Title :
A 1-V 1.1-μW sensor interface IC for wearable biomedical devices
Author :
Zou, Xiaodan ; Xu, Xiaoyuan ; Tan, Jun ; Yao, Libin ; Lian, Yong
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore
Abstract :
An ultra-low-power, low-noise sensor interface IC dedicated for bio-signal acquisition is presented in this paper. The proposed system architecture is optimized to achieve a better trade-off between power consumption and noise figure. A 0.05 ~ 200 Hz bandpass function is embedded within the front-end amplifier, and a wide bandwidth buffer is inserted between the front-end amplifier and ADC to facilitate a power-efficient interface. The system also includes an 11-bit SAR ADC with nonlinearity of less than plusmn0.7 LSB. The measured input-referred noise is 2.1 muV integrated across the pass-band, achieving noise efficiency factor of 2.9, and the power consumption for the overall system is 1.1 muW under 1 V supply.
Keywords :
CMOS integrated circuits; analogue-digital conversion; biomedical electronics; biomedical equipment; biomedical measurement; low noise amplifiers; low-power electronics; medical signal detection; sensors; signal processing equipment; ADC; CMOS process; SAR ADC; bandpass function; biosignal acquisition; frequency 0.05 Hz to 200 Hz; front-end amplifier; noise efficiency factor; noise figure; power 1.1 muW; power consumption; power-efficient interface; sensor interface IC; ultra-low-power low-noise sensor; voltage 1 V; wearable biomedical devices; wide bandwidth buffer; Bandwidth; Biomedical monitoring; Biosensors; Circuit noise; Clocks; Energy consumption; Low-noise amplifiers; Medical services; Noise figure; Wearable sensors;
Conference_Titel :
Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4244-1683-7
Electronic_ISBN :
978-1-4244-1684-4
DOI :
10.1109/ISCAS.2008.4542020
