Bandpass filter

  
The input signal is applied through R3 to the inverting input of the summing amplifier and the output is taken from the first integrator. The summing amplifier will maintain equal voltage at the inverting and non-inverting inputs. Defining 1/R1C1 as 1 and 1/R2C2 as u>2> th^ is now a convenient form to look at the center-frequency 0 and filter Q.
Bandpass filter - schematic

The frequency response for various values of Q is shown.




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