A 25 mV-startup cold start system with on-chip magnetics for thermal energy harvesting
Author(s)Garcha, Preetinder Kaur; El-Damak, Dina; Desai, Nachiket; Troncoso, Jorge; Mazotti, Erika; Mullenix, Joyce; Tang, Shaoping; Trombley, Django; Bluss, Dennis; Lang, Jeffrey H; Chandrakasan, Anantha P; ... Show more Show less
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Thermal energy harvesting systems use boost converters for high-efficiency low voltage operation, but lack the ability for low voltage startup without off-chip transformers. We present a cold start system that uses integrated magnetics instead of external transformers in a Meissner Oscillator to start up from ultra low voltages, with a switched capacitor DC-DC circuit for additional voltage gain. The oscillator analysis with on-chip magnetics allows device co-optimization for low voltage operation, despite 1000x lower inductance values than off-chip transformers. Co-optimized on-chip transformer and depletion-mode NMOS start up from 25 mV driven directly by a sourcemeter, or 50 mV with a 4.7 Ω series resistance, for the lowest integrated electrical startup. The co-packaged system provides proof of concept for integration with boost converter circuits on a single die to have a fully-integrated low voltage startup solution for thermal energy harvesting applications, without using off-chip transformers.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
43rd IEEE European Solid State Circuits Conference
Garcha, Preet, et al. "A 25 mV-startup cold start system with on-chip magnetics for thermal energy harvesting." 43rd IEEE European Solid State Circuits Conference, September 2017, Leuven, Belgium, IEEE
Author's final manuscript