I have a 8th order active filter (It includes 4 x 2nd order active filters) and four quality factor. (Q1,Q2,Q3,Q4).
How can I find totally quality factor of 8th order active filter?
quality factor of Filter 1 (Q1) :1,5
How can I calculate quality factor of all stage? Or Are there simple method?
Determining the Q factor requires a bit more information regarding the Bandpass Filter such as Center frequency, Passband width, Stopband width and Attenuation.You might want to check out this Application note for the design of Multiple Order bandpass filters by cascading 2nd order sections, it gives the details on how you can design and calculate the Q factor of each stages.
You may also want to check the Analog Filter Wizard, it lets you put in the desired specification of your filter and gives the optimized circuit and details of each design stage.
Let me know if you have further questions.Thanks Kutay.