带通滤波电路的相频特性研究

A Study of the Phase as a Function of Frequency about Band-pass Filters

带通滤波电路一般用于通过特定频率域的信号通过,阻止该频率域以外的频率的信号通过。文章研究带通滤波电路的相频特性。描述相频特性的一条曲线,通常称为相频特性曲线,指出响应的相位随着输入频率变化而变换的情况。通过频域分析给出相频特性与品质因数的关系及带通滤波电路的相频特性曲线与电路的品质因数的关系。

Band-pass filters is generally designed to pass signals with a specific frequency range and reject or attenuate signals whose frequency spectrum is outside this pass-band.The phase as a function of frequency about band-pass filters is studied.A plot of this function,which is commonly called the phase characteristics,displays the manner in which the response varies with the input frequency.The frequency-domain analysis is performed to indicate that the dependence of phase on the quality factor Q.