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Example-9

Example-9
Design an active notch filter to eliminate 120 Hz hum (noise). Take the bandwidth, BW = 12 Hz.
Solution
Here, fr = 120 Hz, BW = 12 Hz, Q = Description: 6301.png
 
The gain of the filter in the pass-band will be maximum of 1,
 
AF = 1.
 
Let , C1 = C2 = 0.1 μF
R = Description: 6313.png
 
Rf = 2R = 265.32 kΩ
 
Rr = Description: 6319.png = 663.3 kΩ
 
Now, let R’ = Description: 6325.png = 1 kΩ (arbitrary)
 
So, R” = Description: 6331.png = 1kΩ
 
Thus the filter will pass all frequencies from (0 – 114) Hz and 126 Hz onwards.
 




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