A new structure for the design of wideband variable fractional-order FIR differentiators

In this paper, a new structure is proposed for the design of wideband variable fractional-order (VFO) FIR differentiators. Part of subfilters in the conventional structure are replaced by the cascade of a prefilter and the modified subfilters, such that the performance of the designed system can be improved as well as the computational cost can be reduced. Several examples will be presented to demonstrate the effectiveness of the proposed method.