Cascade integrator comb filter and implementation method thereof

Abstract

The invention provides a cascade integrator comb filter and an implementation method thereof. The cascade integrator comb filter if of a composite structure comprising an FIR (Finite Impulse Response) structure and an IIR (Infinite Impulse Response) structure which are connected in series with each other, and comprises a first sub-cascade integrator comb filter of the FIR structure at the front end, and a second sub-cascade integrator comb filter which is located at the rear end, connected in series with the first sub-cascade integrator comb filter and is of an IIR structure. Compared with the prior art, the cascade integrator comb filter is capable of overcoming the defects of the existing single structure (FIR structure or IIR structure) with the advantages thereof, thereby achieving high speed through the change of area; and balance is realized between realization cost and power consumption; and therefore, the optimal performance cost is obtained.

Description

technical field [0001] The invention relates to the field of variable-sampling digital filtering, in particular to a cascaded integral comb filter and its realization method which balance power consumption and area to obtain the best cost performance. Background technique [0002] In many fields such as digital communication, digital filters are usually used to improve communication quality. Filter design indicators mainly include transition bandwidth and sidelobe amplitude. Filter design generally hopes to obtain as narrow a transition bandwidth as possible and a lower sidelobe amplitude. However, reducing the transition bandwidth and suppressing the sidelobe amplitude cannot be achieved at the same time. Usually, the transition bandwidth is increased in exchange for sidelobe suppression. For example, the sidelobe amplitude can be suppressed by adding a window function, but at the same time, the transition bandwidth is increased. In order to reduce the transition bandwidth...

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Problems solved by technology

[0009] In this kind of CIC filter with FIR structure, as the speed decreases sequentially, the bit width gradually increases. In this way, the bit width requirement is low at the high-speed end; but its disadvantage is that if the frequency reduction multiple is large, this The series structure of the CIC filter of the FIR structure will be too long, that is, the total demand for internal registers will increase rapidly as the number of stages increases.

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