Sensors & Transducers Journal

    (ISSN 1726- 5479)

Vol. 84, Issue 10, October 2007, pp.1625-1632

A Low-Power Signal Processing Unit for in vivo Monitoring and Transmission of Sensor Signals

M. R. HAIDER, S. K. ISLAM and M. ZHANG

Department of Electrical and Computer Engineering

The University of Tennessee, Knoxville, TN 37996-2100, USA

E-mail: mhaider@utk.edu, sislam@utk.edu

Received: 29 September 2007   /Accepted: 23 October 2007   /Published: 30 October 2007

Abstract: A low-power signal processing and telemetry circuit for any generic biosensor applications has been presented. The complete system manifests a potentiostat, a signal processing block and a modulator block. The on-chip potentiostat biases the sensor electrodes for proper extraction of the sensor signals. The signal processing block integrates and buffers the sensor signal to make it a data signal and finally a simple modulator block converts this data signal to an on-off-keying (OOK) signal with a high frequency carrier. Package pin of the fabricated circuit is used as an antenna and measurement results demonstrate the successful signal transmission from the chip within a few cm ranges. The entire system has been realized using 0.35 μm CMOS technology that consumes only 400 μW of power and occupies an area of 0.66 mm². Test results show that this scheme is an effective candidate for low-power sensor applications.

Keywords: Implantable, OOK signal, Low-power device, Transmitter

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