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학술지 1.5 V Sub-mW CMOS Interface Circuit for Capacitive Sensor Applications in Ubiquitous Sensor Networks
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저자
이성식, 이아라, 제창한, 이명래, 황건, 최창억
발행일
200810
출처
ETRI Journal, v.30 no.5, pp.644-652
ISSN
1225-6463
출판사
한국전자통신연구원 (ETRI)
DOI
https://dx.doi.org/10.4218/etrij.08.1308.0034
협약과제
07MB2500, 유비쿼터스용 CMOS 기반 MEMS 복합센서기술개발, 최창억
초록
In this paper, a low-power CMOS interface circuit is designed and demonstrated for capacitive sensor applications, which is implemented using a standard 0.35-μm CMOS logic technology. To achieve low-power performance, the low-voltage capacitance-to-pulse-width converter based on a self-reset operation at a supply voltage of 1.5 V is designed and incorporated into a new interface circuit Moreover, the external pulse signal for the reset operation is made unnecessary by the employment of the self-reset operation. At a low supply voltage of 1.5 V, the new circuit requires a total power consumption of 0.47 mW with ultra-low power dissipation of 157 μW of the interface-circuit core. These results demonstrate that the new interface circuit with self-reset operation successfully reduces power consumption. In addition, a prototype wireless sensor-module with the proposed circuit is successfully implemented for practical applications. Consequently, the new CMOS interface circuit can be used for the sensor applications in ubiquitous sensor networks, where low-power performance is essential.
키워드
Capacitive MEMS sensor, Low-power CMOS interface circuit, Readout integrated circuit (ROIC), Ubiquitous sensor network (USN)
KSP 제안 키워드
CMOS logic, Capacitive MEMS, Capacitive sensor, Interface circuit, Low Supply Voltage, Low power dissipation, MEMS sensor, Readout integrated circuit, Reset operation, Total power consumption, Ultralow power(ULP)