Design and realization of continuous-time wave digital filters

D. Bruckmann
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引用次数: 8

Abstract

Digital signal processing in continuous-time can result in a number of advantages compared to classical sampled data systems, while the inherent advantages of digital implementations with respect to programmability and noise immunity are retained. It turned out however that a critical point of these systems is the implementation of the continuous- time delays, requiring a considerably larger chip area than the delays in sampled data systems. Thus structures with a minimum number of delay elements seem to be advantageous. In this contribution the implementation of continuous-time wave digital filters (WDFs) is considered. This filter type is well- known for its superior properties with respect to stability and sensitivity. Furthermore, by selecting a proper reference structure, WDFs can be implemented with a minimum number of delay elements for a given filter specification thus making them very attractive for continuous-time implementations. Due to the proposed concept a number of advantages are obtained and a very efficient realization in VLSI-technology becomes feasible.
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连续时间波数字滤波器的设计与实现
与经典的采样数据系统相比,连续时间的数字信号处理可以带来许多优势,同时保留了数字实现在可编程性和抗噪声方面的固有优势。然而,这些系统的一个关键点是实现连续时间延迟,这需要比采样数据系统中的延迟大得多的芯片面积。因此,具有最小延迟元件数量的结构似乎是有利的。在这个贡献中,考虑了连续时间波数字滤波器(WDFs)的实现。这种过滤器类型以其稳定性和灵敏度方面的优越性能而闻名。此外,通过选择适当的参考结构,对于给定的滤波器规范,wdf可以用最少数量的延迟元素来实现,从而使它们对连续时间实现非常有吸引力。由于提出的概念获得了许多优势,并且在vlsi技术上非常有效地实现是可行的。
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