Electronics > Beginners
The Biquadratic filter
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promach:
I am reading an article on biquadratic filter. The article is attached in this post
How do we derive corner frequency equation (6) on page 2 ?
Does it have to do with equation (5) ?
JS:
Make the |H(jw)|=-3dB or (6)=0.5, which is the same. Find for which frequencies that's true, build (6) from there.
Algebra can be quite confussing for this things, mostly because is not that you are after an answer but the shape of the equation, to be easy to read, so some variable manipulation is needed, not just moving around stuff.
JS
The Electrician:
Set the right side of (5) equal to .5 and solve for omega:
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