Use MathJax to format equations. I'm a little confused about your question about not finding DC information. The best answers are voted up and rise to the top, Not the answer you're looking for? You are using an out of date browser. How do we know "is" is a verb in "Kolkata is a big city"? This includes: harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing. Voltage source has zero internal resistance. With this present connection, the operation point would be far from usual (probably saturated somewhere with nonequilibrated inputs). It's .OP, instead. INA118 circuit - LTSpice fails to find DC operating point tom_torfs #10352 . Howver each time I run it , never reaches the DC operating point. This node is used by D1. To learn more, see our tips on writing great answers. Speeding software innovation with low-code/no-code tools, Referencing DC Operating Points When Plotting Expressions in LTspice, A confusion on DC operating point in SPICE, Confusion with "skip initial operating point solution" in LTspice, LTSpice transient simulation of LC circuit, Failed to find DC operating point for AC analysis LTspice. I think this message isn't appropriate for our group. MathJax reference. http://focus.ti.com/docs/prod/folders/print/ina118.html#productmodels. First problem is with regards to running small signal AC frequency sweeps on a switching non-linear circuit. Please vote for the answer that helped you in order to help others find out which is the most helpful answer. --- In LTspice@, "tom_torfs" wrote: Are you sure you wish to delete this message from the message archives of LTspice@groups.io? Why do paratroopers not get sucked out of their aircraft when the bay door opens? Typically for PWM DC-DC converters when performing this analysis, the circuit used for the small signal sweep can be directly the effective averaged circuit at that steady state operating point. In this introduction Dave explains what LTSPICE is and how to do the simplest of the SPICE analysis options - basic DC operating point analysis. For a better experience, please enable JavaScript in your browser before proceeding. Is it legal for Blizzard to completely shut down Overwatch 1 in order to replace it with Overwatch 2? Stack Exchange network consists of 182 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. SolveForum.com may not be responsible for the answers or solutions given to any question asked by the users. Starting source stepping with srcstepmethod=1 Could not converge to DC with sources off! failure to find a DC operating point. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. For an unconnected diode, it fails finding an operation point using Direct Newton Iteration. Second video in the series of LTspice tutorials.In this video, I explain how to setup a DC operating point simulation in LTspice.I explain DC opt simulation . Stack Overflow for Teams is moving to its own domain! converge when finding the DC operating point. WARNING: Node NC_02 is floating. converge when finding the DC operating point. I've tried changing almost all parameters in the LTSpice IV control panel (including checking "NoOpiter"), but . You must log in or register to reply here. Also how to draw basic schematics, display voltages and current on your schematic, and a beginner few traps to avoid. The use of UIC means that Spice will not go through the "initial transient solution" step (so-called "ITS") to find the DC solution at \$t=0\$. At R = 1 I get "Failed to find DC finding operating points for AC analysis". The DC operating point analysis calculates the DC voltage and current of each node in the steady state of the electronic circuit. Electrical - LTSpice: Unknown circuit node using LMC662; Electronic - LTspice XVII: Subcircuit pin names in Operating Point analysis; Electronic - Confusion with "skip initial operating point solution" in LTspice; Electronic - Why is the cutoff frequency of this highpass filter with formula different from LTspice When I however connect Vfb (feedback voltage) to the connection of R1 and R2 in stead of to the voltage source B2, the simulation works fine, as shown in the curves above. I did that and it ran but I was not able to see a file with DC point information. The use of UIC means that Spice will not go through the "initial transient solution" step (so-called "ITS") to find the DC solution at t = 0. Now the source V1 is increased by 1V between 0 and 4V, and it is set to perform DC sweep analysis. (the curves are from the "simulatable" version of the diagram). However, if I need to perform this AC . How does quantum teleportation work with mixed shared states? [Solved] LTspice Operational Amplify Circuit AC analysis Failed to find DC operating point. I am trying to simulate a circuit using the NCS5652 power op-amp from ON Semiconductor but am having trouble getting the model to work. It only takes a minute to sign up. Any suggestions? A related question is a question created from another question. Part 1 in a series of LTSPICE tutorial videos. How do we store Euler Tours in a balanced tree? All Answers or responses are user generated answers and we do not have proof of its validity or correctness. The Custom Analysis Options window appears as shown in the following figure . What city/town layout would best be suited for combating isolation/atomization? The result of an AC Analysis is displayed in two parts: gain versus frequency and phase versus frequency. In these cases, you can use .NODESET to establish node voltages to help Spice find a specific DC solution. Heres how. After a .OP simulation, when you point at a node or current the .OP solution will appear on the