Category Archives: RC Filter

Bandpass Filter Calculator

Figure 1 is a negative-feedback second-order multi-active band pass filter, which uses a single general-purpose operational amplifiers (opamp) connected a single power supply mode, easy to implement. It is the upper limit cut-off frequency and lower cut-off frequency can be very close, with very strong frequency selectivity. When C1 = C2 = C, Req =R1//R2. […]