Design of Cic Compensation Filter for Decimation Filter

This paper presents the efficient modification in the frequency response of CIC compensation filter. The Compensation filter design consist of FIR filter as cascade after CIC filter. . A FIR filter that has a magnitude response inverse of the CIC filter can be applied to achieve frequency response correction . As proposed filter has only three coefficients so less computation is required. The decimation factor of the CIC filter is M . The performance of the compensation filter depends on the value of a which is obtained by minimizing corresponding error function. Filter coefficient can control the desired pass band droop of the overall decimation filter. The resulting structure is multiplier less and exhibits small pass and droop in comparison to CIC filter. The Cascaded integrator comb filters do not require any multiplier circuits and hence are very economical for implementation in hardware and the problems with cascading faced by the accumulate .A functional model of the CIC compensation filter is developed using the MATLAB program. The paper will describe a mode composed of integrator comb pairs, and it is based on a floating point mathematical algorithm. A series of tests are carried out on this model. Final results show that the CIC compensation filter is a low-pass filter, and its frequency response depends on the number of integratorcomb stages N . As N increases , the CIC compensator has greater stop band attenuation but a less flat pass band. Paper will presented that in the A/D devices no. of analog stages can run at Iower power as International Journal of Computer Engineering Science (IJCES) Volume 2 Issue 11 (November 2012) ISSN : 2250:3439 https://sites.google.com/site/ijcesjournal http://www.ijces.com/ 40 compared to digital stages, they are normally more costly because of a number of manufacturing problems in such component.