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Help: About second-order filter

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Hi all ^6^
The transfer function of low-pass transfer functions can be written as:
**broken link removed**

Question 1:Q is the quality factor of the second-order filter stages. The frequency W0 is the cutooff frequency, Wc, of the low-pass filter.~~~why ??

Question 2: In RLC filter circuit, sometimes W0 is the same with the resonant frequency, but sometimes it is not ~~~ why ??

Thanks
 

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