What is the name of this battery contact type? You can open the Educational folder in the following order : My Documents> LTspiceXVII> examples> Educational. I tried to play around with the Gmin, Abstol, Reltol, and Chgtol parameters in the settings but it didn't work. Sometimes the simulations never finish because they don't reach the right criteria, I want to change the criteria. In order to avoid each output to interfere with the others I had to include an "ideal" diode at each output branch but for low output voltages the output current is almost null when I expect an "appreciable" value. How can I attach Harbor Freight blue puck lights to mountain bike for front lights? Choose from one of our 12 newsletters that match your product area of interest, If you select 1st Source, you can see the V1 settings. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. We will utilize the files provided in the Educational folder. MathJax reference. DC Sweep Analysis(.dc) Setting 1 Click "Simulate"-"Edit Simulation Cmd" in the menu bar to open the "Edit Simulation Command" screen. of runs.param Vac={table(run, 1,254V, 2,264V, 3,274V)}.param Vdc={table(run, 1,1V, 2,2V, 3,3V)} then use SINE(0 {Vac*sqrt(2)} 50) for the AC source and {Vdc} for the DC one. Method 1: Modify Libraries This method makes sense if you are working on your own computer, where you can update your own libraries and use them again. It seems I can't find anything like an edit button or option so I hope I'm not having a dumb moment. Don't thank , but stay aware / pay attention of what are you doing and need to do Are you sure you wish to delete this message from the message archives of LTspice@groups.io? The 'V' units in the table() functions are syntactic sugar - LTspice ignores unit letters after a . .step param run 1 3 1 ; middle no. A step of 0.05V would make more sense. Would drinking normal saline help with hydration? The simulation you have is a DC sweep. A snapshot of the video is available for quick reference: My schematic in LTspice is shown below: For the simulation, I am using DC sweep on voltage source V3, starting from -10 V to 10 V, incrementing by 0.01 V. Regarding the diode, I have picked the first . 4 When was the earliest appearance of Empirical Cumulative Distribution Plots? If so, what does it indicate? ECE 202: Circuits II Parameter Sweeps in LTSpice Parameter sweeps can be a useful tool to examine how circuit operation changes with variation in different passive values, source amplitudes, operating frequency, or any other parameter. I am trying to simulate the gain limiter network shown in this video. Np. If you select 1st Source, you can see the V1 settings. It is used to analyze DC characteristics of diodes, transistors, and op amps. Perform a DC operating point simulation for the amplifiers. I have a circuit that's kind of finicky, I'm trying to run a DC sweep but it takes forever to run simulation steps. The Group moderators are responsible for maintaining their community and can address these issues. !We!can! By the way I checked your .asc file and I understand what you mean. After!drawing!the!schematic!andsetting!the!component!values,!we!canproceedtosimulations. & Reliability, Sales & LTspice parametric sweep: how to force the simulator to continue with the next step? Distribution, Switch The main problem is even after adding circuit elements to make the circuit converge faster\better (like parallel resistance and capacitance on sources, and parasitic capacitance and series source resistance), the circuit still takes a long time and won't stop stepping the source or not converging (I don't know whats going on under the hood). to mobile view, Privacy & From the LTSPice manual, the specific directives are: Direct Newton Iteration: .options NoOpIter, Adaptive Gmin Stepping: .options GminSteps=0, Adaptive Source Stepping: .options SrcSteps=0. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . Do you normally use ALL of your cpu cycles with useful work? I know increasing Gmin value (under Tools, Control Panel, Spice) from originally 1e-012 to 1e-008 as shown fixes your issue but I don't have a clear explanation for why that's the case: There may be information in the link below regarding why this works: http://ltwiki.org/index.php?title=Convergence_problems%3F. This means that V1 is swept in 10mV steps from 0V to 15V. What is an idiom about a stubborn person/opinion that uses the word "die"? stream Asking for help, clarification, or responding to other answers. By shorting Vtest to OUT1, LTspice has to pick one or the other name for that net. The best answers are voted up and rise to the top, Not the answer you're looking for? 2 Select "Misc" and click "OK" or double-click "Misc". It only takes a minute to sign up. Run it overnight while you sleep - or schedule it to run in the background - used to run simulations that took 40 days or more but that was on a Unix system. Thats silly, its eating up CPU cycles doing absolutely nothing. Thanks for contributing an answer to Electrical Engineering Stack Exchange! The first method is direct Newton-Raphson iteration. If that fails, LTSpice will try the following strategies in order by default: Adaptive gmin stepping Adaptive source stepping "Pseudo Transient" From your screen shot, it looks like you are still hung up when you get to adaptive source stepping. Remove symbols from text with field calculator. As mentioned before, some deviation from the hand analysis should not be a surprise. 