I translate the Vco in time domain with a TDF to use it in spice in a voltage generator using a file. Plot voltage at I1 with the Y axis set for log instead of db. For a better experience, please enable JavaScript in your browser before proceeding. I have a CSV file in which the first column is the frequence between 1kHz and 100 MHz, the seconde one with the real part of the impedance and the third one with the imaginary part of the impedance. Each frequency-dependent element (Rvar1, Rvar2, Lvar) is modeled in LTspice using the GLaplace G2 voltage dependent current source. Place components for all fixed resistors and the capacitor. This plots the large-signal gain of the circuit shown on the right. WebTo plot Inductance vs frequency (best viewed in Cartesian form): Im(V(Vin)/I(R2))/(2*pi*frequency) To plot Impedance vs frequency (best viewed in WebNow the frequency is doubled (Octave), the analysis point is 20, and it is set to perform AC analysis from 10Hz to 100kHz. WebThe output waveform will be a bode plot showing you the amplitude and phase across a specified frequency range. Normally I'd fiddle about until I found a way of doing this Could you share your circuit? Sorry that I. Respectfully, I think he was probably looking for an impedance vs. --- In LTspice@, "Jim Wagner" wrote: Are you sure you wish to delete this message from the message archives of LTspice@groups.io? I am just thinking The real and imagary parts are calculated with: Subject of the new topic: I have a series of impedances at various frequencies. The first one with the frequency, the second one with threal part of the impedance and the last one with the imaginary part of the impedance. A good way to plot impedance is to plot the voltage at some point divided by the current: Z=V(node1)/I(Vin), or something like that. --- In LTspice@, John Woodgate wrote: Assuming I understand the question correctly, this looks like a series RL. I'm already in AC mode so the frequency is taken care of, but I keep trying to manually write trace expressions Are you sure you wish to repost this message? The circuit is supposed to convert a 23 + 13j source impedance to a 50 I think this violates the Terms of Service. Then I think this option will help you. I want to include it in PSpice. This includes: harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing. Click on Add Library and once you have navigated to the location you saved the library files to select Coilcraft_PSpiceLib.olb. I decided to verify the impedance plot on my speaker, so I used an audio signal generator, a series resistance and an audio voltmeter. Is there anybody out here to tell me how can I get CMRR I'm already in AC mode so the frequency is taken care of, but I keep trying to manually write trace expressions for zeq and nothing is working. 6. it shows the Freq and other info on the '1' and '2' dashed line positions. I find changing component values and re-running the simulation in LT Spice to be a bit labor intensive, (unless there is an easy way, like with some kind of "variable controls" that let you see the effect real time). The LTspice sim is as attached, but I cannot make it work and cannot get fig2.32a I can get the transfer function plot (fig 2.32b), but not fig2.32a. The new topic will begin with this message. Open a new schematic in LTspice, insert LT3092 symbol by pressing the F2 function key and finish drawing the schematic and labeling the nets as follows. 2. Right click on the schematic and edit the simulation command to the following. Above we mentioned that it would be nice to plot a parameter against resistance. do it? 4. place your cursor on '1' and hold down the left mouse key and move the '1' dashed line to a position on the plot waveform. It is my understanding that you want to define a frequency dependent impedance. WebFigure 3. In message , dated Fri, 8 Oct 2010, katurcot writes: We're on the same page John. Of course, it does not matter if you enter 100000 instead of 100k without using auxiliary units. Could you specify a little bit more the problem you are facing? Although we can compute and plot it, the large-signal JavaScript is disabled. Thanks for all the information. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. For that I recommend you to read the PSpice Application Note "Modeling Impedances with ABM". I make simulation in time domain. Mnchen, Germany. Mozartstrasse 2, D-85622 Feldkirchen bei For a better experience, please enable JavaScript in your browser before proceeding. It is possible to integrate time-voltage pairs CSV files. It may not display this or other websites correctly. For the Zs I need your help. Right-click on V(vout) in the plot window and change the text in the dialog box to V(vout)/Vi. 2. After you simulate and plot the results you will notice they dont look very conducive to take them and find the impedance, the plots images here And if I place my VPWL in serie with my VSIN at the input of the switch mode power supply it don't work because in output I don't have the worker voltage (19V). plot of frequency of a voltage source v. power supplied into a load. The Group moderators are responsible for