A Low-Power Switched-Capacitor Humidity Sensor Interface

被引：0

作者：

Ye Shuqin ^{[1
]}

Chan, P. K. ^{[1
]}

机构：

[1] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore, Singapore

来源：

PROCEEDINGS OF THE 2010 IEEE ASIA PACIFIC CONFERENCE ON CIRCUIT AND SYSTEM (APCCAS) | 2010年

关键词：

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In this paper, a new switched-capacitor (SC) interface circuit for humidity sensor application is proposed. The sensing principle makes use of the difference between the thermal conductivity of air and water vapor at elevated temperatures. It causes a voltage difference between two isolated diodes. The reference diode is sealed and has a fixed thermal conductance, while the sensing diode is exposed to the environment having a humidity-dependent thermal conductance. The exposed diode is connected to the proposed SC circuit, which can be easily monolithically integrated using GlobalFoundries 0.18-mu m CMOS process. The simulation results show that the humidity sensitivity of the sensor is 6.84, 12.44, 22.51mV/%RH for 20 degrees C, 30 degrees C and 40 degrees C respectively. The key advantage is that the circuit operates across the full range of humidity levels for environment temperatures from 20 degrees C to 40 degrees C. The humidity sensing interface operates under a supply voltage of 3V and dissipates power as low as 400 mu W including the biasing circuits.

引用

页码：1039 / 1042

页数：4

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