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By Ashik
Filter
It is an electronic circuit used to separate out signals of different frequencies.
Types :
(1)High Pass
(2) Low Pass
(3) Band Pass or Notch
                                                                   (4) Band reject
RC High Pass Filter

 

Cutoff frequency or -3db frequency : at which the output power is half of the input
db = 10 log10 (P2 / P1)
= 10 log10 (1/2) = -3



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