LTspice tutorial - Measuring Impedance (part 1/2)

#170 In this video I look at various ways in which impedance can be measured in the circuit simulator, and how based on this measurement, an equivalent circuit can be determined. This time I mainly look at some basic RLC circuits - 1 port devices - just to be able to observe the clear correspondence between measurement and test circuit.
Correction: at 14:14 the theta angle is equal to the arctan of X/R
LTspice impedance part1 - • LTspice tutorial - Mea...
LTspice impedance part2 - • LTspice tutorial - Net...
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[@maksymkloka7819]

My favorite channel on KZbin.

[@getusel]

I would like to propose few corrections here. Current through a capacitor has +90 phase shift from the voltage across the capacitor. The capacitor current is ahead of the voltage. That means the phase shift is +90 degree. In the video, it is described otherwise. Secondly, it is stated that the inductor current is ahead of the voltage. A peak that occurs later in time is not considered ahead. The inductor current is behind the voltage. It is not ahead of the voltage. Therefore, current through an inductor has -90 degree phase shift from the voltage across it. If we think in terms of delay, the inductor current is behind the voltage.

[@paps.bricole]

This is so clear ! Thx

[@pigglewiggle175]

I didn't ever think to try this within LTspice. Very interesting

[@rjordans]

For measuring the phase shift on the oscilloscope I usually look at the zero crossing, much easier to get an accurate rating that way. Anyway, nice and clear explanation again!

[@HitAndMissLab]

This series is golden.

[@pierrejonsichon1482]

this video is extremely informative !! Impressive! Very clear and detailed explanations

[@MrHashmi90]

Perfect explanation

[@programorprogrammed]

Fantastic video

[@lmwlmw4468]

Great video.

[@adrienferreira4666]

You bought yourself a nice frequency generator :)

[@xDR1TeK]

Theta is arctangent of x/r

[@FesZElectronics]

Yes it is...

[@xDR1TeK]

@@FesZElectronics honestly I felt ashamed to point it out. You do an exceptional work making these videos. Quite brilliant actually.

[@FesZElectronics]

Don't worry! I do make mistakes from time to time, and its important to point it out.. that is how we learn :D

[@xDR1TeK]

@@FesZElectronics but I thought you were Jesus 🤣 kidding 😂😂😂

[@gogich]

@@FesZElectronics I paused the video and started to calculate stuff right away. After an hour of the results not making any sense I checked the wikipedia and headed straight to the comments. If you add some kind of indications/corrections to the video(s) where you find inaccuracies after the upload it might just save some impatient soul like me an hour or two :) P.S. Love your work, man! And I might just remember the formulas better because of this incident

[@manoA98A]

A thing that I noticed about "impedeances" and voltage generator in Ltspice The voltage generator generates a current based on the impedeance that he sees consirering ohm's law I=V/R Example: if you put 5V and 1 ohm, you will have 5A. But if you want to simulate and arduino power supply, it would be 5V and 250mA as maximum current and the only way that I found is to put an ideal diode with Vfw=0V and illimit=200mA. In this way I can simulate a laboratory power supply with desired voltage and current, is that correct in your opinion?

[@pavanp611]

Could you also help in simulating for Op-amp output impedance

[@thathalfthaiguy]

Don’t forget that in real life outside of computer simulations, passive components are not purely resistive, inductive or capacitive… but a combination of these things. A resistor may be a better inductor than a resistor at certain frequencies and the capacitance of a coil may not be negligible. Especially in high voltage high frequency circuits, you can get strange unexpected behaviors. And if you work with open circuits… things get really weird.

[@RoGeorgeRoGeorge]

Impedance is the ratio between a cause and its effect.

[@arunsebastian4035]

can you help me ?, how can we do transimpedance analysis of a single photon detector in LTSpicea ?

[@whippoorwill1124]

"... and the inductor current - this green one - is ahead of the voltage ..." No it's not; it's *behind* the voltage. Current through an inductor lags the applied voltage: the peaks (for example) of current occur 90 degrees *later* than - i.e. to the right of - the voltage peaks. You apply a voltage which tries to force current through the inductor; the inductor resists the increase in current, so the current can only build up slowly - it lags the voltage.

[@getusel]

You are right. I wrote similar comment before I read yours.

[@ihabsglei]

14:37 The formula for theat is wrong.

[@dr-mnizam]

This video shows how to install LTSpice: kzbin.info/www/bejne/nWbXZXZoisl-gKs

[@architakumar2579]

For rf analysis which mode of simulation is used in Ltspice?

[@FesZElectronics]

The type of analysis will mostly be decided by what exactly you are trying to simulate.

[@notaras1985]

Is Ltspice a paid program?

[@FesZElectronics]

No. At least at the moment of writing, LTspice is free, it can be downloaded from the Analog.com website