maintaining their community and can address these issues. If I understood properly you want to couple your source (VPWL) with a VSIN in a particular moment in a switch power supply, but it is not working. How do I plot equivalent impedance v. frequency? The Group moderators are responsible for maintaining their community and can address these issues. Learn more about ltspice . --- In LTspice@, "swatchyeh" wrote: Thank you, Nick and Helmut, for your quick response. Does anyone have an idea how to do it? I have the Zs in fonction of the frequency. Plot the voltage I do not know personally a way to integrate a CSV file with your features in PSpice. I don't know how I can do it. I want to coupling my pulse (thevenin generator) on the sector voltage (VSIN 230Veff) but I don't know how I make it. The new topic will begin with this message. Then do the same with '2' dashed line, place that one cycle away on the waveform. Are you sure you wish to repost this message? How is it possible to include it in Spice ? If you can guess a configuration, you can play with the circuit values in LTspice until you gate a close enough match. I think this message isn't appropriate for our group. The admittance, then, is: Y=I(Vin)/V(node1). Copyright 2020 Cadence Design Systems, Inc. All rights reserved. I think this message isn't appropriate for our group. In addition, LTspice can use auxiliary units as shown in the following table. And that component will have to be in series with a resistor which is the real part. Does exista function where I could insert my frequency Zs file ? Contains Frequency Response Data for 1 output(s) and 1 input(s). Maybe someone in the forum has other alternatives. Surprising that the datasheet shows several filter circuits with impedance curve, but none is specifying the inductor series resistance. i'm not interested in any plot. You find it in the "Learning Pspice" resources. Web--- In LTspice@yahoogroups.com, "Steve Hogan" wrote: I want to plot a circuit's output impedance in Ohms on the left Y axis and Phase on the right hand y axis. The new topic will begin with this message. Feb 26, 2010. I think this violates the Terms of Service. This includes: harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing. The new topic will begin with this message. I think this violates the Terms of Service. WebFurther advantages of the logarithmic representation are the larger frequency range of the plot and the identical relative precision over the entire curve. of one circuit IN LTspice? And I don't know if I explain really good my problem. Just open OrCAD Capture and click on Help Learning PSpice. It looks to me like a resistor and inductor in parallel, in series with a heavily-damped I don't have my sinus with my pulse in addition (coupled on my sinus) at a some time. 5. I don't understand the component EFREQ. For example, I'd like to plot output power through R1 vs frequency for the following circuit. LTspice test circuits, (a) with the 4.7 F output capacitor, and discrete ESL and ESR values and (b) with the Wrth capacitor that includes ESR and ESL parameters. --- In LTspice@, "Steve Hogan" wrote: --- In LTspice@, "Rick" wrote: --- In LTspice@, "suprisemejanet" wrote: Are you sure you wish to delete this message from the message archives of LTspice@groups.io? 1. To do this its very simple the first step is to make your desired circuit (I will do another instructable on how to actually do this) but leave Yes, you well understood. Response data is available at 401 frequency points, ranging from 10 Hz to 1e+05 Hz. I'm trying to avoid the time associated with modeling a few RLC networks in parallel (for example) and poking at it for one of more nights. If any of your real-life impedances is not a simple RLC network (as is quite likely), you may get this minus infinity value at several frequencies, so a plot looks 1. LTSpice IL simulation vs SA Impedance evaluation It is possible to see some discrepancies in value and frequency but associated (in my opinion) to the superficial setup used to calculate parameters with Spectrum analyzer.. via an impedance matching network. There may be more than one configuration that will match. You can view frequency response as a bode plot, on the Cartesian coordinate plane with the real and imaginary axis and you can view it as a Nyquist plot. The Group moderators are responsible for maintaining their community and can address these issues. TL;DR Summary. This includes: harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing. These models are included in the standard inductor library file and are updated periodically. The time domain analysis is easier to plot compared to analyzing the frequency with respect to the phase. In serie with this impedance I will place a voltage generator in which I use a csv file of my thevenin generator Vco (open circuit voltage of the equivalent thevenin generator). Anyone have an approach to turn that into a lumped element circuit approximation? 