ScholarWorks@성균관대학교

초록

Significant progress has been made toward fast, low‑power gas alarming, yet most existing systems stream sensor data to external processors and keep sensors continuously active, which inflates energy consumption and limits portability. In this work, we present a gas‑alarm platform that performs in‑sensor decision making by integrating a field‑effect transistor (FET) gas sensor with a low‑power embedded microheater and a dynamic latch comparator that leverages floating‑gate flash memory. This study employs design technology co-optimization (DTCO) by fusing the sensor with the memory circuit. To suppress excessive idle power (tens to hundreds of mW), the platform monitors at sub‑mW (∼600 µW) levels and activates the main gas sensing system only after confirming the presence of hazardous gas like NO2. Despite this ultra‑low‑power operation, the platform maintains high detection accuracy and rapid response (20ppb NO2, 25 s). Furthermore, the operating point is tunable. Higher power enables faster detection, and the programmable floating‑gate memory allows on-chip adjustment of the alarm threshold (from high-sensitivity mode to low-sensitivity mode). The binary output from the latch comparator simplifies interfacing with diverse host systems, facilitating integration with existing environmental and safety monitoring infrastructures.

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