On the design of wave digital filters with low sensitivity properties

The wave digital filter patterned after doubly terminated maximum available power (MAP) networks by means of the Richard´s transformation has been shown to have low-coefficient-sensitivity properties. This paper examines the exact nature of the relationship between the wave-digital-filter structure and the MAP networks and how the sensitivity property arises, which permits implementation of the digital structure with a lower coefficient word length than that possible with the conventional structures. The proper design procedure is specified and the nature of the unique complementary outputs is discussed. Finally, an example is considered which illustrates the wave filter design, the conversion techniques, and the low sensitivity properties.