Optimization of continuous time filters by delay line adjustment

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. A main difference to sampled data systems is the realization of the delay elements which are implemented as quasi-continuous time delay lines. In this paper it will be shown, that an additional degree of freedom is thus given, since the filter characteristic depends on the length of the delay lines. It will be shown, that an optimization of the filter characteristic can be performed by adjusting the delay lines. This will be demonstrated for filter structures well-suited for continuous time realization.