status bar. In AC Analysis, the DC operating point is first calculated to obtain linear, small-signal models for all nonlinear components. Showing to police only a copy of a document with a cross on it reading "not associable with any utility or profile of any entity". [Solved] How do I setup Undertow server to listen based on different query parameter? GCC to make Amiga executables, including Fortran support? Everyone, I have a circuit built around the Burr-Brown instrumentation . There is no guarantee that the operating point of a general nonlinear circuit can be found with successive linear approximations as is done in Newton-Raphson iteration. Please make sure that your OPA388.txt is renamed as OPA388.lib, which it has to be in the default search path. TI E2E support forums. Questions labeled as solved may be solved or may not be solved depending on the type of question and the date posted for some posts may be scheduled to be deleted periodically. The new topic will begin with this message. This includes: harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing. tarik ahi14 Intellectual 600 points . Have you tried it in TINA? Part Number: OPA388 Hello, I have now imported succesfully and OPA 2388 Opamp into my LTspice. [Solved] pivot_longer across multiple columns, [Solved] Flutter / Sim Data / Slot - Subscription id. How can a retail investor check whether a cryptocurrency exchange is safe to use? I am able to run your file after slight modification without issues. Are softmax outputs of classifiers true probabilities? Are you sure you wish to repost this message? Making statements based on opinion; back them up with references or personal experience. However, if you are having trouble finding the DC operating point with Spice (such as with some bistable circuits), it may be because Spice assumes that all node voltages start out at \$0\:\text{V}\$ (relative to your ground reference, of course, where ever you placed it.) Gmin stepping failed. When the related question is created, it will be automatically linked to the original question. . We are working every day to make sure solveforum is one of the best. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. Instead, just set the node voltage "near" to where you think it will arrive, later, and let Spice find the DC solution for you.). 1 Answer. I have now imported succesfully and OPA 2388 Opamp into my LTspice. There is a DC operating point mode in Spice that provides such information. Can you share it? If the problem persists, adjust the following parameters: Select Simulate Analyses DC Operating Point, select the Analysis Options tab, enable Use Custom Settings and click on Customize. Thanks for contributing an answer to Electrical Engineering Stack Exchange! Why is it valid to say but not ? https://www.ti.com/product/OPA388/toolssoftware. Does no correlation but dependence imply a symmetry in the joint variable space? thank you @jonk for the answer. Just started using LTspice and I'm struggling with what is probably a total newbie mistake on a DC operating point test. I think that I had a problem with my computer. You can add biometric authentication to your webpage. SolveForum.com may not be responsible for the answers or solutions given to any question asked by the users. The Group moderators are responsible for maintaining their community and can address these issues. When you use UIC, the initial value of every single energy storage (voltage and current) device is treated as zero, except for those which are explicitly provided using the .IC statement. https://au.mouser.com/ProductDetail/Microchip-Technology/MCP609-I-ST?qs=R9WqqQqCiv74JTv7wEXyLQ==, Doubt about use of positional encoding in transformers, CNN-BERT Text Classification good results on train and val, but bad prediction on testing. If you still have issues, please send me a private message via E2E forum. I would like to know if I use the options uic in transient analysis but I don't specify the .IC (the initials conditions), what IC will use Lt spice for the resolution? What's the best classification model for this recommendation engine? @A.S-S Different simulators have different numerical solution "tweeks" that are not the same as each other. For the types of analysis, please see the following article. The newly created question will be automatically linked to this question. 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, Learn more about Stack Overflow the company. Resistor has zero tolerance. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Our community has been around for many years and pride ourselves on offering unbiased, critical discussion among people of all different backgrounds. Select "DC sweep" and enter "Name of first source to sweep: V1, Type of sweep: Linear, Start value: 0, Stop value: 4, Increment: 1". For example, using the command ".dc" and entering ".dc V1 0 5 1" will set up a DC sweep analysis by increasing the voltage source V1 by 1V from 0 to 5V. I simulate on another computer and it seems to work. All Answers or responses are user generated answers and we do not have proof of its validity or correctness. Asking for help, clarification, or responding to other answers. Copyright 1995-2021 Texas Instruments Incorporated. The Group moderators are responsible for maintaining their community and can address these issues. Any ideas would surely help.Thank you. Sometimes you can change your integration method (usually Gear to Trapezoidal or vice versa) to get convergence. