Timeline for Prerequisites to learning Passive and Active Filter Design
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
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| Jan 4, 2020 at 17:16 | comment | added | D.A.S. | although in the early 80’s we did not have these tools and Raised Cosine was a bit of a mystery yet essential for data filters. So we had to read the red guru book by famous Russian author who’s name I forget. | |
| Jan 4, 2020 at 17:08 | comment | added | D.A.S. | I agree @LvW and Falstad’s active filter designer link has the > options > view poles for the builtin filters. it is interesting to see how Chebychev poles when 0dB ripple is chosen and filter shape is similar to Butterworth, just poles are shifted. Removing the Load reveals the Q of each pole. Changing the load value then the slider recomputes for the new load, interactively. So one can get a feel of Poles vs shape of filter much faster. | |
| Jan 4, 2020 at 10:55 | comment | added | LvW | Tony...you have listed several points which are relevant for a good understanding of the various filter functions (bandpass only) and circuits - however, I like to add something: For my opinion, it is very important to understand the concept of poles and zeroes in the complex s-plane - and to know the definitions for "pole frequency" and "pole-Q". As you know, THESE two parameters are listed in all the tables which are available for the different approximations (Butterworth,Chebyshev,...) | |
| Jan 3, 2020 at 20:02 | history | answered | D.A.S. | CC BY-SA 4.0 |