A global optimization procedure for SPUDT filters
A global optimization procedure for SPUDT filters
复制标题
SPUDT滤波器的全局优化过程
DOI：
10.1109/ultsym.1993.339711
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
S. Chamaly
中科院分区：
文献类型：
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作者：
P. Ventura;M. Solal;P. Dufilié;S. Chamaly
已发布的使用内部反射的单相单向 (SPUDT) 滤波器的设计方法仅允许对单个换能器进行优化：电声传递函数（幅度和相位）以及加载换能器的声反射。因此，通带纹波优化时不考虑换能器之间的多次反射。我们提出了一种直接优化整个滤波器的幅度和群延迟的通用方法。新方法考虑了换能器间的反射，同时控制每个换能器。此外，该新算法还考虑了换能器之间获得低馈通水平所需的光栅屏蔽的反射加权函数。使用这种新的全局优化程序，各种低损耗带通滤波器的滤波特性以及尺寸减小得到了显着改善：我们提出了使用这种算法设计的各种基于 SPUDT 的滤波器。用于移动 GSM 的 71 MHz 滤波器的尺寸大大减小，同时保留了两个 SPUDT 结构：该滤波器适合 SIP 5 封装，而之前的滤波器需要 DIP 14 封装
Published design methods of single phase unidirectional (SPUDT) filters using internal reflections only allow for individual transducer optimization:electroacoustic transfer function (amplitude and phase), and, acoustic reflection of the loaded transducer. Consequently, multiple reflections between transducers are not taken into account for passband ripple optimization. We present a generalized method which optimizes directly the amplitude and group delay of the entire filter. The new method takes into account inter-transducer reflections, while controlling simultaneously each transducer. Furthermore, the reflection weighting functions of grating shields needed between transducers to obtain low feed through level are also taken into account in this new algorithm. Filtering characteristics as well as size reduction of various low loss bandpass filters have been dramatically improved using this new global optimization procedure : we present various SPUDT based filters designed using this algorithm. The size of a 71 MHz filter for mobile GSM was greatly reduced while keeping a two SPUDT structure: this filter fits in a SIP 5 package while the previous filter required a DIP 14 package