Efficient sharpening of CIC decimation filter

We propose an efficient sharpening of a CIC decimation filter for an even decimation factor. The proposed structure consists of two main sections: a section composed of a cascade of the first-order moving average filters, and a sharpening filter section. The proposed decomposition scheme allows a sharpening section to operate at half of the input rate. In addition, the sharpened CIC filter is of length that is half of that of the original CIC filter. With the aid of the polyphase decomposition, the polyphase subfilters of the first section can also be operated at the half of the input rate.

[1]  Hannu Tenhunen,et al.  A fifth-order comb decimation filter for multi-standard transceiver applications , 2000, 2000 IEEE International Symposium on Circuits and Systems. Emerging Technologies for the 21st Century. Proceedings (IEEE Cat No.00CH36353).

[2]  J. Kaiser,et al.  Sharpening the response of a symmetric nonrecursive filter by multiple use of the same filter , 1977 .

[3]  R. Hamming,et al.  Sharpening the response of a symmetric nonrecursive filter by multiple use of the same filter , 1977 .

[4]  Letizia Lo Presti,et al.  Efficient modified-sinc filters for sigma-delta A/D converters , 2000 .

[5]  E. Hogenauer,et al.  An economical class of digital filters for decimation and interpolation , 1981 .

[6]  Keshab K. Parhi,et al.  VLSI digital signal processing systems , 1999 .

[7]  T. Saramaki,et al.  A modified comb filter structure for decimation , 1997, Proceedings of 1997 IEEE International Symposium on Circuits and Systems. Circuits and Systems in the Information Age ISCAS '97.

[8]  Sanjit K. Mitra,et al.  Digital Signal Processing: A Computer-Based Approach , 1997 .

[9]  Alan N. Willson,et al.  Application of filter sharpening to cascaded integrator-comb decimation filters , 1997, IEEE Trans. Signal Process..