镜像抑制的双调谐跟踪滤波器特性研究

本文是基于数字电视调谐芯片的前级系统设计,来讨论双调谐跟踪镜像抑制滤波器的设计.调谐器在电视接收系统中的作用其中包括选择并转换电视频道、滤除多种干扰.这种功能主要由前级系统来实现.双调谐滤波器不但有较好的频率选择特性,而且阻抗变换也方便.同时为了虑除镜像干扰,此带通滤波器还有镜像作用.本设计结合实际的工程,给出电路设计过程和电路的计算、仿真以及实际电路测试结果.通过本文,读者可以了解或者借鉴一下电路的设计思想.

The Characteristic Research of Double Tuning and Tracking Filter with Image Suppression

The article mainly discusses the design of a double-tuning and tracking filter with image suppression based on prestage system design of the DVB tuner. The functions of tuner in the TV receiver system include choosing and switching channels and filtering all kinds of interference, which can be achieved by prestage system. The double-tuning filter have not only good characteristic for choosing frequency, but also convenience for impedance matching. In order to filter interference, the hand-filter has the function of image suppression. The article presents the results of the calculation, the simulation analysis and the test of practical circuit. The reader may know or use for reference the thinking of the circuit design by reading this article.