Question: It is required to design an allpass filter satisfying the given linear delay
D(ω) = -0.48ω + 4.6 1 ≤ ω ≤ 6
A computer optimization program provides the needed parameters as follows: one first-order section with a = 3.5 and four second-order sections each having a Q of 0.5 and frequencies 3.2.3.8, 4.5, and 4.8.
(a) Design the normalized circuit to satisfy the computed parameters.
(b) Frequency scale so that w = I becomes a) = 1000 rad/s, and determine the practical element values for the circuit designed in part (a). Use LM741 opamps and test your design.