本文選題：低通濾波器 + 帶寬可調�。� 參考：《山東大學》2017年碩士論文

【摘要】：濾波技術是信號處理中不可或缺的部分,設計具有優(yōu)良性能的濾波器是一個關鍵問題。在實際生產生活中,大量的有用信息都承載于微弱的低頻信號,低通濾波器的重要意義在于能夠從噪聲信號中提取有用的低頻信號,因此低通濾波器的設計與發(fā)展至關重要。長期以來,人們致力于追求設計出具有易集成、低功耗、高精度等特性的濾波電路,并在測量、通信、儀器儀表等領域廣泛應用。但在很多動態(tài)信號處理和測量應用中,當系統輸入信號發(fā)生躍變時,邊沿信號會含有豐富的頻率成分,濾波器的輸出信號容易跟不上輸入信號的變化,人們希望設計的濾波器不僅能夠有效濾波而且有較快的響應速度。然而對于傳統的恒定參數的濾波器來講,由于其通帶恒定不變,很難同時滿足以上的兩項要求。在很多應用中,濾波系統的響應速度和精度同等重要,目前已經有一些快速濾波技術的理論與實現的研究�？焖贋V波技術具有廣泛的應用需求,同時對于創(chuàng)新已經相當成熟的濾波理論和技術有重要意義。本文的研究目的是設計一種帶寬可調的快響應時變模擬低通濾波器,解決恒定參數濾波器響應速度與有效除噪不能同時兼顧的問題,致力于實際應用提出可供參考的理論和技術。本文所做的主要工作包括:(1)在模擬領域,對一階、二階時變低通濾波器理論分析,提出了時變低通濾波器參數變化規(guī)律,并借助Matlab仿真進行了驗證。(2)設計出針對理想的連續(xù)單位階躍和混有噪音的階梯兩種輸入信號突變的檢測電路。(3)設計了一種基于JFET的壓控浮地線性可調的電阻電路。(4)在恒定參數低通濾波器的基礎上設計出帶寬階躍可調和連續(xù)可調的快響應時變低通濾波器,就輸入信號為理想的連續(xù)單位階躍信號和混有噪聲的階梯信號分別對帶寬可調時變低通濾波電路進行了實驗研究,驗證了能夠實現兼顧有效除噪和快速響應的效果。仿真結果表明,本文所提出快速濾波技術方案是有效的,具有一定的工程應用價值。
[Abstract]:Filter technology is an indispensable part of signal processing, and the design of filter with excellent performance is a key problem. In practice, a lot of useful information is carried on weak low frequency signal. The significance of low pass filter is to extract useful low frequency signal from noise signal, so the design and development of low pass filter is very important. For a long time, people have been pursuing to design filter circuits with the characteristics of easy integration, low power consumption and high precision, and have been widely used in the fields of measurement, communication, instruments and instruments. However, in many applications of dynamic signal processing and measurement, when the input signal of the system jumps, the edge signal will contain rich frequency components, and the output signal of the filter will easily fail to keep up with the change of the input signal. It is hoped that the designed filter not only can filter effectively but also has a fast response speed. However, for the traditional constant parameter filter, it is difficult to satisfy the above two requirements because the passband is constant. In many applications, the response speed and precision of the filter system are equally important, and there have been some research on the theory and implementation of the fast filtering technology. Fast filtering technology has a wide range of applications and has important significance for the innovation of filtering theory and technology. The purpose of this paper is to design a fast response time-varying analog low-pass filter with adjustable bandwidth to solve the problem that the response speed and effective denoising of the constant parameter filter can not be taken into account at the same time. It is committed to the practical application of the theory and technology for reference. The main work in this paper includes: (1) in the field of simulation, the first and second order time-varying low-pass filters are theoretically analyzed, and the variation law of parameters of time-varying low-pass filters is proposed. The detection circuit for the mutation of two kinds of input signals with ideal continuous unit step and mixed noise is designed with the aid of Matlab simulation. A kind of voltage controlled floating-ground linear adjustable resistor circuit based on JFET is designed. Based on the constant parameter low pass filter, a bandwidth step harmonic and continuous tunable low pass filter with fast response is designed. In this paper, the continuous unit step signal with ideal input signal and the step signal with mixed noise are experimentally studied on the time-varying low-pass filter circuit with adjustable bandwidth, and the results show that both effective de-noising and fast response can be realized. The simulation results show that the proposed fast filtering scheme is effective and has certain engineering application value.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN713.4

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