A low-power CMOS energy harvesting circuit for wearable sensors using piezoelectric transducers

摘要

In this paper, a low-power CMOS AC-to-DC full-bridge rectifier with a switch for piezoelectric transducers is presented. It consists of two NMOS and two PMOS transistors, which are configured to operate as a full-bridge rectifier along with an Op-Amp-based switch control circuit which is connected to a PMOS transistor of the main full-bridge rectifier. With a load of 45KΩ, the output rectifier voltage is 703mV and the input piezoelectric transducer voltage is 694mV. Simulated VOUT versus VIN conversion ratio is 98.7% with an efficiency of 46%. The circuit has been implemented in a standard 0.13µm CMOS process.