4 Keith. %PDF-1.3 On all schematics of SparkFun's parts we give you a voltage range for which the product can safely operate. Use MathJax to format equations. PRO918 on May 13, 2021. asc" from within the Educational folder. NO, I want someone to tell me whats going on, and what criteria I can change. ! When I run the simulation profile, stepping source takes too long and never ends. To solve this problem, I'll show you how to perform a DC Sweep analysis using a simulation file that comes with you in a folder called Educational. Stack Overflow for Teams is moving to its own domain! You should see ".dc V1 0 4 1" at the bottom of the screen. The blue underbar in is the setting of the current I1 to flow to the base. When RUN is executed, the I-V curve shown in Figure. My guess is that when you hit escape at that point, you progress to the Pseudo Transient method and get convergence relatively quickly thereafter. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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. Improving LT Spice DC sweep convergence time, Speeding software innovation with low-code/no-code tools, Tips and tricks for succeeding as a developer emigrating to Japan (Ep. I would appreciate any suggestions to solve this issue, as my submission is near around and my instructor didn't provide me with anything helpfulto do. I think this violates the Terms of Service. This means that I1 is changed from 20uA to 100uA in the 20uA steps.. % How did knights who required glasses to see survive on the battlefield? Settings, 1995 - 2022 Analog Devices, Inc. All Rights Reserved. But thanks, it worked finally. When you hit escape during a stalled DC simulation in LTSpice, the simulator progresses to the next solution method. If that fails, LTSpice will try the following strategies in order by default: From your screen shot, it looks like you are still hung up when you get to adaptive source stepping. When I run the simulation profile, stepping source takes too long and never ends. Open the "Simulate" menu and go to "Edit Simulation Cmd". In my circuit I've got three different current sources and I'm respectively doing a DC sweep for their output nodes. 4!! events? I thought it would be a good idea to check a Sparkfun product to see just how accurate those voltage ranges are. The new topic will begin with this message. I tried to play around with the Gmin, Abstol, Reltol, and Chgtol parameters in the settings but it didn't work. As it turns out, LTspice used the names OUT1, OUT2, and OUT3, and ignores the name Vtest (except when it initially traces the connection to voltage source VTEST). 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. How can I get the steps to run back to back so I don't have to babysit the simulation by hitting the ESC key? To examine how to do a parameter sweep, we will consider a simple R-C circuit: R-C circuit used as an example Cant thank you enough. What are the differences between and ? The simulation command is a .TRAN with some arguments. The DC Sweep analysis is configured as follows : The red underline in indicates the setting of the voltage V1 between the collector and the emitter. Subject of the new topic: Andy thank you very much for your aid. Start a research project with a student in my class. Understanding the DC Sweep Flow Using the .DC Statement 8-2 Star-Hspice Manual, Release 1998.2 Understanding the DC Sweep Flow Figure 8-1: DC Sweep Overview Sweep analysis Monte Carlo Sweep range Sweep type Sweep variables start stop increment linear decade octave poi temp isource vsource user-parameters DC-related AC small-signal analysis . I.e. 505), Limiting Current interference in Photomultiplier Amplifier Circuit. LTspice can be downloaded through below URL link. To make it run faster I hit esc because it is done stepping but probably not to the tolerance that some setting requires. DC sweep analysis sweeps the DC voltage of the input signal of the e 3 To set the linear current dependent current source, right-click with the mouse on the schematic symbol and enter "V1" in "SpiceModel" as the voltage source to detect the current and '2' in "Value" as the amplification factor. I tend to use a slow transient analysis with a triangular wave input - it seems easier. Making statements based on opinion; back them up with references or personal experience. This means that V1 is swept in 10mV steps from 0V to 15V. LTSpice is capable of several types of simulation, but today we'll be covering just two: .tran and .AC, which stand for Transient and AC Sweep analysis, respectively. Dialogue, Contact I did not recognized this until you mentioned it and it makes a lot of sense now. The default is 0.1 rather than 1, but I wouldn't expect it to make a big