using Kolmogorov complexity to measure difficulty of problems? Its quite a . I've done the trick with the Component Attributes dialogue on both components already. Instead a combination of parameters using SPICE directives needs to be called for help . Example: .step oct v1 1 20 5. The probe cursor indicates which 'key' (i.e. I need to do three transient simulations with different values of certain resistors (conveniently called R1 and R2) in each. For the types of analysis, please see the following article. What is \newluafunction? We are almost there. - jonk Apr 16, 2020 at 4:28 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. In this article, it was placed near source V1. You are missing a comma in the Vac table after the pair 3,200V. LTSpice: How to start the step of a voltage source at a different time in the transient simulation than t=0s? This time, set the feedback resistor R2 of the op-amp. Press question mark to learn the rest of the keyboard shortcuts. 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. 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 can use auxiliary units other than m as shown in the following table. The command ".step" performs parameters sweeps. Click Simulate-Edit Simulation Cmd in the menu bar to open the Edit Simulation Command screen. This time I set the variable to R2, but anything with alphanumeric characters is fine. Something like It described a complete circuit, so I extracted just the SCR description. Now LT spice knows what you're talking about when you start writing your scripts. 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. Something like this: Paul asked how to step two parameters at once. 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. If you simulate multiple parameters at the same time, LTSpice will compute all possible combinations between those parameters. 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. Then use that parameter's values to control the other.

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