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Method for evaluating frequency response characteristic of analog filter

An analog filter and frequency response technology, applied in the field of filters, can solve the problems of increased data processing, obvious time consumption, complex FFT operation, etc., and achieves the effects of fast determination, low-cost performance, and simple structure.

Inactive Publication Date: 2014-02-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the FFT operation is generally more complicated and takes a certain amount of time to complete, especially when the number of FFT points is large, the time consumption is more obvious, and the amount of data processing will also increase significantly

Method used

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  • Method for evaluating frequency response characteristic of analog filter
  • Method for evaluating frequency response characteristic of analog filter
  • Method for evaluating frequency response characteristic of analog filter

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Embodiment

[0020] figure 1 It is the principle block diagram of the method of the present invention for estimating the frequency response characteristic of the analog filter.

[0021] In this embodiment, as figure 1 As shown, the method for estimating the frequency response characteristic of an analog filter according to the present invention is characterized in that, it comprises the following steps:

[0022] (1) Configure three analog-to-digital converter ADCs, and connect the output end of the analog filter H(s) to the input end of the first ADC;

[0023] (2), the input frequency is f at the input end of the analog filter and the input end of the second ADC i Sinusoidal signal x si (t), the signal x′ filtered by the analog filter si (t) is sent to the first ADC, and the input frequency is f at the input end of the third ADC i cosine signal x ci (t), where i=1,2,...,N, where N is the total number of frequency points. if x si (t)=sin(2πf i t), x ci (t)=cos(2πf i t), the adopt...

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Abstract

The invention provides a method for evaluating a frequency response characteristic of an analog filter. The method comprises the steps as follows: the analog filter is connected with analog-digital converters; a sinusoidal signal is respectively sent to an input end of one analog-digital converter and an input end of the analog filter; a cosine signal is sent to an input end of another analog-digital converter; frequency of the sent sinusoidal signals and cosine signal are similar; the signals quantized by the analog-digital converters are subjected to mutual correlation and averaging; and an amplitude-frequency response and a phase-frequency response of the analog filter are obtained through calculation, so that an amplitude-frequency characteristic and a phase-frequency characteristic of the analog filter can be determined accurately and rapidly.

Description

technical field [0001] The invention belongs to the technical field of filters, and more particularly, relates to a method for estimating the frequency response characteristic of an analog filter. Background technique [0002] A filter is a device used to eliminate interference noise. The input or output is filtered to obtain pure alternating current. Any device capable of signal processing can become a filter. In modern telecommunications equipment and various control systems, filters are widely used; among all electronic components, filters are used the most and have the most complex technology. The quality of the filter directly determines the quality of the product. Therefore, the research and production of the filter has always been valued. [0003] Analog filters can be divided into passive and active filters. Passive filters are mainly composed of passive components resistors, inductors and capacitors. Active filters are mainly composed of integrated operational am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02
Inventor 郭连平王志刚罗光坤刘涛邓小飞
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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