Abstract
This contribution puts forward a new proposal for Current Feedback Operational Amplifier (CFOA) based Low pass (LP) and High Pass (HP) Fractional Step Filters (FSFs). The proposed filters are designed by approximating the fractional Laplacian operator by an appropriate integer order transfer function. Subsequently, functional block diagram (FBD) approach is used for CFOA based realization of LP and HP FSFs of order (1 + α). Higher order FSFs are realized by cascading FSF of order (1 + α) with higher integer order filters. To illustrate this, CFOA based LP (HP) FSFs of order (5 + α) are obtained by cascading LP (HP) FSFs of order (1 + α) with proposed leapfrog realization of 4th order LP (HP) filter. The proposal is verified through SPICE simulations and experimentation. Stability, sensitivity and non-ideal analyses are also included.
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