An 11.8 nA ultra-low power active diode using a hysteresis common gate comparator for low-power energy harvesting systems

Abstract

This paper proposes an ultra-low power active diode (ADIO) using a hysteresis common gate comparator for low-voltage and low-power energy harvesting systems. The proposed ADIO consists of a MOS switch and hysteresis common gate comparator, which eliminates unwanted ripple and noise voltages. The hysteresis comparator controls the MOS switch to turn ON or OFF, depending on the input and output voltages. The hysteresis voltages of the comparator can be controlled by the current flowing in the comparator. The measurement results demonstrated that the hysteresis comparator had -26 and 25 mV hysteresis voltages and the ADIO using the hysteresis comparator eliminated unwanted ripple voltage. The maximum current consumption of our ADIO was 11.8 nA.