Your videos are very great, I already shared your channel with all my colleagues. keep creating quality content. Thank you. Saludos desde Argentina..!!
I was really surprised just how well it turned out in real life; I was afraid that the simulation would be just too ideal in comparison with the practical circuit.
Good to see you demonstrating Math menu functions of oscilloscope. I remember the old HP3577A Network analyzer have DEFINE MATH functions for multi-receivers in frequency domain although it's not spectrum analyzer.
your videos are simply amazing.... I have learnt so much from you .....can you make a video on how common mode noise is generated in typical high frequency electronic circuits?
Differential-mode and common-mode signals are important to understand in the design of complex signal-conditioning circuits which use operational amplifiers in medical diagnostic, industrial control and military applications. Operational amplifiers mainly excel in performance to provide a high common-mode rejection ratio and high gain. By using negative feedback, its overall gain, input impedance and bandwidth are determined by external components without these parameters being affected by the op-amp’s parameter variations due to external influences like temperature and so on. Most amplifiers built using discrete transistors will not be able to match the performance characteristics of an operational amplifier like CMRR, low drift, high input impedance and stability of gain. Engineers are so used to thinking and visualising currents as differential-mode in circuit analysis that they find it hard to switch their thinking to common-mode currents and their effects in say, amplifying circuits. It will be instructive to understand and visualise Current at its most fundamental level in the presence of electric fields in ordinary conductors. Electrostatics and circuits belong to one science not two. To learn the operation of circuits, Current and the conduction process, resistors and how discussing these topics makes it easier to understand the operation of capacitors, inductors, diodes and their operation in amplifier circuits and circuit theory watch these two videos i. ua-cam.com/video/TTtt28b1dYo/v-deo.html and ii. ua-cam.com/video/8BQM_xw2Rfo/v-deo.html Most common-mode signals originate because of sources external to the system, and the energy in them circulates annoyingly until it is dissipated in resistive portions. They can be generated internally if proper cables are not used for coupling signals at the frequencies of the signals they carry. Therefore the need arises for amplifiers to amplify only the useful differential signal and reject the common-mode component which does not belong to the signal conditioning system. Such an amplifier is used as the first stage of an operational amplifier which opens the door to allow a signal from a sensor ‘in’, so to say and so the importance given to this stage. Topics related to these aspects are discussed in chapters 3 and 5 of textbook 4 (see last frame References in video #1) and a power point presentation with animations “Basic Action of a Differential Amplifer-Heart of the Opamp” which explains differential amplifier with a U-tube manometer analogy of differential- and common- mode signals is included in the CD alongwith this book.
Hello, Nice vidoe. I have simulated a filter for a noisy DC power supply where I considered using a common mode choke first for common mode noises, followed by a ferrite bead with some capacitors, and finally a Pi filter with a 127kHz cutoff. I connected a generator to simulate how effective my design circuit is. I used the generator you created in the video and connected it to the EMI/EMC filter I designed, placing it on the power supply's positive (+) and negative (-) lines. On the output, I plotted the dBuV against the magnitude, essentially performing an AC analysis. My filter response is very good, with attenuation exactly at 127kHz, where it drops off significantly. My question is: for simulating the filter with a high noise input power supply, is the generator you designed sufficient? If it is, what would be the best way to analyze the filter's output? Specifically, how do I interpret the dB to magnitude graph to confirm that my filter is working effectively?
in an unbalanced system, is it enough to connect oscilloscope channel A to circuit signal, channel B to circuit ground, with scope grounds floating, creating a floating differential pair to perform MATH functions on to learn CM and DM properties? I am looking for a budget friendly way to measure improvements in CM noise when applying filters, with the major tools available being oscilloscope and function generator.
In the case of the CM noise, I was measuring the noise in reference 2 ground both times, so the values added up; with the DM, if its properly floating then the values in reference to GND would be half of the initial signal; both lines are oscillating in reference to GND, when one is increasing the other is decreasing and the total peak to peak never exceeds the initial input value - rather than having 5-(-5) the total would be 2.5-(-2.5)
first of all, thank you for your video it's very helpful, I just have a question about the source of the common-mode voltage as we know we apply just the differential voltage between the two wires but the common one exist too
good morning your videos are wonderful, do you happen to have one that measures the thd of an amplifier between the input and output Vsin signal) the classic settings I'm using don't work or in any case I find anomalies. grazie
differential noise and differential signals are different. Correct? It seems like common mode and differential mode usage depends on what we are talking about, noise, signal, rejection ratio etc. which makes it confusing
Hell FesZ, So, in the real world if you have a class I device or a class II device you would make these measurements with respect to chassis i.e. you would use two probes with each of their grounds connected to chassis? The two signals (sig1 and sig2) are representing the signal and return path correct?
You can do that only if first you use a passive or active circuit that processes the 2 signals. There are some commercial products that can achieve this.
I don't know why your subscriber number is still stuck at 18K. You deserve way more subscriber. Excellent video. Thank you!
It's 60.5k now!! Consider that electronics is not a topic that a lot of people on UA-cam will look for.
Your videos are very great, I already shared your channel with all my colleagues. keep creating quality content. Thank you. Saludos desde Argentina..!!
Much appreciated! Thank you!
Thank you Sir!... Running the experiment in real physical oscilloscope made things even more interesting 🕺🕺🕺
I was really surprised just how well it turned out in real life; I was afraid that the simulation would be just too ideal in comparison with the practical circuit.
Good to see you demonstrating Math menu functions of oscilloscope. I remember the old HP3577A Network analyzer have DEFINE MATH functions for multi-receivers in frequency domain although it's not spectrum analyzer.
