![]() ![]() The expression for centre frequency is given as The centre frequency of the BPF is given by the geometric mean of the two cut-off frequencies ![]() It is to be noted here that beyond the two cut-off frequency, the roll-off is 20 dB/decade. Let us now consider an example to determine the cut-off frequency and bandwidth of the bandpass filter.Īs we have already discussed the bandwidth is the difference between the two cut-off frequency. The difference between the two is the frequency band that is passed via BPF whose bandwidth is given byįor a BPF, f H and f L can be formed by using Here we have noticed that the filter has 2 cut-off frequencies i.e., lower cut-off frequency (f L) and upper cut-off frequency (f H). The characteristic of the BPF is shown by the frequency response curve given below: It basically provides difference lower and high cut-off frequency. Generally, bandpass filters are termed as second-order filters due to the presence of 2 reactive components in their circuits. ![]() Thus, by cascading the two different filters, we can have a circuit that passes the band whose frequency is neither too low nor too high. On the contrary, HPF passes the frequency that falls above the cut-off frequency and eliminates the lower band of frequency. LPF basically passes the lower frequency band and completely suppresses the frequency band above the cut-off frequency. ![]()
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