A novel technique for designing continuous-time filters in MOS technology

A circuit design technique for continuous-time all-MOS integrated filters makes use of novel MOSFET-C building blocks which use MOS transistors as voltage-controlled resistors and achieve complete cancellation of MOS nonlinearities without requiring fully balanced signals. The resulting filter structures possess low sensitivity to MOSFET mismatches and hence low total harmonic distortion. The technique demonstrates the possibility of developing MOSFET-C integrated filters exclusively in the ´MOS-domain´ without having to obtain topologically the MOS filter structure from a known active-RC prototype circuit.<>