本文選題：自跟蹤濾波器 + 寬頻帶頻率-電流轉換電路　； 參考：《西北師范大學》2016年碩士論文

【摘要】：自跟蹤濾波器可有效濾除信號傳輸過程中的各種干擾相噪聲,當載波或基波變化時,電路的特征頻率能自動跟蹤,因而具有高的Q值和信噪比,在電子通訊及測量領域有重要的應用價值。本文針對目前自跟蹤濾波器在信號處理時工作頻率低、動態(tài)調(diào)諧范圍不寬、功耗大等問題,提出一種模擬自跟蹤濾波器的實現(xiàn)方案,將頻率自跟蹤電路和對數(shù)域濾波器融合到一起,研究出濾波頻率能夠快速跟蹤輸入信號頻率變化的模擬濾波系統(tǒng)。著重研究解決的問題有:探究基于電流模處理技術的有源濾波器的設計方法,借鑒電流模式電路動態(tài)范圍大、工作速度高等優(yōu)點,設計了集對數(shù)域積分器、對數(shù)壓縮和指數(shù)擴展“三電路一體”的對數(shù)域濾波器;研究了利用AD650和OP37構成的高性能寬頻帶頻率-電流轉換(F/I)電路,打破了現(xiàn)有頻率-電流轉換電路頻帶范圍窄、處理速度不高的瓶頸,進而實現(xiàn)了高頻信號的自跟蹤濾波。本文的主要工作歸納為以下幾點:(1)參閱國內(nèi)外學術文獻,闡述了自跟蹤濾波器的發(fā)展趨勢、應用領域及研究近況,總結比對了目前實現(xiàn)模擬自跟蹤濾波器的方法;探究一種利用AD650和OP37構成的高性能寬頻帶頻率-電流轉換(F/I)電路,同時結合對數(shù)域濾波器,提出了一種新的自跟蹤濾波器的設計方法。(2)詳細介紹了電流模式電路的概念及特點,介紹了電流鏡電路的工作原理;深入學習了對數(shù)域濾波器的基本原理、子模塊單元及其優(yōu)勢特點。(3)設計信號預處理放大電路、V/I電路,研究以雙向限幅電路、整形電路和寬頻帶頻率-電流轉換電路為組成元素的頻率自跟蹤電路,以實現(xiàn)濾波頻率對輸入信號頻率的自動跟蹤。針對設計的部分電路用ORCAD軟件做了仿真分析和硬件電路實際測量。(4)利用三極管及少量電阻、電容元件設計對數(shù)域濾波器,并對設計的各種對數(shù)域濾波電路進行了理論分析及ORCAD軟件的仿真驗證,針對其中一部分電路焊接了硬件電路并測試了實驗數(shù)據(jù)。本文提出的自跟蹤對數(shù)域濾波器,其濾波頻率可以跟蹤輸入信號頻率的變化而自動更新和動態(tài)調(diào)節(jié)。它具有濾波頻率范圍寬、電路結構簡單、調(diào)諧方便等優(yōu)點,可以普遍應用于數(shù)據(jù)處理的各個領域,突破了待處理信號頻率變化范圍較大的障礙。
[Abstract]:The self-tracking filter can effectively filter all kinds of interference phase noise in the process of signal transmission. When the carrier or fundamental wave changes, the characteristic frequency of the circuit can be automatically tracked, so it has high Q value and signal-to-noise ratio. It has important application value in the field of electronic communication and measurement. In this paper, a scheme of analog self-tracking filter is proposed to solve the problems of low operating frequency, not wide dynamic tuning range and large power consumption in signal processing. The frequency self-tracking circuit and logarithmic domain filter are fused together to develop an analog filtering system which can quickly track the change of input signal frequency. The main problems are as follows: exploring the design method of active power filter based on current mode processing technology, using the advantages of large dynamic range and high working speed of current-mode circuit, a set logarithmic domain integrator is designed. Logarithmic compression and exponential expansion "three circuits" logarithmic domain filters are studied. A high performance broadband frequency-current conversion F / I circuit is studied using AD650 and OP37, which breaks the narrow frequency band range of the current frequency-current conversion circuit. The bottleneck of low speed is processed, and the self-tracking filter of high frequency signal is realized. The main work of this paper is summarized as follows: 1) referring to the domestic and foreign academic literature, the development trend, application field and research status of the self-tracking filter are described, and the methods to realize the analog self-tracking filter are summarized and compared. This paper probes into a kind of high performance wide-band frequency-current conversion F / I circuit based on AD650 and OP37. At the same time, combining with logarithmic domain filter, a new design method of self-tracking filter is proposed. The concept and characteristics of current-mode circuit are introduced in detail. This paper introduces the working principle of current mirror circuit, deeply studies the basic principle of logarithmic domain filter, the submodule unit and its advantages, designs the signal preprocessing amplifier circuit and V / I circuit, and studies the bidirectional limiting circuit. The shaping circuit and the wide-band frequency-current conversion circuit are the components of the frequency self-tracking circuit to realize the automatic tracking of the input signal frequency by the filter frequency. For the designed part of the circuit, the simulation analysis is done by ORCAD software and the actual measurement of hardware circuit. 4) using transistor and a few resistors, capacitive elements are used to design log-domain filter. The designed logarithmic filter circuits are analyzed theoretically and verified by ORCAD software. The hardware circuits are welded and the experimental data are tested for some of the circuits. The self-tracking logarithmic domain filter proposed in this paper can automatically update and dynamically adjust the frequency of the input signal by tracking the frequency of the filter. It has the advantages of wide range of filter frequency, simple circuit structure and convenient tuning. It can be widely used in various fields of data processing, and breaks through the obstacle of large frequency variation range of signal to be processed.
【學位授予單位】：西北師范大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TN713

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