I knew that, it is a filter order, I would like consider this like a example and I have to derive filter order for my circuit. So that's why I asked how to derive that.N is the filter order.
Since there are no “non-integer” filter orders, you round UP to the next integer.
Ofcourse, I can use it, But I would like to learn how to derive that, to derive for my circuits.
Hi LvW,The formula you have shown (magnitude of H_lp) applies for Butterworth filters only.
The general expression for the magnitude of a Butterworth response is
|H(jw)| = 1/[SQRT(1+Ω to the power of 2n)].
The quantity Ω is the frequency parameter - normalized to the defined cut-off.
So - when the required magnitude is given you can solve for another unknown (in ths case "n").
Applying the antilog function we have an equation:Hi LvW,
Here, the problem is I don't know how to solve the 'n' value. I'm asking you to help me how to solve the 'n' value and if explain step by step it's grateful.
Thank you.