集成滤波器优化设计新方法

针对集成滤波器设计中灵敏度高,波动大的问题,以LC梯形滤波器为设计原型,利用滤波器设计阶数上取整后带来的设计余量优化传递函数.通过对低通滤波器设计解析公式的优化,得到了滤波器设计的最佳解析公式.借助Bruton变换,可使模拟LC梯形滤波器转化成低灵敏度集成有源滤波器.仿真实验表明,利用该优化设计方法得到的集成滤波器,不仅具有LC梯形滤波器元件变化灵敏度低的优点,又在不增加滤波器阶数的情况下,改善了滤波器通带波动范围.

A New Method for Optimization Design of Integrated Filter

In case to high sensitivity and wild fluctuaion problems which appeared in the design procedure of integrated filter,the study takes LC ladder-type filter as design prototype and optimizes the transfer function by applying the design margin which is generated by rounding the filter order to the nearest integer.By optimizing the the analytical formula for the low-pass filter design,it could receive the best analytical formulas of filter design.By utilizing Bruton transformation,it could transfer analog LC ladder-type filter into low-sensitivity integrated active filter.Simulation results show that integrated filter which obtained by optimized design method not only has the advantage of low sensitivity as LC ladder-type filter,but also could improve the bandpass fluctuating range of filter without any increase in filter order number.