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Home > Mall Dynamic > Demystifying Bandpass Filters: Function, Applications, And Alternatives
Bandpass source is a circuit that allows the signal to flow between two specific frequencies, although these signals are divided into other frequencies, there are different types of band-pass filters, some band-pass filter designs can be completed by external power supplies as well as integrated circuits, transistors and other active components, they are called active bandpass filters. Similarly, some filters use any type of power supply as well as passive components such as capacitors and inductors, called passive bandpass filters.
Bandpass filters are suitable for wireless transmitters and receivers. In the transmitter can be used to limit the bandwidth of the output signal to the minimum necessary level and transmit data at the preferred speed and form. Similarly, in a receiver, a bandpass filter allows signals in the preferred frequency range to be decoded while moving away from signals of unnecessary frequencies. The signal-to-noise ratio (S/N) of the receiver can be optimized with BPF.
The best example of a bandpass filter circuit is the RLC circuit shown below, which can also be designed by combining LPF and HPF. In a bandpass filter, it needs to be stated that it is a filter, otherwise it is a filtering process. It is different from the passband, which refers to the real part of the affected spectrum. While a perfect bandpass filter has no gain and attenuation, it is a full level passband, which will completely attenuate every frequency outside the passband.
In practice, bandpass filters are not ideal and do not completely attenuate every frequency other than the preferred frequency. In particular, there is a part of the frequency outside the suggested passband that is attenuated but not discarded, which is called the filter roll down, and typically it is specified in attenuation dB per octave, otherwise ten octaves.
In addition, the filter bandwidth refers to the difference between high and low frequencies. The form factor is a fraction of bandwidth calculated with two different attenuation values, used to determine the cutoff frequency, for example, a 20/2dB form factor of 2:1 means that the bandwidth calculated between the 20 dB decayed frequency is twice as much as the bandwidth calculated at the 2dB decayed frequency.
The application of bandpass filter includes the following aspects:
Widely used for wireless transmitters and receivers.
Can be used to optimize S/N ratio (signal-to-noise ratio).
The main purpose of the filter in the transmitter is to limit the bandwidth of the output signal to the selected communication frequency band.
Widely used in optical fields, such as lidar, laser and so on.
The best application is audio signal processing, anywhere a specific range of sound frequencies is required, though except for the rest.
Suitable for sonar, instrumentation, medical and seismological applications.
A communication system used to select a specific signal from a variety of signals.
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