A 1V low-power CMOS resistance-to-frequency converter using hybrid transconductor for IoT

A low-voltage low-power CMOS bridge resistance-to-frequency converter (RFC) with high linearity for Internet of Things (IoT) applications is presented. It is based on a new single stage folded-cascode hybrid transconductor topology dedicated for RFC. The transconductor is a hybrid combination of a level-shift flipped voltage follower (LSFVF) and a folded shunt-feedback voltage follower (FSFVF) to form a complementary current push-pull output topology. The arrangement offers an effective drive to a resistive degeneration load whilst achieving low power and high linearity. Implemented in Globalfoundries 0.18 μm technology, the simulation results have shown that the proposed RFC only dissipates 22.5 μW at 1V supply, outperforming the representative reported works.