英文高手进.滤波器（filter）,是一种用来消除干扰杂讯的器件,将输入或输出经过过滤而得到纯净的直流电.对特定频率的频

英文高手进.
滤波器（filter）,是一种用来消除干扰杂讯的器件,将输入或输出经过过滤而得到纯净的直流电.对特定频率的频点或该频点以外的频率进行有效滤除的电路,就是滤波器,其功能就是得到一个特定频率或消除一个特定频率.
本文主要介绍Q值可调带通滤波器的分析与设计.Q值可调带通滤波器滤波器能够实现一般滤波器的让有用信号尽可能无衰减的通过,对无用信号尽可能大的衰减这一功能,还能够改变滤波器的Q值,从而实现对不同带宽的信号进行选择,增加了滤波器的灵活性.该滤波器由一个品质因数可调的双T型单元和一个差分级组成,通过设置双T型单元的参数可使其成为一个Q值可调带阻滤波器,差分之后实现Q值可调带通滤波.通过调节电阻的方法改变滤波器的Q值,同时不改变中心频率和最大增益.对设计电路进行仿真,通过波特图仪得到滤波器的幅频特性,不断调整参数,使得滤波器各参数达到所需值,实现Q值可调带通滤波器.
关键词：带通滤波器,Q值可调,双T型单元,差分级
感激不尽!
滤波器（filter直流电(direct current )频率(frequency)频点(frequency point)滤除(filtering)Q值(Q value)可调(tunable)带通滤波器(band-pass filter)无衰减(undamped) 带宽(bandwidth) 品质因数(quality factor )双T型单元(Double T type unit) 差分级(Poor graded)带阻滤波器(band stop filter)中心频率(mid-frequency)最大增益(maximum gain）仿真(simulation)波特图仪( Bode plotter )幅频特性(amplitude - frequency characteristics）

Filter is one kind of device for noise interference elimination during input and output to get clean direct current. Circuit for effective filtering of or off particular frequency point is called filter, which function is acquiring or eliminating one particular frequency. This article mainly introduces analysis and design of Q value tunable band-pass filter. Q value tunable band-pass filter is able to achieve the same function as common filter, that is useful signal undamped but useless signal extremely damped when signal is passing through. Besides, it is capable of changing Q value of filter to select signal of different bandwidth which increases filter’s flexibility. It is combined by one quality factor of tunable Double T Unit and Poor graded. By setting parameter of Double T Unit to make it to be Q value tunable band stop filter, after graded to get Q value tunable band-pass filtering. By regulation resistance to change Q value of filter, at the same time without changing mid-frequency and maximum gain. By circuit design simulation, bode plotter to get amplitude-frequency characteristics. With constant parameter regulation to gain the right parameters of filter, Q value tunable band-pass filter is achieved.
Key words: band-pass filter, Q value tunable, Double T Unit, poor graded