Abstract-Integrated photovoltaic energy harvesting from indoor lighting is appropriate for ultra-low duty cycle applications. Indoor illumination may flicker due to AC mains rectification or pulse-width-modulated dimming, causing ripple on the output voltage. Switched-capacitor DC/DC conversion can increase harvester output voltage and reduce this ripple. We present a switched-capacitor boost converter design, a model that matches measured output voltage within 10% for 500 Hz to 5 MHz switching frequencies, and compare the converter to a series photodiode configuration. The distortion caused by supply ripple on a passive filter delta-sigma modulator is modeled and verified with measurements from a 180nm test chip.

in 2011, both in Electrical Engineering. He is currently pursuing a Ph.D. in Electrical & Computer Engineering at UC Davis. His research is in the area of low power mixedsignal integrated circuits for energy harvesting sensor applications. He is also interested in high-speed wireline communication circuits, high-performance VLSI designs, and signal integrity.