HIGH-FREQUENCY COMPENSATED CURRENT-MODE LADDER FILTERS USING MULTIPLE-OUTPUT OTAS

A methodology to implement compensated current-mode filters using mult iple output OTAs and based on RLC ladder filter prototypes is presente d. The resulting structures are very compact and share the low sensiti vity characteristics of the passive RLC prototypes. They can be realiz ed as CMOS circuits since they use only grounded capacitors and OTAs w ith one of the input terminals grounded. Compensation techniques to mi nimize degradation in the filter response due to excess phase of OTA p arasitic poles are discussed. Simulations with CMOS OTAs and experimen tal results from discrete circuit implementations using bipolar OTAs a re presented that verify the proposed approach.