Post History
Miss Mulan - I am a bit late with my answer. Nevertheless - there is formula which gives you the necessary filter order "n" - as a function of two frequencies and both associated damping figures. ...
Answer
#2: Post edited
by
LvW
·
2022-08-26T14:33:26Z (over 2 years ago)
- Miss Mulan - I am a bit late with my answer.
- Nevertheless - there is formula which gives you the necessary filter order "n" - as a function of two frequencies and both associated damping figures. If applied to the most simple case (Butterworth approximation) the result is
- **n>1.2**
Hence, a 2nd-order filter topology is required.
- Miss Mulan - I am a bit late with my answer.
- Nevertheless - there is formula which gives you the necessary filter order "n" - as a function of two frequencies and both associated damping figures. If applied to the most simple case (Butterworth approximation) the result is
- **n>1.2**
- Hence, a 2nd-order filter topology is required.
- This sounds plausible because a 1st-order filter has a damping characteristic of 6dB/okt. - however, you require 8 dB.
#1: Initial revision
by
LvW
·
2022-08-26T14:07:12Z (over 2 years ago)
Miss Mulan - I am a bit late with my answer. Nevertheless - there is formula which gives you the necessary filter order "n" - as a function of two frequencies and both associated damping figures. If applied to the most simple case (Butterworth approximation) the result is **n>1.2** Hence, a 2nd-order filter topology is required.