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.
by Jeff Child
by Jake Hertz
by Jeff Child