Sub-threshold startup charge pump using depletion MOSFET for a low-voltage harvesting application
- Resource Type
- Conference
- Authors
- Pillonnet, Gael; Martinez, Thomas
- Source
- 2015 IEEE Energy Conversion Congress and Exposition (ECCE) Energy Conversion Congress and Exposition (ECCE), 2015 IEEE. :3143-3147 Sep, 2015
- Subject
- Power, Energy and Industry Applications
Charge pumps
Topology
MOSFET
Threshold voltage
Energy harvesting
Logic gates
DC-DC converter
charge pump
low-voltage startup
depletion MOSFET
energy harvesting interface
thermo-energy generator
- Language
- ISSN
- 2329-3721
2329-3748
This paper presents a fully integrated CMOS start-up circuit for a low voltage battery-less harvesting application. The proposed topology is based on a step-up charge pump using depletion transistors instead of enhancement transistors. With this architecture, we can obtain a self-starting voltage below the enhancement transistor's threshold due to its normally-on operation. The key advantages are the CMOS compatibility, inductor-less solution and no extra post-fabrication processing. The topology has been simulated in 0.18μm technology using a transistor-level model and has been compared to the traditional charge pump structure. The depletion-based voltage doubler charge pump enables operation from an input voltage as low as 250mV compared to 400mV in an enhancement-based one. The proposed topology can also achieve other conversion ratios such as 1:-1 inverter or 1:N step-up.