A low mismatch sensitivity fully-balanced current-mode integrator

An improved fully-balanced current-mode integrator structure is presented. The proposed structure improves the low frequency CMRR of integrators reported in the literature from the order of g/sub m//g/sub o/ to g/sub m//sup 2//g/sub o//sup 2/. Moreover, the new structure provides more flexibility to guarantee stability and is less sensitive to process mismatch. Several integrator topologies are compared. The differential and common-mode gains and the CMRR at low and high frequencies are analyzed.