Title :
A 0.78mW/cm2 autonomous thermoelectric energy-harvester for biomedical sensors
Author :
Rozgic, Dejan ; Markovic, Dejan
Author_Institution :
Univ. of California, Los Angeles, Los Angeles, CA, USA
Abstract :
A thin-film array-based thermoelectric energy-harvester (TEH) is assembled in a 0.83cm2 footprint and attached to a power management unit integrated in 65nm CMOS. A single-inductor topology with analog maximum-power-point tracking leads to a 68% peak end-to-end efficiency and <;20ms tracking time. A 645μW regulated output power (effective 3.5K) is harvested in-vivo from a rat implanted with our TEH, to demonstrate true energy autonomy in real environment while achieving a 7.9x improvement in regulated power density. The autonomous operation is measured down to 65mV TEH input.
Keywords :
CMOS integrated circuits; biomedical electronics; energy harvesting; maximum power point trackers; thermoelectric devices; wireless sensor networks; CMOS; analog maximum-power-point tracking; autonomous thermoelectric energy-harvester; biomedical sensors; efficiency 68 percent; power 645 muW; power management unit; regulated power density; single-inductor topology; size 65 nm; thin-film array-based thermoelectric energy-harvester; voltage 65 mV; Charge pumps; Density measurement; Inductors; Logic gates; Pulse width modulation; Sensors; Voltage control;
Conference_Titel :
VLSI Circuits (VLSI Circuits), 2015 Symposium on
Conference_Location :
Kyoto
Print_ISBN :
978-4-86348-502-0
DOI :
10.1109/VLSIC.2015.7231289
