29-05-2013, 03:44 PM
FILTERS
FILTERS.pptx (Size: 253.92 KB / Downloads: 18)
INTRODUCTION
A Filter is frequency selective network that freely passes the desired band of frequencies while almost attenuating all other bands.
TERMS USED IN FILTERS:
1).Pass Band
2).Stop/Attenuation Band
3).Cut-off frequency
Classification of Filters
LPF(Low Pass Filter)
HPF(High Pass Filter)
BPF(Band Pass Filter)
BSF(Band Stop Filter)
HPF
HPF stands for “High Pass Filter”.
It allows to pass all the frequency above cut-off
frequency fc.
It attenuates all the frequency which is lower than fc.
HPF is exactly opposite of LPF.
With the change in elements of LPF, It becomes HPF.
In case of practical filter
1).Some signal is present in stop band.
2).Some attenuation is present in pass band.