Active Filter: Active Filter is formed by using active element along with the passive components.
Advantages of Active filter over Passive filter: High value of pass band gain can be obtained. It is very easy to select cut-off frequency. They will not produce loading effect because the output impedance is low. They are not using inductor so designing of Active filter is simple, cost is less & they occupy less space.
Pass Band Filter: The frequency range which is permitted to pass is known as pass band.
Stop Band Filter: The frequency range which is attenuated is known as stop band.