Operational Amplifier Applications Unit 4 – High Pass Filter
A practical high pass filter designed with an op amp also has a high frequency cutoff due to the
op amp's bandwidth limitations.
The high frequency cutoff point depends on the specifications of the particular op amp.
High pass filters are classified by an order number, which corresponds to the number of lead
networks in the circuit.
This high pass filter circuit has 2 lead networks: R2 and C2 and R1 C1.
The attenuation in a high pass filter's stopband increases as the order number increases, as shown
in these Butterworth response curves.