自跟踪对数域滤波器的研究

发布时间：2018-06-05 03:06

本文选题：自跟踪滤波器 + 宽频带频率-电流转换电路　；参考：《西北师范大学》2016年硕士论文

【摘要】：自跟踪滤波器可有效滤除信号传输过程中的各种干扰相噪声,当载波或基波变化时,电路的特征频率能自动跟踪,因而具有高的Q值和信噪比,在电子通讯及测量领域有重要的应用价值。本文针对目前自跟踪滤波器在信号处理时工作频率低、动态调谐范围不宽、功耗大等问题,提出一种模拟自跟踪滤波器的实现方案,将频率自跟踪电路和对数域滤波器融合到一起,研究出滤波频率能够快速跟踪输入信号频率变化的模拟滤波系统。着重研究解决的问题有:探究基于电流模处理技术的有源滤波器的设计方法,借鉴电流模式电路动态范围大、工作速度高等优点,设计了集对数域积分器、对数压缩和指数扩展“三电路一体”的对数域滤波器;研究了利用AD650和OP37构成的高性能宽频带频率-电流转换(F/I)电路,打破了现有频率-电流转换电路频带范围窄、处理速度不高的瓶颈,进而实现了高频信号的自跟踪滤波。本文的主要工作归纳为以下几点:(1)参阅国内外学术文献,阐述了自跟踪滤波器的发展趋势、应用领域及研究近况,总结比对了目前实现模拟自跟踪滤波器的方法;探究一种利用AD650和OP37构成的高性能宽频带频率-电流转换(F/I)电路,同时结合对数域滤波器,提出了一种新的自跟踪滤波器的设计方法。(2)详细介绍了电流模式电路的概念及特点,介绍了电流镜电路的工作原理;深入学习了对数域滤波器的基本原理、子模块单元及其优势特点。(3)设计信号预处理放大电路、V/I电路,研究以双向限幅电路、整形电路和宽频带频率-电流转换电路为组成元素的频率自跟踪电路,以实现滤波频率对输入信号频率的自动跟踪。针对设计的部分电路用ORCAD软件做了仿真分析和硬件电路实际测量。(4)利用三极管及少量电阻、电容元件设计对数域滤波器,并对设计的各种对数域滤波电路进行了理论分析及ORCAD软件的仿真验证,针对其中一部分电路焊接了硬件电路并测试了实验数据。本文提出的自跟踪对数域滤波器,其滤波频率可以跟踪输入信号频率的变化而自动更新和动态调节。它具有滤波频率范围宽、电路结构简单、调谐方便等优点,可以普遍应用于数据处理的各个领域,突破了待处理信号频率变化范围较大的障碍。
[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.
【学位授予单位】：西北师范大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN713

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