Title :
A 0.5µVrms 12µW patch type fabric sensor for wearable body sensor network
Author :
Yan, Long ; Yoo, Jerald ; Kim, Binhee ; Yoo, Hoi Jun
Author_Institution :
Sch. of EECS, KAIST, Daejeon, South Korea
Abstract :
A 0.5 μVrms, 12 μW wirelessly powered patch type fabric sensor is presented for wearable body sensor network to continuously monitor personal bioelectric signals. Thick film electrodes are screen printed on the fabric with various metal components and their impedances of ˜100 kΩ are characterized. A 2-stage nested chopped analog readout front end (AFE) is optimized for the fabric sensor with reduced electrode referred noise performance of 0.5 μVrms. A 10b folded SAR ADC reduces capacitive DAC (CDAC) size and relaxes the power budget of ADC driver by 94%. The proposed fabric sensor operates with system resolution of 9b and CMRR≫106 dB. The chip fabricated with 0.18μm CMOS technology, the fabric sensor stacked by screen printed inductor (diameter=3 cm and # turns=4) can measure the ECG and EMG signals with wirelessly transmitted power through inductive coupling.
Keywords :
CMOS integrated circuits; biomedical electrodes; biomedical electronics; body sensor networks; digital-analogue conversion; electrocardiography; electromyography; patient monitoring; CMOS technology; ECG; EMG; SAR ADC; analog readout front end; capacitive DAC size; inductive coupling; patch type fabric sensor; patient monitoring; personal bioelectric signals; thick film electrodes; wearable body sensor network; wireless transmission; Bioelectric phenomena; Biomedical monitoring; Biosensors; Body sensor networks; CMOS technology; Electrodes; Fabrics; Sensor phenomena and characterization; Thick films; Wearable sensors;
Conference_Titel :
Solid-State Circuits Conference, 2009. A-SSCC 2009. IEEE Asian
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-4433-5
Electronic_ISBN :
978-1-4244-4434-2
DOI :
10.1109/ASSCC.2009.5357190
