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Abstract
Eight universal integrator-based OTA-C filters for the realization of third-order transfer functions are presented. Four architectures are based on voltage-mode IFLF and LF OTA-C configurations and input distribution and output summation OTA networks. The other four are composed of current-mode FLF and LF OTA-C structures and input distribution and output summation OTA networks. Very simple design formulas are demonstrated. These filters can realize arbitrary transmission zeros, contain only grounded capacitors and have the minimum number of components. They are also insensitive to tolerances and non-idealities of OTAs and capacitors.