New low-sensitivity and low-noise GIC digital filter structures

Abstract

New digital filter structures based on the concept of generalized-immittance convertors (GICs) are proposed. These structures are shown to possess better sensitivity and noise properties than the already known GIC structures. A comparison study is carried out using different types of sensitivity and noise measures. Further, it is shown that the limit cycles under zero-input and forced response conditions can be eliminated in the proposed filters. With suitable modifications, these filters can be stabilized against constant-input limit cycles as well.De nouveaux types de filtres numeriques bases sur le concept de convertisseurs d'immittances generalises (CIG) sont presentes. On montre que ces structures possedent une meilleur sensibilite et des proprietes d'immunite aux bruits superieures aux structures CIG existantes. On y effectue une etude comparative a l'aide de diverses mesures de sensibilite et de bruit. On montre egalement que ces filtres eliminent les cycles limites consecutifs a une entree nulle et les conditions dues aux reponses forcees. Avec les modifications appropriees, ces filtres peuvent etre stabilises par rapport aux cycles limites dus a une entree constante. T< ADAPTOR 1 1 ADAPTOR J