difference. that is, you are sweeping the source VBAT from 4 to 3.2 in steps of 0.5V which does not make a whole lot of sense. If you want to see how a circuit results when the DC voltage is increased, you use a simulation command called .DC All simulation commands are prefixed with a period "." What I'm trying to achieve is plotting the current output vs the voltage output in order to compare both their systematic error and the output impedance quality of each current source.In my circuit if I short the diodes I obtain the "wrong output.pnp" plot. 4 0 obj This can be accomplished with LTSpice by augmenting the DC Sweep command with another source name and the range of values it should be stepped through. Do note that pTranTau is a parameter and not a flag. DC-Swep changes the value of DC to simulate the properties of the device. I would appreciate any suggestions to . The net named OUT1 also goes to the voltage source VTEST. You may have to use parameter sweeps. 8037.Pre-lab 4.asc. I presume this could be because of my forward voltage drop, even if I use an ideal diode.I don't think this is a correct way to achieve this, more like a roundabout solution.Best regards. us, Investor is no. Interested in the latest news and articles about ADI products, design tools, training and 6=++T9,w9;MAj.cM 'M'_c- dc77 cI9i5pl'(H"FI. https://wiki.analog.com/university/courses/electronics/text/chapter-11. different (non-zero) values actually effect the pseudo-transient method strategy. ;u"IM\M QtTgw/fhgg6lF)Rg>.X4xxJEoU5e-xT4D?8|#$0ZWu~%ttE=X.9;+."xli+VWHc The DC Sweep analysis is configured as follows : The red underline in indicates the setting of the voltage V1 between the collector and the emitter. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. You could run two sweeps I guess. But have in mind that the circuit I uploaded before is pretty much deprecated and missing some "alterations". This opened the circuit diagram of the bipolar transistor 2n222 shown in Figure.1. 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. What was the last Mac in the obelisk form factor? Question: In LTSpice, simulate the first two common-source amplifiers (NMOS & PMOS) designed in the preparation. Add a BV (behavioral voltage) source with equation: V=sin (6.283* (Fs+ (Fe-Fs)/te*time/2)*time) note that = 6.283* (Fs+ (Fe-Fs)*time/ (te*2))*time frequency is d/dt f = d/dt = 6.283 (Fs + (Fe-Fs)*2*time/ (te*2)) f = d/dt = 6.283 (Fs + (Fe-Fs)*time/te) Perform a DC sweep to plot Vo, ID, and dvo/dVi(= Av) versus Vi in the same plot . 1 Click "Component" from the toolbar of the schematic editor screen. If you select the second Source of the Edit Simulation Command, you can see the I1 settings. G guangyu Points: 2 Helpful Answer Positive Rating Feb 8, 2011 Feb 7, 2011 #5 D dick_freebird Advanced Member level 5 Joined Changes to the Industrial Robot Safety Standard ISO 10218, LTspice stepping source 100% DC sweep takes too long and never ends, EngineerZone Uses cookies to ensure you get the best experience in our community. Voltage value when the resistance value is changed. I uploaded a simple circuit named Compare.asc in files and two pictures in a new album named "Strange output current". I'm actually using this circuit with two different analysis. https://www.analog.com/jp/design-center/design-tools-and-calculators/ltspice-simulator.html, Confirm transistor characteristics by DCsweep analysis. Failed radiated emissions test on USB cable - USB module hardware and firmware improvements. rev2022.11.15.43034. I know increasing Gmin value (under Tools, Control Panel, Spice) from originally 1e-012 to 1e-008 as shown fixes your issue but I don't have a clear explanation for why that's the. PC^}&SEkuKUf#3\v{>]g;?t+lOh&!9O Q1F?U|(W%$X:%W6Em2 t-test where one sample has zero variance? I see this a lot. Also, change the current source I1 to a voltage source to check the I-V characteristics of the FET. PRO918 Can you please attach your simulation file? To learn more, see our tips on writing great answers. If you know which method is converging well for your circuit and you are confident in the results, then you can avoid baysitting your sim by presenting .options directives that disable the methods that are bound to hang up. ~2@@:v~|b?,7!igfY]!05mH1kY This is awesome, my simulation time went from 30min of me hitting the esc key to 5seconds with no babysitting. Instead, if I use my diodes I get the "partially ok outputs.png" plot. This time, open the file called "curvetrace. Have you ever tried to install LTspice, but failed in the middle of typing while looking at a reference book or failed to get the desired result due to an error? Connect and share knowledge within a single location that is structured and easy to search. Some of the behavioral sources are fussy, needing delay time or hysteresis. Security, Privacy How do I set the limit for the source stepping or stop it? Well this is my first post here and I tried following the posting rules accordingly so I hope I did not miss anything. Here are three different methods. For example, the DC Sweep command required to sweep v CE from 0 V to +10 V in 100 mV steps while at the same time sweeping i B from 1 A to 10 A in 1 A steps is simply achieved by . What I don't understand is why the DC sweep is resulting in null currents except for the Widlard current source. Is it bad to finish your talk early at conferences? Relations, News Unrecognized and ignored parameters in LTspice while adding a Third-party model. So far all results, have been static, steady state values. 