Transfer Function Preserving Transformations on Equal-Ripple RC Polyphase Filters for Reducing Design Efforts
Transfer Function Preserving Transformations on Equal-Ripple RC Polyphase Filters for Reducing Design Efforts
复制标题
保留等纹波 RC 多相滤波器上的传递函数变换以减少设计工作
DOI：
10.1093/ietfec/e90-a.2.333
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
H. Tanimoto
中科院分区：
文献类型：
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作者：
Hiroaki Tanabe;H. Tanimoto
等波纹RC多相滤波器的元件值扩展很大程度上取决于零点分配的顺序。为了找到最优设计，我们必须对所有可能的零分配进行穷举设计。本文介绍了两种电路变换的等纹波RC多相滤波器，保持其传递函数，以减少电路设计工作。建议的方法I将每个阶段的（R，C）值交换为（1/C，1/R）。这给出了一个新的电路，其原始电路的每一级具有不同的零点分配。方法II翻转原始电路，并将所得的（Ri，Ci）值交换为每个第i级的（Cn-1 +1，Rn-1 +1）。这些电路变换可以将电路设计的数量减少到直接方法的1/4。这大大减少了用于搜索最小元素值扩展条件的穷举设计的负担。给出了一些设计实例来说明所提出的方法。
Element value spread of an equal-ripple RC polyphase filter depends heavily on the order of zero assignment. To find the optimum design, we must conduct exhaustive design for all the possible zero assignments. This paper describes two circuit transformations on equal-ripple RC polyphase filters, which preserve their transfer functions, for reducing circuit design efforts. Proposed Method I exchanges (R, C) values to (1/C, 1/R) for each stage. This gives a new circuit with different zero assignment for each stage of its original circuit. Method II flips over the original circuit and exchanges the resulting (Ri, Ci) values for (Cn-i+1, Rn-i+1) for each i-th stage. Those circuit transformations can reduce a number of circuit designs down to 1/4 of the straight-forward method. This considerably reduces a burden for exhaustive design for searching the minimum element value spread condition. Some design examples are given to illustrate the proposed methods.