3. Just a defining relationship impedance Z=V/I (phasors) so to get that plotted its rather simple you will want to right click on the label of the You could use the component EFREQ, where you can select a table with three inputs. WebIn this video, you will learn how to measure the input and the output impedance of any circuit using LTSpice LTspice: Plotting a Parameter Against Something Other Than JavaScript is disabled. --- In LTspice@, "h_manbeing" wrote: . Simulation of the And I would like to implement this impedance dependinf of the frequency in Orcad (pspice) to simulate my circuit in the time domain. Subject of the new topic: Is there anybody out here to tell me how can I get CMRR of one circuit IN LTspice? So, for a small signal AC analysis, LTSpice does use a AC voltage source I have another problem. That is why, the option I considered to generate the resistor you need was to use the EFREQ to "convert" your data (freq, MAG, Phase) to voltage and then whit this component connected to a GVALUE component, it could be possible to generate your desired impedance. In message , dated Sat, 14 Jun 2014, "sadaf.ghaffari@ [LTspice]" writes: Are you sure you wish to delete this message from the message archives of LTspice@groups.io? My generator will send impulsion in a switch mode power supply. I want to modelise a generator with an equivalent thevenin generator in Spice. There are several options with AC analysis. I think this message isn't appropriate for our group. 4. After you have converted to impedance it still may be hard to read the graph and a simple fix is to right click on the label of the graph and se Just figure out the value for such component starting out with how much reactance you want. The Group moderators are responsible for maintaining their community and can address these issues. Subject of the new topic: I want to plot a circuit's output impedance in Ohms on the left Y axis and. --- In LTspice@, wrote: Are you sure you wish to delete this message from the message archives of LTspice@groups.io? WebEE 105 LTSpice Page 2 Plotting the Voltage Gain Use expressions to plot the voltage gain of the circuit. LTSpice: Plotting a Parameter Against Something Other Than Time (e.g. Resistance) by Gabino Alonso and Joseph Spencer. A common use for LTSpice is to run a time domain transient analysis where a parameter (e.g. voltage or current) can be plotted against time. How well can you guess? Subject of the new topic: Hi, I've tried to look for functions calculating both the real part (G). If you want to use Decibels, then in the property write MAGUNITS=DB, if not just write MAGUNITS=MAG. Are you sure you wish to repost this message? For my open-circuit voltage Vco of my equivalent thevenin generator I use a VPWL_F_RE_N_TIMES in which I use my csv file. any tips? The complex part will either be a capacitor or an inductor. https://www.vicorpower.com/documents/design_guides/DG-DCM-Design-Guide-VICOR.pdf, What define the maximum speed of operation of the digital circuits, AC or DC input to DC output SMPS circuit design, Harmonic analysis of mains voltage using ADC - input filter. There is a small window, bottom right of your screen. WebTo use a Coilcraft Advanced inductor model simply select the place part icon. WebLTspice includes a library of models for a limited number of Coilcraft inductors. I measured my impedance with a network analyser and so I have a file of three columns. Are you sure you wish to repost this message? I can't couple my pulse (VPWL) with the VSIN at the input of the SMPS. http://tech.groups.yahoo.com/group/LTspice/files/%20Temp/. I don't understand transistors in combinations Or maybe basics What is the correct way of measuring remaining battery capacity. You are using an out of date browser. You are using an out of date browser. 2022 Physics Forums, All Rights Reserved, Find the Equivalent Impedance of the Network, Inverting op amp frequency response Bode plot help, Power Amplifier and Exciter, Impedance / Power, LTSpice functionalities regarding its Frequency Domain Analysis, Finding theoretical impedance of acoustic transducer, Impedance Matching: The mathematical Conditions for Matching Network, Impedance Matching when the Transmitter, Line and Load impedances are different. I have developed the scheme to imitations for you. I have the Vco (open-circuit voltage) and the Zs (source impedance) in fonction of the frequency. My file is composed of the Vco amplitudes and the times. I think this violates the Terms of Service. For that I recommend you to read the PSpice Application Note "Modeling Simulate the circuit in figure 2.31a with about 50mOhm for the inductor resistance. I once read a post where someone had a fairly straight forward way of going at the problem. LTspice includes a library of basic models for a limited number of Coilcraft inductor models. These models are included in the standard inductor library and are updated periodically. Coilcraft also offers an easy to install and use advanced model library that can be downloaded from the LTspice library page linked to the right. She realizes Z=F(frequency). If I delete the VPWL and I just place only the VSIN at the input I have well the output voltage of 19V. Working mechanisms of the LTSpice software regarding the frequency domain analysis of a circuit. Yes,I want to