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

This paper proposes an ultra-low power active diode using a hysteresis common gate comparator for low-voltage and low-power energy harvesting systems. The proposed active diode 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. Simulation results demonstrated that the hysteresis comparator has a −27 and 25 mV hysteresis voltages and the active diode using the hysteresis comparator eliminates unwanted ripple voltage.