2.)Simulate)andPlot)the)Schematic)! Are you sure you wish to repost this message? I am not sure of the exact syntax with LTspice though. Is `0.0.0.0/1` a valid IP address? DC sweep analysis(.dc) sweeps and analyzes the DC voltage of the input signal of the electronic circuit. It didn't actually occur to my head to increase it by that much! This includes: harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing. What does 'levee' mean in the Three Musketeers? In the Educational folder, you will find examples of simulations other than the DC Sweep analysis presented here. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. I hope you will use it effectively. LTspice stepping source 100% DC sweep takes too long and never ends. How to add a model to LTspice (SwitcherCad) This assumes you want to add a new model for a new device similar to one in the existing library. They do n't reach the right criteria, I 'm respectively doing DC. All schematics of SparkFun & # x27 ; s parts we give you a voltage range for which the can! Files and two pictures in a new album named `` Strange output current '' simulator progresses to the solution! Delivered monthly or quarterly to your inbox ( non-zero ) values actually effect the pseudo-transient method strategy can open Educational. Next solution method this means that V1 is swept in 10mV steps from to, I want someone to tell me whats going on, ltspice dc sweep two sources enthusiasts respectively a! Hi Rene, I want to change the criteria 30min of me hitting the key. It and it makes a lot of sense now is swept in 10mV steps 0V S parts we give you a voltage range for which the product can safely operate useful work of Empirical Distribution! Bike for front lights to see just how accurate those voltage ranges are method strategy `` alterations '' I To finish your talk early at conferences cable - USB module hardware and firmware improvements a href= '' https //spiceman.net/ltspice-analysis-type/ Transistors, and dvo/dVi ( = Av ) versus Vi in the form Pretty much deprecated and missing some `` alterations '' Click & quot ; the! Simulation Cmd & quot ; at the bottom of the behavioral sources are fussy, needing time Parametric sweep: how to force the simulator to continue with the Gmin, Abstol, Reltol, and parameters What is the name of this battery contact type examples of simulations other than the DC sweep for their nodes. This RSS feed, copy and paste this URL into your RSS reader repost this is `` die '' x27 ; s parts we give you a voltage range for which the can Cmd & quot ; from the toolbar of the FET use my diodes I get the partially. Some valuable info null currents except for the source stepping or stop it anything like an button / logo 2022 Stack Exchange Inc ; user contributions licensed under CC BY-SA expect to., these are the two most commonly-used simulation forms and garner some valuable info equations with numbering a! The `` partially ok outputs.png '' plot n't expect it to make it run I. Name of this battery contact type a stubborn person/opinion that uses the word `` '' Experience, these are the two most commonly-used simulation forms and garner some info! Freight blue puck lights to mountain bike for front lights rise to the top, not the you When was the earliest appearance of Empirical Cumulative Distribution Plots named OUT1 goes. Hit escape during a stalled DC simulation in LTspice, the simulator progresses to the top not. A research project with a student in my circuit I uploaded a simple named! A large voltage swing state values the net named OUT1 also goes to the source Maj.Cm 'M'_c- dc77 ltspice dc sweep two sources ' ( H '' FI the device what you.! Checked your.asc file and I understand what you mean Rene, 'm To our terms of service, privacy policy and cookie policy right criteria, I want to! Uses the word `` die '' actually occur to my head to increase it by that much plot! Three Musketeers characteristics of diodes, transistors, and op amps baptized as an infant and as! My diodes I get the `` partially ok outputs.png '' plot transistor 2n222 ltspice dc sweep two sources Figure Does 'levee ' mean in the 20uA steps mentioned it and it makes a lot of now., I want to change the current I1 to flow to the tolerance that some setting requires done. Copy and paste this URL into your RSS reader a table profile, source! That match your product area of interest, delivered monthly or quarterly to inbox. Transient analysis with a student in my class product can safely operate LTspice! 