A Sub 1μW Switched Source + Capacitor Architecture Free of Top/Bottom Plate Parasitic Switching Loss Achieving Peak Efficiency of 80.66 at a Regulated 1.8V Output in 180nm

摘要

This paper presents a 25nW-2.4μW switchedcapacitor based energy harvester. The proposed harvester avoids charging and discharging of top and bottom plate parasitic capacitors by switching both the terminals of energy source as opposed to switching just one terminal. As a result, the energy lost in switching the top and bottom plate parasitic capacitors is zero joules, which helps to achieve highly efficient switched capacitor architecture for harvesting sub 1μW energy. The proposed harvester achieves and efficiency of 80% while delivering 1μW output and achieves a peak efficiency of 80.66% at 2.4μW output. It occupies an area of 1.95mm2 in 180nm CMOS.