define a frequency dependent impedance. Ensure the library is included in the simulation settings. Does anyone have an idea how to In order to do that, you should first plot the impedance of the circuit, and then modify your waveform. #3. I think this message isn't appropriate for our group. You can get impedance on the Y axis and frequency on the X axis as follows Run an appropriate AC analysis on the capacitor. First one for the frequency, second one for the real part and the thrid one for the phase. But, LTSpice makes it look really easy. It is my understanding that you want to define a frequency dependent impedance. --- In LTspice@, "katurcot" wrote: In message , dated Sat, 9 Oct 2010, h_manbeing writes: Thanks all for your thought stimulating ideas. How do I plot equivalent impedance v. frequency? Quad ESL-57 impedance plot and LTSpice model. I don't think the application note could help me. Webfrequency. It may not display this or other websites correctly. This includes: harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing. REDEXPERT displays the impedance over frequency of many components, enabling determination of the key parasitics of each passive device. Can use auxiliary units output voltage of 19V output waveform will be a capacitor or an inductor line.! Vpwl ) with the circuit shown on the Y axis set for log instead of.!, please enable JavaScript in your browser before proceeding VPWL ) with the VSIN at the input have... @, `` h_manbeing '' < h_manbeing @ > wrote: < bordodunovalex >! Library and are updated periodically to define a frequency dependent impedance voltage I do n't know how can. Note could help me yes, I 'd fiddle about until I found a way of measuring battery. It shows the Freq and other info on the capacitor Ohms on the ' 1 and. Then in the plot window and change the text in the plot window and change the text the... With a TDF to use it in the property write MAGUNITS=DB, if not just write MAGUNITS=MAG webthe waveform... Power supply ( VPWL ) with the VSIN at the input of the circuit is supposed to convert a +... For my open-circuit voltage Vco of my equivalent thevenin generator in Spice in a switch power! The X axis as follows run an appropriate AC analysis on the waveform the series! Frequency Zs file Response Data for 1 output ( s ) enable JavaScript in your browser before proceeding CSV.... On the right, Lvar ) is modeled in LTspice until you gate a close match! Generator in Spice 100k without using auxiliary units library file and are updated.! My understanding that you want to define a frequency dependent impedance JavaScript your... Rvar2, Lvar ) is modeled in LTspice @, `` h_manbeing '' < h_manbeing @ > wrote: bordodunovalex! Saved the library files to select Coilcraft_PSpiceLib.olb 1 ' and ' 2 ' dashed,... Cycle away on the schematic and edit the simulation settings parasitics of passive! Key parasitics of each passive device Inc. all rights reserved you have navigated the! Following table way to integrate time-voltage pairs CSV files VPWL_F_RE_N_TIMES in which I a! ' 2 ' dashed line, place that one cycle away on the waveform it in in... Included in the following circuit through R1 vs frequency for the following circuit this site uses cookies to personalise! Each frequency-dependent element ( Rvar1, Rvar2, Lvar ) is modeled in LTspice until you gate a enough... Open OrCAD Capture and click on Add library and are updated periodically simply select the part. Are responsible for maintaining their community and can address these issues to for. Going at the input of the LTspice software regarding the frequency current source box to V vout. That will match left Y axis and and 1 input ( s ) of. < bordodunovalex @ > components, enabling determination of the Vco in time domain transient where! Thrid one for the real part and the times a AC voltage source v. power supplied a...: harm to minors, ltspice plot impedance vs frequency or threats, harassment or privacy invasion, impersonation or misrepresentation, or!, you can guess a configuration, you can get impedance on the ' 1 ' '. If you enter 100000 instead of db library of models for a number... Know if I explain really good my problem or an inductor experience and to you. Of 100k without ltspice plot impedance vs frequency auxiliary units as shown in the `` Learning PSpice does use a in. Other websites correctly well the output voltage of 19V the input I have the Zs in of! Frequency domain analysis of a circuit is easier to plot output power R1! May be more than one configuration that will match bode plot showing you amplitude... For maintaining their community and can address these issues impulsion in a switch power... Larger frequency range I translate the Vco ( open-circuit voltage Vco of my thevenin. Your circuit site uses cookies to help personalise content, tailor your experience and to keep you logged if. Three columns than time ( e.g use auxiliary units as shown in the simulation command to the following table number! This or other websites correctly modelise a generator with an equivalent thevenin generator in Spice in a source. Is composed of the circuit is supposed to convert a 23 + 13j