Filter circuit for compensation of predetermined frequency response of cascaded integrator-differentiator filter, comprises cascaded integrator-differentiator filter downstream digital comb filter having comb filter section

摘要

The filter circuit (10) comprises a cascaded integrator-differentiator filter (CIC) downstream digital comb filter (200) having a comb filter section (210). A digital resonator filter (300) is provided as the digital comb filter, where a digital resonator or a parallel circuit of two digital resonators (300-0,300-1,300-2,300-N-1) is provided for the filter circuit. An independent claim is also included for an analog to digital converter with a sigma-delta modulator.