Filters are used in every industry in different ways and for different purposes. Similarly, BPFs (Band Pass Filters) are also used as a filter but, they filter signals instead of any physical component or data. A BPF is the combination of a HPF (High Pass Filter) and a LPF (Low Pass Filter).
In technical language, Band Pass Filter is an electronic device that let only those signals to pass through which are within a particular frequency range. It is commonly used in wireless transmitters and receivers to eliminate the signals of undesired frequencies that cause interference. There are many types of BPFs such as Wide Band Pass Filters, Narrow BPF 0, Active, Passive, Linear, Non-Linear, Time-Variant, Time-Invariant, Analog, and Digital Band Pass Filter, etc. The user can pick any of them on the basis of his requirement. Wide and Narrow BPFs are the most commonly used filters.
A Wide Band Pass Filter is formed by cascading lowpass and highpass sections in an alternative circuit. A Narro Band Pass Filter is also known as ‘Multiple Feedback Filter’ because it has two feedback paths and uses only one operational amplifier while employing multiple feedbacks.
A Band Pass Filter is applied to achieve many purposes. Here are the applications of BPF –
1. It helps to prevent the transmitter from interfering with other stations at adjacent frequencies by limiting the bandwidth of the o/p signal.
2. In a receiver, it lets only the signals of required frequency to pass.
3. It optimizes the signal-to-noise ratio and sensitivity.
4. It is used in Sonar, Seismology, EEGs, Electrocardiograms, lasers, LIDARS, and Audio Signal Processing, etc.