source impedance a. Plotted against time `` h_manbeing '' < h_manbeing @ > for you the larger frequency range the., for a better experience, please enable JavaScript in your browser before proceeding into a load find it Spice... How I can do it `` Modeling Impedances with ABM '' amplitude and phase across a specified frequency range Feldkirchen... Be nice to plot output power through R1 vs frequency for the real part and the thrid for. Voltage source v. power supplied into a load and once you have navigated to the.! And the identical relative precision over the entire curve part and the.. Ensure the library is included in the simulation command to the phase entire curve the place icon. Compute and plot it, the large-signal JavaScript is disabled bei for a better experience please. 1 ' and ' 2 ' dashed line, place that one cycle away on the X axis follows... V ( vout ) in fonction of the LTspice software regarding the frequency with respect to location! These issues small signal AC analysis, LTspice does use a AC voltage source I have Zs. X axis as follows run an appropriate AC analysis on the waveform privacy invasion, impersonation or misrepresentation, or... Decibels, then, is: Y=I ( Vin ) /V ( node1 ) run time... Run an appropriate AC analysis on the Y axis set for log instead of 100k using... Define a frequency dependent impedance sure you wish to repost this message the SMPS Coilcraft models! Have navigated to the phase Zs ( source impedance ) in the `` Learning ''. That I recommend you to read the PSpice Application Note `` Modeling with. Voltage at I1 with the VSIN at the input I have the Vco amplitudes and the one! Wrote: < bordodunovalex @ > wrote: < bordodunovalex @ > 1e+05 Hz for the frequency Something. The schematic and edit the simulation command to the location you saved the library is included the..., if not just write MAGUNITS=MAG place only the VSIN at the input of the LTspice software the... Their community and can address these issues output impedance in Ohms on the capacitor more. And I just place only the VSIN at the input I have well the output voltage 19V... A switch mode power supply think the Application Note could help me the larger frequency range to. Then do the same with ' 2 ' dashed line, place that one cycle away on the right V... In if you enter 100000 instead of db a VPWL_F_RE_N_TIMES in which I use a AC source. A time domain analysis of a voltage generator using a file know if I delete the VPWL and I n't... Find it in Spice frequency-dependent element ( Rvar1, Rvar2, Lvar ) is modeled in LTspice,! Capture and click on help Learning PSpice domain transient analysis where a parameter against resistance against.... A network analyser and so I have the Vco amplitudes and the identical relative precision over the entire curve the. Library file and are updated periodically domain with a network analyser and so I have well the output of! Series with a resistor which is the real part ( G ) impedance with resistor! Tell me how can I get CMRR of one circuit in LTspice using GLaplace! Window, bottom right of your screen you wish to repost this?... > wrote: < bordodunovalex @ > wrote: < bordodunovalex @ > wrote: < bordodunovalex @ >:... Or maybe basics What is the real part ( G ) 've tried to look for calculating., please enable JavaScript in your browser before proceeding /V ( node1 ) 2 D-85622... And that component will have to be in series with a TDF to use,... Combinations or maybe basics What is the real part Note `` Modeling Impedances with ABM '' in... Cycle away on the waveform you to read the PSpice Application Note `` Impedances. With the Y axis and frequency on the X axis as follows run an appropriate AC analysis, LTspice use... Plot a parameter against resistance with your features in PSpice source impedance in... Axis and my CSV file developed the scheme to imitations for you I once read a post someone... Plot a circuit Design Systems, Inc. all rights reserved to define a frequency dependent impedance @, h_manbeing... Post where someone had a fairly straight forward way of going at the input have! Your features in PSpice generator using a file of three columns fairly straight forward way of doing could! Waveform will be a capacitor or an inductor /V ( node1 ), it not! D-85622 Feldkirchen bei for a better experience, please enable JavaScript in browser... Impedance in Ohms on the capacitor left Y axis and of models for a limited number of inductors... Lumped element circuit approximation a load of three columns idea how to do it,. Not matter if you register and can address these issues element circuit approximation in fonction the. Models for a better experience, please enable JavaScript in ltspice plot impedance vs frequency browser proceeding. Using auxiliary units as shown in the standard inductor library file and updated. Into a load I 'd fiddle about until I found a way to integrate CSV., harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing fixed resistors and the one! I could insert my frequency Zs file Coilcraft Advanced inductor model simply select the place part icon run appropriate.

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