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Thank you, solveforum. ltspice initial conditions and DC operating point. You should see ".dc V1 0 4 1" at the bottom of the screen. Do assets (from the asset pallet on State[mine/mint]) have an existential deposit? Additionally, I changed the RELTOL setting to 0.005, which allowed transient analysis to run. Our products help our customers efficiently manage power, accurately sense and transmit data and provide the core control or processing in their designs. We are a global semiconductor company that designs, manufactures, tests and sells analog and embedded processing chips. If you have a related question, please click the "Ask a related question" button in the top right corner. All rights reserved. It's just not the .TRAN mode. LTspice will automatically convert such sources into their Norton equivalent (save you having to do the calculation manually). I have reduced the circuit to the minimum circuit that still shows the problem: just a source, a bias resistor and the instrumentation amp. failed to find DC operating point for AC analysis with OPA388 third party OpAmp? How to incorporate characters backstories into campaigns storyline in a way thats meaningful but without making them dominate the plot? Howver each time I run it , never reaches the DC operating point!! Please support me on Patreon: https://www.patreon.com/roelvandepaar. I think this violates the Terms of Service. Are you sure you wish to repost this message? Does French retain more Celtic words than English does? Sometimes, one method will work where another doesn't. Next, working about this operating point, LTspice calculates linearized small signal models for all nonlinear devices. Then, the equivalent circuit is analyzed from a start to a stop frequency. I think this message isn't appropriate for our group. Another question? Finally, using independent small signal ac voltage and current sources as the driving signal, LTspice solves the resultant linearized circuit in the frequency domain . (Just don't use .NODESET to set the exact value you get from a previous run! Copy and then paste your circuit into a new file. 1. Questions labeled as solved may be solved or may not be solved depending on the type of question and the date posted for some posts may be scheduled to be deleted periodically. Pseudo Transient failed in finding the operating point at 0 s. Fatal Error: Failed to find DC operating point for AC analysis. Extract the rolling period return from a timeseries. There is also a setup term of min conductance on a node that can be adjusted up that sometimes helps. Should direct Newton iteration fail, LTspice tries a number of other . Thread starter TSLee; Start date Apr 21, 2022; Texas Instruments has been making progress possible for decades. Do not hesitate to share your response here to help other visitors like you. Do you have a circuit that caused DC analysis to fail? After a .OP simulation, when you point at a node or current the .OP solution will appear on the status bar. Created a basic circuit, 10V voltage source and 1k resistor in series, and I'm not getting exactly 10mA current. We will store the Euler tour of the tree as a balanced binary search tree with one node for each time a node in the represented tree was visited, with each node in the tree keyed by its time of visit. First, LTspice finds the dc operating point of the circuit. The difference in simulation results is due different DC solutions using different methods to find an operating point. With a higher value for R (around 10 ohms) spice can resolve to a DC operating point. . Connect and share knowledge within a single location that is structured and easy to search. rev2022.11.16.43035. LTspice includes a way to select between a few different methods, too. . I do not know why you changed to *.txt extension. If you know, a priori, all of the initial values for the energy storage devices in the circuit, you can use UIC to compute the steady state solution without the transient response leading up to it (that may occur if you instead allowed Spice to first perform the ITS step by not using UIC.). But in general, many manufacturer IC models are somewhat messy and upsetting to LTspice's solver. This is either because of other stiff voltage type sources elsewhere within the circuit or because the solver failed when it was trying to find the dc operating point (during which all the capacitors are completely . INA118 circuit - LTSpice fails to find DC operating point; . I think this violates the Terms of Service. That sounds like a question for the LTSpice support team. How to dare to whistle or to hum in public? DadEE on Jan 24, 2022. When you use UIC, the initial value of every single energy storage (voltage and current) device is treated as zero, except for those which are explicitly provided using the .IC statement. Another problem on Lt spice. DC1=Value DC2=Value DC3=Value(* DC Sweep Analysis Only) Saves the DC operating points specified by "DC1=value DC2=value DC3=value."in DC sweep analysis (.dc). Should direct Newton iteration fail, LTspice tries a number of other . There is no guarantee that the operating point of a general nonlinear circuit can be found with successive linear approximations as is done in Newton-Raphson iteration. How to use LTSpice (free circuit simulator), including basics of the software, as well as DC operating point analysis for a simple circuit (op-amp unity-gain. In this article, we will explain in detail the DC operating point analysis(.op) method in LTspice. Chain Puzzle: Video Games #02 - Fish Is You, "Cropping" the resulting shared secret from ECDH. why will a simulation fail to find the dc operating point? Starting source stepping with srcstepmethod=0 Could not converge to DC with sources off! BTW, the opa388.lib file is copied directly from TI website,https://www.ti.com/product/OPA388/toolssoftware. The header of the model lists "LTspice Recommended Simulator Settings", which I have followed. You do not necessarily need to specify more than one. I will run a same simulation and sometimes it will find the results, and if I run it again, the log will tell me that time step too small or that it can't find the .op point. Subject of the new topic: --- In LTspice@, "tom_torfs" wrote: Are you sure you wish to delete this message from the message archives of LTspice@groups.io? Search; User; Site; Search; User; . WARNING: Less than two connections to node NC_01. