Demonstration of $155.1\ \mu\mathrm{W}$ Wake-Up Gas Sensor Node Toward 8 Month Lifetime

This paper reports the design and implementation of a wake-up gas sensor node, including both a low-power sensor and a wake-up electrical circuit that was particularly capable of utilizing the “on/off” characteristic of a previously reported nano-gap sensor to produce the needed output electrical power for alerting operations (e.g. LED lighting) under power budgets. The designed circuit, as predicted by a SPICE model, consumed 3.7mW of power for its “on” operation at an applied voltage of 1V, while only consuming ~970nW during its “off” operation. The measured power for both operations enabled an average power consumption of 155.1μW and depicted the wake-up functionality of the integrated gas sensor node for longterm battery-supported deployment. The integrated sensor node successfully demonstrated the lighting of an LED as an alarm signal, when exposed to a threshold concentration of 550 ppm of 1,5-diaminopentane gas.