This video started slow with the basics, but ended up making some good points about common mode vs differential mode noise, and pcb track design. Thanks
Hi, nice video. I have a doubt.Why are there two push-button switches on the Demo Board? One is for connecting the GROUND and what is the other switch for?
Thanks. One connects the grounds at both side directly, the other connects the grounds through a capacitor which allows only some of the high frequency content to pass.
Definitely didn't come down as much as I expected it would, but for sure several of the harmonics came down by 10 or more dB. I think one issue is that the connections made by pressing the buttons were far from low impedance - the buttons were on the top side of the PCB, the leaded package inductance would be high and the tracks are very thin - all leading to higher inductance. Some current was still flowing around the ground plane slot. More investigation to be done here for future vids!
Very nice video. Subscribing. There is a confusion I have however. How is that the return current is exactly underneath the track (that is following the path of least inductance) at only 1kHz of the signal in 5:30. I though this effect happens only at higher frequencies which are above 100 kHz. Isn't 1kHz too low for the current to choose the path of least inductance? Thanks
It's a gradual effect as you can see from the simulation. As I mentioned in the vid, if the resolution were higher, I'm sure you'd see a tighter concentration below the wire at 100 kHz. The paper has more information on page 38 (www.jastech-emc.com/papers/IEEE-EMC_TP4_2009.pdf). Maybe I'll do a vid in the future with the EMSCAN unit and a sine wave input to see the effect.
9:30 simple and deep meaning, help to look at EMI issues.
Great to see an actual demo not just theoretical.
Thanks :) That's what this channel is going to be all about!
This video started slow with the basics, but ended up making some good points about common mode vs differential mode noise, and pcb track design. Thanks
Great
subscribed because of the demo!!! Thanks
This is amazing work. So well explained. Thank you!
This is gold! Thanks Andie!
Nice Explaination with practical things
Thanks Andy :-)
Very nice overview, looking forward to seeing more. Cheers
This is really interesting info Andie! Really enjoyed it especially the demo :)
Hi
so nice video, Andy. keep going.
Nice video. Keep them coming 😉
good work! looking forward for more!
Hi,
nice video.
I have a doubt.Why are there two push-button switches on the Demo Board?
One is for connecting the GROUND and what is the other switch for?
Thanks. One connects the grounds at both side directly, the other connects the grounds through a capacitor which allows only some of the high frequency content to pass.
Excellent video, thank you
Great video!
Excellent video. Unfortunately I could see no obvious difference in spectrum in the final experiment.
Definitely didn't come down as much as I expected it would, but for sure several of the harmonics came down by 10 or more dB. I think one issue is that the connections made by pressing the buttons were far from low impedance - the buttons were on the top side of the PCB, the leaded package inductance would be high and the tracks are very thin - all leading to higher inductance. Some current was still flowing around the ground plane slot. More investigation to be done here for future vids!
nice information. thank you.
wow tysm
Hi Andy,
Where’d you get that TEM cell?
Never mind. I believe I found it: www.emcfastpass.com/test-equipment/product-category/gtem-tem-cells/
Very nice video. Subscribing.
There is a confusion I have however. How is that the return current is exactly underneath the track (that is following the path of least inductance) at only 1kHz of the signal in 5:30. I though this effect happens only at higher frequencies which are above 100 kHz.
Isn't 1kHz too low for the current to choose the path of least inductance?
Thanks
It's a gradual effect as you can see from the simulation. As I mentioned in the vid, if the resolution were higher, I'm sure you'd see a tighter concentration below the wire at 100 kHz. The paper has more information on page 38 (www.jastech-emc.com/papers/IEEE-EMC_TP4_2009.pdf). Maybe I'll do a vid in the future with the EMSCAN unit and a sine wave input to see the effect.
EMC FastPass link is broken :(
@@momchilhaymanov4369 Just google the filename
Robert Feranec die some interesting (quite long) videos on this with simulation of power delivery networks and even has some with a demo
too much theoratical