Intro to Filters
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- เผยแพร่เมื่อ 13 มิ.ย. 2024
- #219 This video is the first in a longer series dedicated to looking at electronic filters. In this episode I focus on some of the basics regarding filtrs, look at the various types of filters, their characteristic responses and how the response can vary based on the chosen components. I will also be looking into some of the terms associated with filters regarding their amplitude but also phase response; and of course looking at the various behaviors in the circuit simulator.
Filter series:
Ep1 - Intro : • Intro to Filters
Ep2 - Passive RC Filters: • Passive RC Filters
Ep3 - Active RC Filters: • Active RC-filter Basics
Ep4 - More Active RC Filters: • MORE Active RC Filters
Ep5 - Introduction to LC Filters: • Introduction to LC Fil...
Ep6 - LC filter limitations: • Limitations of LC Filters
Further reading:
www.analog.com/media/en/train...
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In the world of multiple copies/flavour of same thing,you seem to stand out..continue the good work...❤❤
Thanks again. Very well explained. Can't wait to see Ep2.
The story of my life, filters. IF filters, cavity filters, band pass filters, band reject filters, high pass, low pass, filters, filters, filters. Two way radio communications would be all but impossible without filters. Other than repairs I spend most of my days adjusting band pass, band reject and notch filters.
I have a background in microwave circuit design and all I do now in electronics isn't even RF related. I do miss doing RF related things. I was building my own amateur transceiver but went too low jack I couldn't build the PLL side of the transmitter. Planned on 40.66MHz up to 41.7MHz within the ISM band for my region. Strictly analog isn't easy without filters. Too many things to consider. Maybe I'll resume it one day. You can't find enough practical resources online with enough documentation on theory. Most resources focus on one or the other. Aspiring engineers will have to learn things the hard way which I'm fine with honestly, but sometimes doubt in engineering is lethal, we tend to question everything without the ability of feedback on winded explanation of key subjects. Without fine-tuning, we are even lost. Pun intended. 🤣
Coffee Filters
@@weerobot Yep, I forgot those. I use 2 or 3 a day.
Bull$hit filters?! 🤣
Notch?
You are one of the best internet electronics educator! Tank you.
Excellent video. I'm looking forward to the next one.
Can't wait for the next video! This was great!
Excellent and understandable explanation, as always.
I kept thinking that much of the understanding of filter response also applies to acoustic "filters" i.e. tuned ("ported") speaker enclosures.
Indeed, there are a lot of similarities, since both involve waves; as a fun fact, you have SAW/BAW filters where first the electrical signal is converted into an acoustic wave, it travels trough a crystal slab, with various mechanical resonators, before being re-converted into an electrical signal again.
You had a few hundreds subscribers, now > 50k !
Great video, excellent explanation, Thanks!!!
Very good video... and you're right... filters are a complex subject.
Great video, love your content, excellent explanation. Keep it up.
Hello, your videos are amazing, I have learnt a lot from them that engineering never taught, can't wait for further episodes. Will you be including active filters as well?
Indeed, the series is planned to be quite extensive; the first few episodes will cover passive and active RC filters.
@@FesZElectronics Thank you! I really appreciate it!
Very well explained and entertaining too!
thumbs up!
2:05 low pass followed by high pass wouldn't leave any energy for the high pass. I think you meant low pass in parallel with a high pass?
I have to comment on the discussion at the start of the video about combining low pass and high pass filters. The statement that a low pass followed by a high pass results in a band stop filter is, at best, very misleading. The combination of low pass and high pass filters placed in series is always a band pass filter, no matter what order they are placed in. This is provided, of course, that the corner frequencies are appropriate. In order to achieve a band stop filter, the low and high pass filters must be arranged in parallel.
Indeed, you are right, the phrasing is not the best; I was trying to say that from a graphical point of view, you have a low pass corner first, and then a high pass corner; but the exact practical implementation is indeed with 2 filters in parallel...
Muito bom !
muy buen video amiguito
What happens when you concatenate filters? Can you directly overlay their graphs to see the behavior of the resulting filter like they teach us in many courses? I think it should be wrong, as filter designs assume no impedance in the AC voltage source and an unloaded output. My expectation is that combining passive filters will cause them to affect each-other a lot.
