2-TYPE-INTERLACED STRUCTURE AND LBR TEST FOR LOW-SENSITIVITY DIGITAL-FILTER REALIZATION

In this brief, we present a new digital filter structure which shows a low-sensitivity property. It is a cascade structure consisting of Typ e 1 and Type 2 LBR two-pairs interlacing each other, and is called a t wo-type-interlaced (TTI) structure. In addition, a test procedure call ed an LBR test is introduced as a means to determine the LBR-ness of t he quantized TTI structure by checking the LBR ness of the residual Ty pe 1 two-pair in the associated Type 3 re-assembled structure. Compute r simulation confirms that this new structure exhibits a much improved sensitivity characteristic over the other existing structures.