So I have the following schematic. Basically what it does is , first it has an oscillator that produces a triangular wave (not from op amp output , but by taking a wire after the capacitor C1) . After that we have a band pass filter that is used to take the high frequencies and the DC offset from the signal , so we produce an AC sine wave. My question is for the third part(the red highlighted one) . I am asked to use a second order low pass filter like the one in the schematic. Why is that , why wouldn't I use a first order low pass filter , is there a difference in the wave if we use a first order low pass filter instead of a second order?
Εdit: I looked up the wikipedia entry which states:" The Bode plot for this type of filter resembles that of a first-order filter, except that it falls off more quickly." Can this be explained using the Xc (capacitive reactance) and solving the circuit?