Analog Filters (Part 2)

Playlist (with all related videos): • Electronic Circuit Des...
This tutorial is the continuation of the video series on passive, analogue filters. Advantages and problems of higher-order filters are explained by the Bode diagram and the phasor diagram. In addition we discuss using colis appart from capacitors for filter design. The occurrence of resonance is discussed, using combined LC filters. Based on this, the advantages and disadvantages of various filter characteristics, such as Bessel, Butterworth and Chebyshev filters are described. As application examples we discuss L-, T-, and Pi-filters, as well as a circuit of an AM radio.
Tutor: Michael Fuchs
Chapters:
0:00 Intro
1:15 Higher Order Filters
3:21 Cascading Passive Filters
4:55 Filters with Inductances
8:15 Filter Characteristics
10:49 Considerations in Filter Design
12:02 Applications
15:22 Practical Example: AM Radio
17:17 Outlook on Active Filters
Solution for example with Pi filter:
Z_Source (very high) and Z_Load (very high)
Additional links:
- Filter design tools:
rf-tools.com/lc-filter/
www.analog.com/designtools/en...
- Passive crossover filters for speakers:
www.diyaudioandvideo.com/Tuto...
- Active filters:
www.electronics-tutorials.ws/...
- DIY AM Radio:
dulluhan.github.io/2016/11/12/...
- Institute of Electronics / TU Graz:
ife.tugraz.at
www.tugraz.at
- Like us on Facebook:
/ ife.tugraz.at
Production: TU Graz - Educational Technology

[@johnlong5676]

Great video ! I hope you will have more videos on filters.
Your explanations are crystal clear. Good job

[@taylorstechtalks8456]

This was fantastic! extremely clear and well-constructed. The format was easy to follow and the presentation was of a very high quality! Please continue to do these videos, it's so difficult to find quality content like this!

[@michaelfuchs441]

Thank you very much! I'm so glad you like it.

[@rubenguerrerorivera7462]

Amazing video!
There's a lot of useful information and very valuable in practical applications!
I wished I had run into your videos before!

[@ife.tugraz]

Thank you very much! If you don't want to miss out on our latest videos, we have a new channel with new videos every week:
ruclips.net/user/IFETUGraz

[@CircuitShepherd]

👍

[@Rene_Christensen]

The main issue with cascading first-order filters is that you can only have real poles, not complex, so it will be low Q always.

[@juliano3251]

Why should z_in > 10 * z_out? Why the factor 10? I don't understand

[@ife.tugraz]

This is just a rule of thumb, an engineer's estimate if you will. Usually engineers are not interested in perfect solutions, as they would not work in most cases, and this is a perfect example of such an imperfect solution. If one wants to guarantee that the filter stages have absolutely no influence on each other, Z_in would have to be infinite, and Z_out zero. Since this is not possible, we simply look for a solution that is "good enough". The factor 10 is arbitrarily chosen (you can also take 20), but in any case good enough.