Cascaded integrator-comb interpolation filter

Details Cascaded integrator-comb interpolation filter Cascaded integrator-comb interpolation filter

1997-02-25

1999-03-09

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

Data rate conversion

H03M 300

Patent

active

058806873

ABSTRACT:
A cascaded integrator-comb (CIC) interpolation filter is included within a digital-to-analog converter (138) and includes two up-samplers (150, 164). The two up-samplers (150, 164) also include a sample-and-hold function. The first up-sampler (150) up-samples an output of a differentiator (140). The second up-sampler (164) up-samples an output of an integrator (152) This reduces the area and power requirements of the CIC interpolation filter, while providing approximately the same filtering performance in the pass band and transition band. The total over-sample ratio of the CIC interpolation filter is equal to the first up-sampling ratio multiplied by the second up-sampling ratio. The stop band requirements of the CIC interpolation filter determines the relative sizes of the first and second up-sampling ratios.

REFERENCES:
patent: 5592517 (1997-01-01), Camp et al.
patent: 5606319 (1997-02-01), Yatim et al.
patent: 5731769 (1998-03-01), Girardeau, Jr. et al.
Crocherre et al., Interpolation and Decimation of Digital Signals--A Tutorial Review, Proceedings of the IEEE vol. 69 pp. 200-331, Mar. 1981.
Chu et al., Multriate filter Designs Using Comb Filters, IEEE Transactions on Circuits and Systems, vol. CAS-31, pp. 913-924, Nov. 1984.
E. B. Hogenauer; "An Economical Class of Digital Filters for Decimation and Interpolation"; IEEE Transactions on Acoustics, Speech, and Signal Processing: vol. ASSP-29, No.2, pp. 155-162 (1981).

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