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Filtering device and filtering method of cascaded integral comb filter

A technology of cascading integrator comb and comb filters, applied in the down-conversion technology and the upper field, can solve the problems of waste of logic resources, not making full use of the similarity of CIC interpolation filters and CIC decimation filters, etc.

Active Publication Date: 2011-04-27
钜泉科技(南京)有限公司
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  • Abstract
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Problems solved by technology

[0007] However, the inventors of the present invention have found that in the traditional design, the similarity in characteristics and structures between the CIC interpolation filter and the CIC decimation filter has not been fully utilized, resulting in a waste of logic resources

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  • Filtering device and filtering method of cascaded integral comb filter
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  • Filtering device and filtering method of cascaded integral comb filter

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Embodiment Construction

[0026] In the following description, many technical details are proposed in order to enable readers to better understand the application. However, those skilled in the art can understand that without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.

[0028] Since the frequency characteristics of the CIC filter are only affected by its three parameters: the decimation or interpolation multiple, that is, the R mentioned above; the order of CIC, that is, the N mentioned above; the delay factor, that is mentioned above M. Therefore, when the above three parameters are fixed, the frequency charact...

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Abstract

The invention relates to the communication field and particularly discloses a filtering device and a filtering method of a cascaded integral comb filter. In the invention, by the multiplexing of a cascaded integrator and a cascaded comb filter contained in a cascaded integral comb filter, the same cascaded integral comb filter can work as a cascaded integral comb extraction filter or as a cascaded integral comb interpolation filter so as to avoid arranging a cascaded integral comb filter in a receiving channel or a sending channel and favorably save logic resources and decrease the cost while reaching performance indexes.

Description

technical field [0001] The invention relates to the communication field, in particular to the up- and down-conversion technology in the communication field. Background technique [0002] Digital Down Conversion (DDC for short) and Digital Up Conversion (DUC for short) are one of key technologies in a communication system. Such as figure 1 As shown, in a digital transmitter, the baseband data passes through DUC to increase the sampling rate, then passes through CFR (crest factor attenuation) and DPD (digital predistortion), and then passes through frequency mixing and DAC (digital-to-analog converter), which will be useful The signal is moved to RF (radio frequency) for transmission; at the receiving end, after the signal is converted from analog to digital (AD), it is sent to baseband processing through DDC. [0003] Among them, DDC mainly includes frequency mixing and decimation filtering process, in which the decimation filter is generally composed of a cascaded integral...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02
Inventor 马涛
Owner 钜泉科技(南京)有限公司
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