Medium selectivity notch filter using operational amplifier pole

A medium selectivity notch filter has been proposed. The active RC filter has only one operational amplifier and three resistors with one floating capacitor as passive components. Two floating resistors provide the positive feedback and one grounded resistor is used for independent tuning of Q factor. The amplifier pole frequency is used for designing the circuit and amplifier used is in both positive and negative feedback configuration. The filter can be tuned for a wide frequency range between 10 kHz-250 kHz and a medium Q factor upto 25 is achievable by proposed configuration. The circuit shows low passive parameter sensitivity which is characteristic of a single pole model. PSpice simulations have been presented to verify theoretical analysis.