| Paper Name |
RF Energy Harvesting Chip Powered Sensor Node |
| Published in |
Electronics, Circuits and Systems (ICECS), 2016 IEEE International Conference |
| Authors |
Younus Syed; Bharat G. Hegde; T. V. Prabhakar; M. Manjunath; K. J. Vinoy |
| Paper Overview |
The development of battery-less wireless sensor mote powered by an RFID reader, which can communicate the sensor data to multiple BLE enabled devices at a single instant.
- Integrating the RF Energy Harvesting circuits (RF-DC and DC-DC Converters) onto a die area of size 0.75 mm sq.
- RFEH chip was able to harvest energy from input power levels -12 dBm.
- The system was successfully run at minimum RF power level of -8 dBm.
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| System Model |
(Fig. 1. System architecture)
(Fig. 2. Block Diagram of Chip)
(Fig. 3. RF to DC Converter Implemented on Chip)
(Fig. 4. A Stage of Implemented DC-DC Converter)
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| Design aspects of the RFEH chip |
- RF-DC Converter : utilize the Square-law V-I characteristics of MOS transistor, they substituted MOS for Schottky in practice.
- Switched Capacitor DC-DC Converter : Two types of clocks are to be generated, one overlapping set to drive NMOS devices and a non-overlapping set to drive PMOS devices, this is to reduce reversion losses. Five such stages were cascaded, to boost the minimum output voltage of RF-DC.
- Voltage Limiter : Employing a feedback circuit around DC-DC, to control the output voltage.
- Power on Reset : Generates a reset signal, it can be used to enable an LDO or give an interrupt to a micro-controller.
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