Also, what is the actual difference in hardware between all the filter types? I can only assume Butterworth and Chebyshev are edge cases of Cauer. Said in a different way - I expect any randomly generated filter to have elliptical frequency response.
Can you explain intuitively how poles and zeroes are related to the reactive components of the circuit and how resistors shift the poles and zeroes along the attenuation axis on the Laplace plot?
What is the difference in hardware between filters? Passive filters are used in high frequency circuits because they use big coils that don't fit in Integrated circuits, For RLC the functioning is starting with RC/RL in parallel and then put a RC/RL on the ground, you do the maths and one will be zero, so you end up with 2 passive components and a resistor. By the way, to begin a filter design you do the required response frequency map with your bandpass ripple, your transition band wideness and your attenuation band. Then you do the approximation, usually you choose chebyshev/Butterworth (there are more like elliptic, those are popular approximations), they have a particular H(s) that defines the filter, do the maths for the particular requirements and that's it.
For active filters that are more used in low frequency circuits, the integrated ones. There are several active circuits, we have the Kelley key which is an op amp with only resistors and capacitors around. Then we have a transconductance amplifier which converts the voltage difference in their inputs to a current output, we can use several of those ones to create our filter. Then we have this curious one, you wanna remove the coil because they don't fit in, but necessary to filter, what we do is emulate them with op amps, there is the GIC, generator impedance, it's equivalent to a coil. ( I think that it's literally just putting the first RLC setting that I explained you but replacing the coil with a GIC, then you got your emilated RLC that fits in any integrated circuit).
It's better to think with Z transformation than Laplace if you wanna know to plot zeros and poles properly by the way. Anyway, the relationship between the components and the Laplace plot is that the H(s), transference function defines the filter, it give us the zeros and poles, alright, H(s)=Vout(s)/Vin(s) you see this equation right, this is what you are asking for, what you have to do in a filter circuit is finding Vin/Vout ( this includes all the components) and then aplying laplace Vin(s)/Vout(s), you do it replacing jw with s, with this done you got your H(s), you got your filter defined by the components.
@@TOPSTOPI I am sorry, but none of that answered anything I was asking for. I know about passive and active filters. In the video FesZ shows circuit diagrams that look almost identical in netlist, yet their frequency response curves are of 3 different types. The only apparent difference was the level of magnitude difference in component values. I was asking if Cauer would be the curve if all the component values and magnitudes were randomly generated. I don't care about the Laplace or Z domain equations, only the Laplace plot/diagram. AFAIK the locations of the poles and zeroes along the frequency axis correspond to resonant frequencies of LC groups and the other axis determines how fast a tone dies out (a resistor dampens the LC oscillations) or escalates (an active component amplifies the LC oscillations). I was asking how can you quickly determine just by looking at the circuit diagram where exactly on the real component axis a pole or zero would be for a passive filter.
🌟🌷🌟
Hello, i'm a new sub to this chanel, can someone recommend me how should i start watching these videos? From basic to advanced, and from which playlist to begin? Thanks
It's hard to say really. I think just look at whatever video is useful to you maybe in a project you might be doing. Else, just start with whatever one you can understand.
If you're just curious, roll with the whatever makes you interested
start with the introduction to LTSPICE, part of the fun is trying out the gold nuggets shared. Enjoy!
This video was uploaded 43 min ago but i see 2 comments dating back to a day or two earlier. How?
Your time zone.
Its released as early access to Patron supporters a few days before the public release.
@@FesZElectronics Either that or the original poster owns a time machine.
@@mikesradiorepair but i being a poor man, i have only my dreams. No time machine.😆
@@FesZElectronics thank you, it was a stupid question, but i wanted to rule out doubt.
Asianometry th-cam.com/video/L8jmHtfVmPY/w-d-xo.html lately had a nice video about SAW filters (only little related to the basics shown here)
I saw it! I was really nice!
Of course the greatest filter you could design would be the bullshit filter!
what is your favorite beer?
666 beer.