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A CIC filter and realizing method therefor

An implementation method and filter technology, which is applied in the electronic field, can solve the problems of CIC abnormal state, large resource occupation, and large processing delay, and achieve the effects of optimizing the implementation structure, saving resources, and reducing processing delay

Inactive Publication Date: 2008-10-22
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] 1. It takes up a lot of resources and has a large processing delay;
[0013] 2. When the clock is abnormal, it will cause the CIC integrator to enter an abnormal working state, and because the integrator has a memory effect, this abnormal state will always exist, and the CIC will always be in an abnormal state and cannot be recovered

Method used

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  • A CIC filter and realizing method therefor
  • A CIC filter and realizing method therefor
  • A CIC filter and realizing method therefor

Examples

Experimental program
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Embodiment 1

[0048] Such as image 3 As shown, according to the method of the present invention, the m-level cascading realizes the difference of d times, and the simplified CIC filter structure schematic diagram with self-recovery function of abnormal state. COMB in the figure is a comb filter. INTEG is the integrator. The structure of this embodiment includes m-1 comb filter and m-1 integrator, a keeper, a reset signal generator and a redundant integrator of the last stage integrator.

[0049] The comb filter and the integrator are respectively cascaded, and the keeper is connected in series between them, and the data is output through the comb filter, the keeper, and the integrator in turn to realize the filtering function. Each comb filter or each integrator has the same structure, and the processing fixed-point bit width of each stage can be calculated by formula (1) and formula (2).

[0050] The basic principle of the keeper is as follows: Assuming that the m-level CIC implements ...

Embodiment 2

[0059] According to the method of the present invention, the realization structure of the CIC that 5 levels of cascading realizes 4 times of interpolation can be simplified as Figure 4 structure shown. In this embodiment, the reset signal generator is composed of three parts: 1) the high two-bit judgment module, used to judge whether the highest bit and the second highest bit of the output data are equal, and output a reset signal when they are not equal; 2) an equal judgment module, It is used to judge whether the output of the last stage integrator and the output of the redundant integrator are equal, and output a reset signal when they are not equal; 3) or an operation module.

[0060] The bit width of each level is calculated by formula (1) and formula (2), and the calculation results are shown in the following table:

[0061] series

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Abstract

A method for realizing CIC filter, which contains input data signal in a comb filter group composed of plurality of cascade-connected comb filters, input filtered data signal to a retainer, output the data signal from retainer through an integrator composed of plurality of cascade connected of integrators having same number with that of comb filter. Said CIC filter includes comb filter group, integrator group and retainer serially connected between the output end of last stage of comb filter and the input end of first integrator.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a CIC filter and its realization method. Background technique [0002] CIC filter is an acronym for Cascaded Integral Comb Filter. The transfer function of the CIC filter with the number of stages m and the interpolation (or decimation) factor d is: [0003] H ( Z ) = 1 d m ( 1 - Z - d 1 - Z - 1 ) m [0004] Among them, t...

Claims

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Application Information

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IPC IPC(8): H03H17/06H03H17/00
Inventor 李刚孟庆锋刘建华
Owner HUAWEI TECH CO LTD
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