The transfer function of the second-order bandstop filter is given by
Normalized component values:
R1 = R2 = 1 ?, R3 = 0.5 ?, C1 = C2 = a = 1 F, C3 = 2a = 2 F, RB = 1 ?, RA = K-1 = 0.7272 ?, RD = 1 ?, RC = K-1 = 0.7272 ?
Let km = 1000. kf = ?0 = 21022.3844 rad/s. After magnitude and frequency scaling, we obtain
R1 = 1 k?, R2 = 1 k?, R3 = 500 ?, RB = 1 k?, RA = 727.1668 ?, C1 = 76.2433 nF, C2 = 76.2433 nF, C3 = 2a = 0.1524865 ?F, RD = 1 k?, RC = 727.1668 ?
The PSpice schematic for the circuit is shown below along with the magnitude response.
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