D *14.69 Consider the bandpass circuit shown in Fig. 14.27(a). Let C1 = C2 = C, R3 = R, R4 = R/4Q2, and CR = 2Q/ω0. Disconnect the positive input terminal of the op amp from ground and apply Vi through a voltage divider R1, R2 to the positive input terminal as well as through R4 as before. Analyze the circuit to find its transfer function Vo/Vi. Find the ratio R2/R1 so that the circuit realizes a notch function.