Design of A Decimation Filter Based on Wideband Signal
Fen Li · Shipboard Electronic Countermeasure · 2015
Cascaded integral comb(CIC)filters are widely used in high-speed decimation and interpolation operation due to the simple structure and fewer logical resources,but its amplitude-frequency response difficultly meets the anti-aliasing properties in dealing with broadband signals.After analyzing the traditional CIC filter structure and power spectrum density,this paper proposes a modified filter which uses sharpening cascaded integral comb(SCIC)technology to strengthen stopband attenuation and adds intertolated second polynomials(ISOP)compensator to reduce the in-band tolerance,discusses the hardware architecture of field programmable gate array(FPGA)realization and the bit width of register.The simulation verifies that the modified filter has better characteristics of pass-band and stop-band.