Resistor-based high-linearity OTAs with rail-to-rail output operation

A new general topology for resistor-based operational transconductance amplifiers (OTAs) is proposed. As in the case of previously reported realizations based on differential pairs with resistive source degeneration, the proposed architecture employs a pair of linearization amplifiers. Various linearization amplifier implementations lead to different OTA configurations, some of them being previously reported in literature, with new circuits being derived as well.