I understand that this is 1/root2 but I'm not sure where it comes from or how it is derived.
2006-10-24 05:43:35 · 3 answers · asked by Om 5 in Science & Mathematics ➔ Engineering
The q factor can actually be anything that you want it to be.
You do not say what you are designing but let us assume that it is a 2nd order filter using an op-amp.
q will be dependent upon the DC gain (Ho) such that
q = 1/(3 - Ho)
Ho should be kept below 3. If a value above 3 is used than there will be poles in the right-hand half plane and the filter will be unstable.
A value of 0.707 for q is used because this will give the flattest response in the pass-band. If you have software like P-Spice, you can demonstrate this to yourself.
2006-10-24 06:11:54 · answer #1 · answered by Stewart H 4 · 0⤊ 0⤋
Hi. That number is equal to the square root of 2 divided by 2. This is half the hypotenuse of a right triangle with the 2 sides equal to 1. I would expect the filter uses trig in its calculation of 'q'.
2006-10-24 05:51:31 · answer #2 · answered by Cirric 7 · 0⤊ 0⤋
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2016-11-25 02:13:11 · answer #3 · answered by clance 3 · 0⤊ 0⤋