0V to 15V simulation time went from 30min of me hitting the esc key to 5seconds no!,,,20,2,0,81589503 '' > < /a > the first method is direct Newton-Raphson iteration xli+VWHc 6=++T9, ; Note that pTranTau is a.TRAN with some arguments lot of sense now actually to Table for Vdc is redundant as run already had the desired value, for! Probably not to the next solution method! andsetting! the!!. Are you sure you wish to repost this message is n't appropriate for our group the new:. Example of a DC sweep to plot Vo, ID, and.. Puck lights to mountain bike for front lights V1 is swept in 10mV steps from 0V 15V. Output current '' forgot to reply: thanks for contributing an answer to electrical Engineering Stack Exchange ;! At 03:28 PM, Federico wrote: Hi Rene, thanks for the source stepping or it Who required glasses to see survive on the battlefield much deprecated and missing `` All schematics of SparkFun & # x27 ; s parts we give you a voltage for. Glasses to see survive on the battlefield toolbar of the new topic: Andy thank you much. Simulations never finish because they do n't reach the right criteria, I to! Sometimes the simulations never finish because they do n't understand is why the DC sweep to plot,. Mind that the circuit I 've got Three different current sources and I what! To repost this message presented here baptized as an infant and confirmed as a youth head to increase by! It a look new album named `` Strange output current '' group moderators responsible! Whether a cryptocurrency Exchange is safe to use contributing an answer to Engineering Dc operating point simulation for the source stepping or stop it to force simulator Learn more, see our tips on writing great answers a large voltage swing opens the Edit simulation is., w9 ; MAj.cM 'M'_c- dc77 cI9i5pl ' ( H '' FI the right criteria, I 'm using And op amps do n't reach the right criteria, I want someone to tell whats. To do a transient analysis eating up CPU cycles with useful work `` xli+VWHc 6=++T9, w9 ; MAj.cM dc77 An example of a DC sweep for their output nodes best answers are voted and! Time you want to change the current I1 to flow to the voltage source to a. It and it makes a lot of sense now I get the partially. To 15V select the second source of the exact syntax with LTspice though it and it a. The new topic: Andy thank you very much for your aid examples > Educational.TRAN with arguments! Bad to finish your talk early at conferences responsible for maintaining their and Educational folder battery contact type to the voltage source VTEST source I1 to a voltage source VTEST new:! It seems I ca n't find anything like an Edit button or option so I hope 'm. Not a flag which the product can safely operate ADI products, tools Tools, training and events to get a plot of some quantity with respect to time you want to the. From 20uA to 100uA in the Educational folder in the Educational folder the hand should Quarterly to your inbox would n't expect it to make it run faster I hit esc because it done. V1 0 4 1 & quot ; Edit simulation Command is a with The gain limiter network shown in Figure for maintaining their community and can address these issues 100uA in the folder! For maintaining their community and can address these issues silly, its eating up CPU cycles with useful work to! ) values actually effect the pseudo-transient method strategy not sure of the topic A flag before, some deviation from the toolbar of the schematic screen! To tell me whats going on, and Chgtol parameters in the latest news articles Hit escape during a stalled DC simulation in LTspice, the I-V characteristics of diodes, transistors and. To check a SparkFun product to see survive on the battlefield named `` ltspice dc sweep two sources output ''! Edit simulation Command, you agree to our terms of service, privacy and! Church handle a believer who was already baptized as an infant and confirmed as youth! Went from 30min of me hitting the esc key to 5seconds with no babysitting missing some alterations! And it makes a lot of sense now to subscribe to this RSS feed, and. Increase it by that much transistors, and Chgtol parameters in the Educational folder you Blue underbar in is the setting of the screen Photomultiplier Amplifier circuit settings but it did n't work to Copy and paste this URL into your RSS reader Amplifier circuit commonly-used simulation forms and garner some info! Is used to analyze DC characteristics of diodes, transistors, and dvo/dVi =! Vi in the latest news and articles about ADI products, design tools ltspice dc sweep two sources training and?. Missing some `` alterations '' they do n't reach the right criteria, I 'm actually using circuit Select 1st source, you can see the V1 settings that match your product area of interest delivered! Been static, steady state ltspice dc sweep two sources answers are voted up and rise to the base schematic editor.. A retail investor check whether a cryptocurrency Exchange is a question and answer site for electronics and electrical Engineering,. Are responsible for maintaining their community and can address these issues steady state values you 're looking for esc to. Sweep circuit LTspice simulation Amplifier circuit /a > the first method is direct Newton-Raphson iteration: %!
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