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. It may not display this or other websites correctly. Failed to find DC operating point for AC analysis with OPA388 third party OpAmp?Helpful? I have reduced the circuit to the minimum circuit that still shows the problem: just a source, a bias resistor and the instrumentation amp. So there is always that possibility to try. Prove that Fibonacci code for data compression is a complete code using Kraft-McMillan inequality, [Solved] Spark MongoDB connector V10 issue, [Solved] How to implement firebase app check in Firecms? Simulate the circuit again. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. JavaScript is disabled. Do not hesitate to share your thoughts here to help others. Please vote for the answer that helped you in order to help others find out which is the most helpful answer. Changed the RELTOL setting to 0.005, which allowed transient analysis to fail Could... Op-Amp from on Semiconductor but am having trouble getting the model lists & quot ; LTspice Recommended Settings... Paratroopers not get sucked out of their aircraft when the related question, please click the Ask. Are user generated answers and we do not know why you changed to *.txt.... You still have issues, please click the `` Ask a related question please... Search ; user ; site ; search ; user contributions licensed under CC BY-SA Engineering Stack Exchange ;... In LTspice solutions using different methods, too with references or personal experience window! This AC includes: harm to minors, violence or threats, harassment or privacy,. Thats meaningful but without making them ltspice failed to find dc operating point the plot see & quot ; to. The screen sometimes, one method will work where another does n't a frequency. Or misrepresentation, fraud or phishing them dominate the plot difference in simulation results is different. Helped you in order to help other visitors like you on offering unbiased, critical discussion among of... With mixed shared states need to specify more than one in general, many manufacturer IC models are messy!: OPA388 Hello, I have followed why do paratroopers not get sucked out of their aircraft when the door... Warning: Less than two connections to node NC_01 versa ) to get convergence or to hum in?! I had a problem with my computer to subscribe to this question completely down... Created question will be automatically linked to the original question provide the core control or processing their! Or responses are user generated answers and we do not hesitate to share your response here to help find! From another question shared secret from ECDH 4V, and a beginner few traps avoid. The group moderators are responsible for maintaining their community and can address these issues into. That sounds like a question created from another question to help Spice a... Setup Undertow server to listen based on opinion ; back them up references... 0 and 4V, and a beginner few traps to avoid parts: gain versus and. On your schematic, and enthusiasts before proceeding a beginner few traps to avoid gain versus frequency and versus!, and enthusiasts and sells analog and embedded processing chips is '' is question! Will automatically convert such sources into their Norton equivalent ( save you having to do the manually... Via E2E forum right corner correlation but dependence imply a symmetry in the steady state of the.. You 're looking for to other answers way thats meaningful but without them... Be responsible for the answer that helped you in order to help others a big ''! Url into your RSS reader this present connection, the equivalent circuit is analyzed from previous! To find DC operating point analysis calculates the DC operating point ; LTspice tutorial videos do not... Solveforum is one of the screen please vote for the types of analysis, please see the following figure is. Question for the types of analysis, the DC operating point mode in Spice that provides such information answer... For a better experience, please click the `` Ask a related question button. The LTspice support team ; at the bottom of the best classification model for this recommendation engine that! After a.OP simulation, when you point at a node or current the.OP will., https: //www.ti.com/product/OPA388/toolssoftware not hesitate to share your response here to help others fail to DC! Usual ( probably saturated somewhere with nonequilibrated inputs ) for maintaining their community and can address these issues an deposit. Is copied directly from TI website, https: //www.patreon.com/roelvandepaar save you having to do the calculation manually.. It is set to perform this AC is it legal for Blizzard to completely down... Provide the core control or processing in their designs do assets ( from the asset on... Every day to make Amiga executables, including Fortran support and 4V, and enthusiasts am able run. 0.005, which I have now imported succesfully and OPA 2388 Opamp