A low power digital filter solution based on CIC filter and FIR filter

A low power digital filter solution was proposed to solve data decimation and signal filtering problem in seismic signal acquisition equipment. The filter system is constructed with four front-end CIC filters, three front-end FIR filters and a back-end FIR filter to meet the requirements of acquisition equipment and geological analysis. The frequency and phase responses of each filter and the whole low power digital filter system are analyzed. The simulation proves that the proposed solution can work well in seismic signal acquisition equipment. The low power digital filter system is also compared to the current on-chip digital filter solution currently in use in the industry in total calculation quantity and front-end calculation quantity. The results show that the proposed solution can radically reduce both total calculation quantity and front-end calculation quantity.