一种链函数滤波器及其应用

An improved chain function filterand and its application

提出了一种滤波器传递函数——链函数滤波器,链函数能给出一系列在同样的阶数下,产生不同响应的传递函数.根据技术指标和元件特性,可选择所需要的滤波器.当给出回归损耗和带外抑制特性时,也可以设计这种滤波器.给出了链函数传递函数的表达式,分析了链函数滤波器的极点分布和群延迟特性.同传统的切比雪夫和巴特沃思函数相比,这种改进型的链函数滤波器表现出许多优点.

A kind of filter transfer function called chained-function filter was studied in this paper.The chain function yields a variety of transfer functions,having the same order,but different response.A filter can be selected according to the technology guideline and elements characteristic.And it can also be designed by maintaining a given return loss level and a predetermined out-of-band rejection performance.The transfer function and its poles expressions are given in detail and the group delay characteristics of the chain function filter was analyzed.As compared to the conventional filters,this improved family of chain function filter have many advantages.