本文選題：有源低通濾波器 + 無漂移　； 參考：《山東大學》2015年碩士論文

【摘要】：濾波是信號處理中一個重要的概念,設(shè)計一個性能良好的濾波器也就成了關(guān)鍵問題。濾波器是一種選頻裝置,可以讓頻率在通帶內(nèi)的信號分量通過,而極大地衰減其他頻率成分。長期以來,在科學與生產(chǎn)活動中,由于低頻微弱信號承載了大量的基礎(chǔ)信息,低通濾波器被廣泛應用于噪聲環(huán)境下的信息獲取和抗干擾設(shè)計。在直流通道中引入低通濾波器,是抑制噪聲,尤其是工頻噪聲的有效方法。然而,無源RC濾波器只能實現(xiàn)極點在負實軸上且為單根的一類特殊傳遞函數(shù),不能適應多樣性的工程要求。因此,有源RC低通濾波器是目前研究最多的低頻濾波系統(tǒng)。然而在引入有源RC濾波器時,信道中會引入由有源部件產(chǎn)生的新的附加漂移。在海洋監(jiān)測、地質(zhì)勘查和生物醫(yī)學等領(lǐng)域的低頻微弱信號傳感、檢測系統(tǒng)和高精確度儀器儀表中,系統(tǒng)的靈敏度通常會達到uv甚至nv量級,這時的附加漂移是跟噪聲一樣嚴重的問題。在設(shè)計濾波器時,我們希望濾波器在通帶內(nèi)具有好的頻率特性,同時響應速度快。在很多應用中,濾波系統(tǒng)的的響應速度是和精度同樣重要的指標。然而,傳統(tǒng)的濾波器實現(xiàn)方法不能滿足這樣的特性。本文的研究目的即建立原理上無信道附加漂移的快響應有源變參數(shù)低通濾波系統(tǒng)理論和實現(xiàn)方法,能夠為實際應用提出可供參考的理論和技術(shù)。本文所做的主要工作包括：(1)在模擬領(lǐng)域,提出了一種任意階無漂移全極點有源低通濾波器,給出電路結(jié)構(gòu)進行原理分析,通過仿真驗證,與傳統(tǒng)有源低通濾波器相比較,證明該濾波器具有低漂移特性。(2)在無漂移有源低通濾波器的基礎(chǔ)上提出變參數(shù)濾波器,使濾波器的參數(shù)能隨時間發(fā)生變化,從而使響應速度得到較大的提高。仿真結(jié)果表明,本文所提出的方案是有效的快速濾波技術(shù),具有一定的工程應用價值。本文所用的仿真是借助Pspice和Multisi n仿真工具得出的。
[Abstract]:Filtering is an important concept in signal processing. Designing a filter with good performance becomes a key problem. A filter is a frequency-selecting device that allows the signal components of the frequency in the passband to pass through and attenuate other frequency components significantly. For a long time, in science and production activities, low pass filter is widely used in information acquisition and anti-jamming design in noise environment because of the low frequency weak signal carrying a large amount of basic information. It is an effective method to suppress noise, especially power frequency noise, by introducing low pass filter in DC channel. However, passive RC filter can only realize a class of special transfer functions with poles on negative real axis and single root, and can not meet the engineering requirements of diversity. Therefore, active RC low-pass filter is the most studied low-frequency filter system. However, when the active RC filter is introduced, the new additional drift generated by the active component will be introduced into the channel. In the fields of ocean monitoring, geological exploration and biomedicine, low frequency weak signal sensing, detection system and high precision instrument, the sensitivity of the system usually reaches the level of UV or even NV. The additional drift is a problem as serious as noise. In designing the filter, we hope that the filter has good frequency characteristics in the passband and high response speed. In many applications, the response speed of the filtering system is as important as the accuracy. However, the traditional filter implementation method can not satisfy this characteristic. The purpose of this paper is to establish the theory and implementation method of fast response active variable parameter low pass filtering system without channel additional drift in principle, which can be used as reference theory and technology for practical application. In the field of simulation, this paper presents an arbitrary order drift-free all-pole active low-pass filter. The principle of the circuit structure is analyzed and compared with the traditional low-pass filter by simulation. It is proved that the filter has the characteristic of low drift. (2) based on the no-drift active low-pass filter, a variable parameter filter is proposed, which makes the parameters of the filter change with time, and the response speed is greatly improved. The simulation results show that the proposed scheme is an effective fast filtering technique and has certain engineering application value. The simulation in this paper is obtained by Pspice and Multisi n simulation tools.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN713.4

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1 洪曉芳;任意階無漂移全極點有源低通濾波器[D];山東大學;2007年

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本文編號：1893287