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Filter with three-stage cascade structure

A cascade structure and filter technology, applied in the field of filters, can solve problems such as the inability to meet the development trend of modern electronic products, and achieve the effects of reducing area and power consumption, improving output accuracy and improving performance

Pending Publication Date: 2021-05-28
NORTHWEST UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

However, although this traditional structure can achieve good performance, the degree of optimization of power consumption and area is certain, and it cannot meet the development trend of modern electronic products.

Method used

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  • Filter with three-stage cascade structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Embodiment 1: see Figure 9 , first use MATLAB / Simulink software to build a simulation platform, the sampling frequency is 25.6KHz, the passband cut-off frequency is 90Hz, the oversampling rate is 128, the modulator is set to 4th order, the quantizer in the modulator is 4 bits, and the CIC filter The decimation rate is 32, and a two-stage half-band filter is used. The decimation rate of the half-band filter is 2, and the final output precision is 24 bits.

[0089] According to the non-recursive structural transfer function of the CIC filter, it can be obtained:

[0090]

[0091] Let M be the extraction rate of the first level, and 32 / M be the extraction rate of the second part:

[0092] first level Extending the first level to the general case, we can get

[0093] the second part

[0094] So the overall transfer function is:

[0095] Since the quantizer of the modulator is 4 bits, the output of the quantizer is the input of the digital filter, so the ...

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Abstract

The invention discloses a filter with a three-stage cascade structure, which adopts a three-stage cascade structure of a cascade integrator comb (CIC) filter, a cosine cascade filter, a linear interpolation second-order polynomial (ISOP) and a half-band filter, and improves the CIC filter, the cosine cascade filter and the half-band filter, and therefore, the area and the power consumption of the whole hardware are reduced, the performance of the digital filter is greatly improved, and the purpose of improving the output precision is achieved.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a filter with a three-stage cascaded structure. Background technique [0002] With the rapid development of computer, communication and multimedia technologies, the degree of digitalization in the global high-tech fields is continuously deepening. High-precision analog-to-digital converters have been widely used in the modern electronics industry, such as radar, audio and video signal processing, high-speed and high-resolution video and image display, military and medical imaging, sonar, communications and other fields. A high-precision ADC is required. The resolution of the analog-to-digital converter will directly determine the performance of these systems, so it is undoubtedly a very critical component for modern electronic systems. [0003] According to the sampling rate, analog-to-digital converters (Analog-to-digital, ADC) can be divided into two categories. Those whose s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02
CPCH03H17/0291
Inventor 张志勇赵诗雨马晓龙齐晓斐王静茹白海庭赵彦博赵武闫军锋翟春雪杭殿坤杨浩浩李天真
Owner NORTHWEST UNIV
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