A self-powered multi-sensor fusion chip system for low-light photovoltaic power supply
In smart agriculture,wireless sensor network(WSN)can collect environmental data in real-time,significantly improving agricultural production efficiency.Most current WSN nodes rely on battery power,which not only increases energy costs but may also causes soil pollution.As a result,WSN system is rapidly evolving toward passive wireless sensing.Due to the small size of WSN nodes and limited energy harvesting capability,stringent power consumption control has become a critical issue.This paper designs a self-powered multi-sensor fusion system aimed at low-illumination photovoltaic energy harvesting.The system integrates an analog-assisted digital low-dropout(LDO)linear regulator,enabling it to provide stable voltage under low voltage conditions.It enhances the power supply rejection ratio(PSRR)using an offset module and feedforward technology,with bandwidth of 100 MHz in 0 dB to improve power noise suppression.The proposed multi-sensor chip can operate normally at a voltage of 0.6 V,and can be powered by a low-cost amorphous silicon photovoltaic cell under a low light intensity of 70 Lux.The power consumption is only 0.9 μW under a system clock frequency of 10 kHz.
ultra-low power circuitbattery-freewireless sensor networkmulti-sensor fusionPSRR enhancement
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