Active Filters:
Active filters are made by using the active components i.e operational amplifiers.
Passive Filters:
Passive filters are made by using passive components i.e capacitor, resistor, and inductor.
Active High Pass Filter:
An active high pass filter is shown in attachment. When the input with the high frequency is applied then the capacitive reactance will be low and signal will pass. When input frequency will be low capacitive reactance will be high. So, It will not allow to pass the Signal.
Designing:
The cuttoff frequency of this filter is given below:
[tex]f = 1/2\pi RC[/tex]
It is always known the cutoff frequency of the required filter. Hence, by supposing R we can find the C for this active high pass filter.
Gain:
As this is non-inverting amplifier so, its gain will be
[tex]A = 1+ Ri/Rf[/tex]
