Design of a decimation filter used in ΣΔADC
Zeng Jian · Application of Electronic Technique · 2008
The kind of decimation filter which is used in high-order ΣΔADC is given.Considering the hardware implement and minimize the power dissipation,techniques are applied to optimize the CIC filter structure.The FIR droop correction filter is also present to correct the pass band droop of CIC filter.The speed of this filter is improved and the area is minimized by using the correct circuit structure.Results from Matlab simulation show that the filter has stop band attenuation of 65dB,pass band rip- ple of±0.05dB and transition band of 0.454fs～0.583fs.Aecording to the simulation of VerilogXL and system,the filter absolutely meets the requests of high-order ΣΔADC.