It is the difference between both cutoff frequencies of the band pass or band reject filter. The width of the frequencies before (in case of low pass filter) or after (in case of high pass filter) the cutoff frequency is called bandwidth The range of frequencies that are passed (in case of bandpass filter) without any attenuation or the frequencies that are attenuated (in case of band reject filter) is called the bandwidth of the filter. In fact, it is the arithmetic mean of both cut-off frequencies. It lies in-between the two cut-off frequency i.e. The frequency that lies at the center of the passband or stopband in a bandpass filter or band reject filter respectively is called center frequency. Related Post: Types of Passive Low Pass Filters.Bandpass filter does not allow frequency after this point, whereas the band stop filter allows it. The upper frequency at which the output power is reduced by ½ of the input power. Bandpass filter allows frequency after this point, whereas the band stop filter blocks it. The lower frequency at which the gain of the filter is half or -3db. In a band pass or band reject filter, there are two cutoff frequencies. And it is the frequency where the power of the output signal becomes half the power of the input signal. It is also known as “ -3db frequency” because -3db represents half power. The output signal’s voltage at the cutoff frequency is 70.7% of the input signal’s voltage. The passband & stopband are distinguished from each other by the cutoff frequency or corner frequency. Related Post: Types of Active Low Pass Filters.Some of the terms used in describing the characteristics of a filter are given below To understand the frequency response of a filter, you need to have an idea about the terms used in it. A frequency filter or also known as a frequency selective circuit is a special type of a circuit, which is used for filtering out some of the input signals on the basis of their frequencies.Ī filter circuit passes some frequency signal’s without any attenuation (Reduction in amplitude) or with some amplification, & attenuate other frequency depending on the types of the filter.
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