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. Quality factor Q equals the center frequency divided by the bandwidth, Q = fC / BW.
The greater Q value, the better the frequency selectivity, the smaller the bandwidth. Anti-vice versa. So that the center frequency fc, is calculated as follows:
Among
With this tool, you can:
Input gain GAIN, the bandwidth BW, the center frequency F, the capacitance C, calculation of active band pass filter resistance R1, R2, R3:
| Capacitance C | ||
| Gain GAIN | ||
| Bandwidth BW | ||
| Center frequency F | ||
| Resistor R1 | ||
| Resistor R2 | ||
| Resistor R3 | ||
Input circuit component values C, R1, R2, R3, calculated active band-pass filter gain GAIN, quality factor Q, center frequency Fc:
| Resistor R1 | ||
| Resistor R2 | ||
| Resistor R3 | ||
| Capacitance C | ||
| Gain GAIN | ||
| Bandwidth BW | ||
| Center frequency F | ||