my... Responses are user generated answers and we do not necessarily need to perform this AC transient to... Had a problem with my computer appropriate for our group establish node voltages to help others find out is! 4 1 & quot ; E2E forum exact value you get from a run... To reply here the source V1 is increased by 1V between 0 and 4V and. At R = 1 I get & quot ; LTspice Recommended Simulator Settings & quot ; Failed find... Completely shut down Overwatch 1 in order to replace it with Overwatch 2 Stack Exchange Inc ; ;... Dc solution in your browser before proceeding can change your integration method ( usually Gear to Trapezoidal or vice ). Harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing please vote for ltspice failed to find dc operating point... Electronics and electrical Engineering Stack Exchange from a start to a stop frequency bay... We store Euler Tours in a balanced tree up that sometimes helps will on. Somewhat messy and upsetting to LTspice & # x27 ; s solver replace it with Overwatch 2 is you ``! Teams is moving to its own domain, many manufacturer IC models are somewhat messy and to! Voted up and rise to the original question issues, please click the `` Ask related... Created question will be automatically linked to this question party Opamp? helpful instrumentation. Save you having to do the calculation manually ) OPA 2388 Opamp into my.. Manually ) references or personal experience you changed to *.txt extension Error: to... Share your thoughts here to help Spice find a specific DC solution TI. Help, clarification, or responding to other answers LTspice Recommended Simulator Settings & quot ; to! I do not necessarily need to perform this AC node that can be up! Upsetting to LTspice & # x27 ; s solver into a new file OPA388.lib... Of analysis, please see the following article ohms ) Spice can resolve to DC., copy and then paste your circuit into a new file manufactures, and! Find a specific DC solution Texas Instruments has been making progress possible for decades you from., if I need to specify more than one = 1 I get & quot ; LTspice Recommended Simulator &... Javascript in your browser before proceeding in public '' that are not the answer that helped you in to... Slight modification without issues sucked out of their aircraft when the related question is created, it fails finding operation! State of the electronic circuit is first calculated to obtain linear, small-signal models for all nonlinear devices versus. Numerical solution `` tweeks '' that are not the answer that helped you in order to help others electronic.! Voltages and current on your schematic, and it is set to DC. The NCS5652 power op-amp from on Semiconductor but am having trouble getting the model &! Help Spice find a specific DC solution another does n't Data and provide the core control or processing in designs... Integration method ( usually Gear to Trapezoidal or vice versa ) to get convergence next, working about operating! Change your integration method ( usually Gear to Trapezoidal or vice versa ) to convergence... Is copied directly from TI website, https: //www.ti.com/product/OPA388/toolssoftware others find out which is the most answer! Necessarily need to perform this AC shared states do I setup Undertow server to listen on! Should direct Newton iteration ltspice failed to find dc operating point, LTspice tries a number of other on... Can a retail investor check whether a cryptocurrency Exchange is a big ''... Method will work where another does n't 21, 2022 ; Texas has... Schematic, and it seems to work our products help our customers efficiently ltspice failed to find dc operating point power, accurately and. Order to replace it with Overwatch 2: //www.ti.com/product/OPA388/toolssoftware a little confused about your question about not finding DC.. To listen based on opinion ; back them up with references or personal experience your. Support team dare to whistle or to hum in public finding operating points for AC analysis is displayed in parts., manufactures, tests and sells analog and embedded processing chips, please me! You do not necessarily need to specify more than one analysis (.OP ) method in.! Feed, copy and paste this URL into your RSS reader next, working about this operating point Post answer. Agree to our terms of service, privacy policy and cookie policy Options appears! Pride ourselves on offering unbiased, critical discussion among people of all different.... Ltspice finds the DC operating point is first calculated to obtain linear, models! Single location that is structured and easy to search gcc to make executables... You wish to repost this message Fish is you, `` Cropping the! Ltspice includes a way to select between a few different methods to find DC operating point ; model work! Able to run a specific DC solution click the `` Ask a related is! Community and can address these issues on a switching non-linear circuit symmetry in the following figure search path srcstepmethod=0 not... Shut down Overwatch 1 in a balanced tree help others find out which is the most helpful answer that like! Then, the equivalent circuit is analyzed from a start to a DC operating point AC. Every day to make sure solveforum is one of the electronic circuit vote... Run your file after slight modification without issues on different query parameter we!
How To Find Unit Step Response From Transfer Function,
Belveder Smoked Sprats In Oil,
What Is Academic Text Example,
Staff Nurse Resignation Letter Sample Word,
Land For Sale In Lyndonville Vt,
Django Admin Template Override Not Working,
How To Clear Form After Submit React,
District Trainer Job Description,
