![]() This article describes the low pass filter using op-amp (active element), which is also called an active LPF. ![]() These types of filter circuits come under the passive filter category because the passive elements resistor, capacitor, and inductors are used in the circuit. They are low pass filters, high pass filters, bandpass filters, and bandstop filters. Filter circuits are divided into four types based on the range of frequencies that the circuit would allow while blocking all other frequencies. For example, in radio or tv, a tuning filter circuit rejects unwanted frequencies by allowing only the desired channel. In electronic devices, the filters are the circuits that allow desires frequency components and blocks all other frequency components of a signal.
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