Monolithic integrated solar energy harvesting system

This paper presents a monolithic integrated solar energy harvesting circuit. Solar energy is harvested by CMOS Photodiodes fabricated on the same die as the power management circuits. The complete system includes a maximum power point tracking scheme, the use of a charge pump to increase the harvested voltage and regulation for load and power supply changes. Low power operation of the circuits is achieved through the use of sub-threshold and floating-gate design techniques. Simulated results using a photodiode model as the power supply show the feasibility of the proposed system.