2.3 Band Pass Filter

In some applications, we need to filter a particular band of frequencies from a wider range of mixed signals. For this purpose, the properties of low-pass and high-pass filters circuits can be combined to design a filter which is called as band pass filter.Band pass filter can be developed by connecting a low-pass and a high-pass filter in series as shown in figure 2.6.9.

Figure 2.6.9 Band pass filter

2.4 Band Reject Filter

These filters pass all frequencies above and below a particular range set by the operator/manufacturer. They are also known as band stop filters or notch filters. They are constructedby connecting a low-pass and a high-pass filter in parallel as shown in Figure 2.6.10.

Figure 2.6.10 Band reject filter