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Research on cascaded COSINE filter in decimation filter

Liu Jun

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Abstract

In order to solve the problem that side lobe suppression of traditional Cascaded Integrator Comb(CIC) filter is not enough in high-speed decimation filter system,this paper compares cascade COSINE decimation filter and principle derivation of conventional CIC decimation filter,and analyses that cascade COSINE filter has great similarities with CIC filter on the frequency characteristics,along with a good low-pass characteristics and the implementation of hardware,meeting the case of high-speed decimation filter.According to the simulation by MATLAB,it can obtain that during taken the 32-fold integer,the first side lobe attenuation of cascade COSINE filter is about 2 times that of traditional CIC filter.That means,cascade COSINE filter has better side lobe suppression than that of conventional CIC filter.

About this research paper

What this paper is about

In order to solve the problem that side lobe suppression of traditional Cascaded Integrator Comb(CIC) filter is not enough in high-speed decimation filter system,this paper compares cascade COSINE decimation filter and principle derivation of conventional CIC decimation filter,and analyses that cascade COSINE filter has great similarities with CIC filter on the frequency characteristics,along with a good low-pass characteristics and the implementation of hardware,meeting the case of high-speed decimation filter.According to the simulation by MATLAB,it can obtain that during taken the 32-fold integer,the first side lobe attenuation of cascade COSINE filter is about 2 times that of traditional CIC filter.That means,cascade COSINE filter has better side lobe suppression than that of conventional CIC filter.

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Available abstract

In order to solve the problem that side lobe suppression of traditional Cascaded Integrator Comb(CIC) filter is not enough in high-speed decimation filter system,this paper compares cascade COSINE decimation filter and principle derivation of conventional CIC decimation filter,and analyses that cascade COSINE filter has great similarities with CIC filter on the frequency characteristics,along with a good low-pass characteristics and the implementation of hardware,meeting the case of high-speed decimation filter.According to the simulation by MATLAB,it can obtain that during taken the 32-fold integer,the first side lobe attenuation of cascade COSINE filter is about 2 times that of traditional CIC filter.That means,cascade COSINE filter has better side lobe suppression than that of conventional CIC filter.

Key concepts: Decimation, Raised-cosine filter, Capacitor-input filter, High-pass filter, Butterworth filter, Filter (signal processing), Filter design, Cascaded integrator–comb filter

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