Great as usual!
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Thank you FesZ Electronics!
This channel is a gem, great video! Thanks a lot!
Mr. Thank you for that great explanations
your videos are simply amazing.... I have learnt so much from you .....can you make a video on how common mode noise is generated in typical high frequency electronic circuits?
Great video, thank you so much!
Glad you enjoyed it! Thank you!
I love to learn from you. Very informative.
Very informative video!
Glad it was helpful!
Amazing, thank you for this video. simple and precise. Interested watch your video measuring it on a spectrum analyzer
More than a year later, I actually got to do that :D ua-cam.com/video/fhPTnoNQG_A/v-deo.html
Thank you for posting this video it would have been nice to show how to filter out these noises
thanks so much
Differential-mode and common-mode signals are important to understand in the design of complex signal-conditioning circuits which use operational amplifiers in medical diagnostic, industrial control and military applications.
Operational amplifiers mainly excel in performance to provide a high common-mode rejection ratio and high gain. By using negative feedback, its overall gain, input impedance and bandwidth are determined by external components without these parameters being affected by the op-amp’s parameter variations due to external influences like temperature and so on.
Most amplifiers built using discrete transistors will not be able to match the performance characteristics of an operational amplifier like CMRR, low drift, high input impedance and stability of gain.
Engineers are so used to thinking and visualising currents as differential-mode in circuit analysis that they find it hard to switch their thinking to common-mode currents and their effects in say, amplifying circuits.
It will be instructive to understand and visualise Current at its most fundamental level in the presence of electric fields in ordinary conductors.
Electrostatics and circuits belong to one science not two. To learn the operation of circuits, Current and the conduction process, resistors and how discussing these topics makes it easier to understand the operation of capacitors, inductors, diodes and their operation in amplifier circuits and circuit theory watch these two videos
i. ua-cam.com/video/TTtt28b1dYo/v-deo.html and
ii. ua-cam.com/video/8BQM_xw2Rfo/v-deo.html
Most common-mode signals originate because of sources external to the system, and the energy in them circulates annoyingly until it is dissipated in resistive portions. They can be generated internally if proper cables are not used for coupling signals at the frequencies of the signals they carry.
Therefore the need arises for amplifiers to amplify only the useful differential signal and reject the common-mode component which does not belong to the signal conditioning system. Such an amplifier is used as the first stage of an operational amplifier which opens the door to allow a signal from a sensor ‘in’, so to say and so the importance given to this stage.
Topics related to these aspects are discussed in chapters 3 and 5 of textbook 4 (see last frame References in video #1) and a power point presentation with animations “Basic Action of a Differential Amplifer-Heart of the Opamp” which explains differential amplifier with a U-tube manometer analogy of differential- and common- mode signals is included in the CD alongwith this book.
This is good stuff.
Thank you! I'm happy you are enjoying it!
Hello, Nice vidoe. I have simulated a filter for a noisy DC power supply where I considered using a common mode choke first for common mode noises, followed by a ferrite bead with some capacitors, and finally a Pi filter with a 127kHz cutoff. I connected a generator to simulate how effective my design circuit is. I used the generator you created in the video and connected it to the EMI/EMC filter I designed, placing it on the power supply's positive (+) and negative (-) lines. On the output, I plotted the dBuV against the magnitude, essentially performing an AC analysis. My filter response is very good, with attenuation exactly at 127kHz, where it drops off significantly. My question is: for simulating the filter with a high noise input power supply, is the generator you designed sufficient? If it is, what would be the best way to analyze the filter's output? Specifically, how do I interpret the dB to magnitude graph to confirm that my filter is working effectively?
in an unbalanced system, is it enough to connect oscilloscope channel A to circuit signal, channel B to circuit ground, with scope grounds floating, creating a floating differential pair to perform MATH functions on to learn CM and DM properties?
I am looking for a budget friendly way to measure improvements in CM noise when applying filters, with the major tools available being oscilloscope and function generator.
❤❤❤
Why doesn't the DM noise also double when it is isolated? By subtracting the two lines, I'd expect something like 5-(-5)=10, or -5-5=-10.
In the case of the CM noise, I was measuring the noise in reference 2 ground both times, so the values added up; with the DM, if its properly floating then the values in reference to GND would be half of the initial signal; both lines are oscillating in reference to GND, when one is increasing the other is decreasing and the total peak to peak never exceeds the initial input value - rather than having 5-(-5) the total would be 2.5-(-2.5)
first of all, thank you for your video it's very helpful, I just have a question about the source of the common-mode voltage as we know we apply just the differential voltage between the two wires but the common one exist too
good morning your videos are wonderful, do you happen to have one that measures the thd of an amplifier between the input and output Vsin signal) the classic settings I'm using don't work or in any case I find anomalies. grazie
differential noise and differential signals are different. Correct? It seems like common mode and differential mode usage depends on what we are talking about, noise, signal, rejection ratio etc. which makes it confusing
Hell FesZ,
So, in the real world if you have a class I device or a class II device you would make these measurements with respect to chassis i.e. you would use two probes with each of their grounds connected to chassis? The two signals (sig1 and sig2) are representing the signal and return path correct?
how to view the addition and subtraction of two channels on spectrum analyzer
You can do that only if first you use a passive or active circuit that processes the 2 signals. There are some commercial products that can achieve this.
Very good, but you stopped just before the most useful part!
In the mean time, part 2 did come out - ua-cam.com/video/fhPTnoNQG_A/v-deo.html
@@FesZElectronics Perfect, thanks! I did search but with the wrong search term.
Dutch?
No, Romanian