Silicon and Germanium on Insulator and Advanced CMOS and MOSHFETsNo Access

LOW-POWER BIOMEDICAL SIGNAL MONITORING SYSTEM FOR IMPLANTABLE SENSOR APPLICATIONS

Department of Engineering Science, Sonoma State University, 1801 East Cotati Avenue, Rohnert Park, CA 94928, USA

Department of Electrical Engineering and Computer Science, The University of Tennessee, 1508 Middle Drive, Knoxville, TN 37996-2100, USA

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SALWA MOSTAFA

Department of Electrical Engineering and Computer Science, The University of Tennessee, 1508 Middle Drive, Knoxville, TN 37996-2100, USA

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, and

SYED KAMRUL ISLAM

Department of Electrical Engineering and Computer Science, The University of Tennessee, 1508 Middle Drive, Knoxville, TN 37996-2100, USA

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https://doi.org/10.1142/S0129156411006453Cited by:1 (Source: Crossref)

Abstract

Implantable biomedical sensors and continuous real time in vivo monitoring of various physiological parameters requires low-power sensor electronics and wireless telemetry for transmission of sensor data. In this article, generic blocks required for such systems have been demonstrated with design examples. Ideally neural or electro-chemical sensor signal monitoring units comprise of low noise amplifiers, current or voltage mode analog to digital domain data conversion circuits and wireless telemetry circuits. The low-noise amplifier described here has a novel open loop amplifier scheme used for neural signal recording systems. The design has been implemented using 0.5-μm SOI-BiCMOS process. The fabricated chip can work with 1 V supply and consumes 805 nA. The current mode analog to digital conversion signal processing circuitry takes the current signal as an input and generates a pulse-width modulated data signal. The data signal is then modulated with a high frequency carrier signal to generate FSK data for wireless transmission. The design is fabricated in 0.5-μm standard CMOS process and consumes 1.1 mW of power with 3.5 V supply.

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