Cascaded integrator comb filter circuit, filter method and analog-to-digital conversion system

The invention provides a cascade integrator comb filter circuit, a filter method and an analog-to-digital conversion system, and the circuit comprises N integrators, each integrator receives an input signal, and carries out the integration processing of the corresponding input signal; the multiplexer is connected to the output end of each path of integrator and is used for sequentially selecting and outputting the output signals of each path of integrator; the comb-shaped device is connected to the output end of the multiplexer and is used for carrying out differential processing on each path of signals output by the multiplexer in sequence; the multi-path distributor is connected to the output end of the comb-shaped device and is used for sequentially transmitting each path of signals subjected to differential processing to corresponding output ports; wherein N is a natural number greater than 1. According to the invention, a plurality of groups of CIC filters are combined, and a plurality of integrators sha