Vol. 120, Issue 9, September 2010, pp.1-12

Design of a Modular Signal Conditioning Circuit for Biopotential Sensors

Winncy Y. DU, Winston JOSE, Jake ASKELAND

Mechanical & Aerospace Engineering Department

San Jose State University, San Jose, California 95116, USA

Tel.: +1-408-924-3866, fax: +1-408-924-3995

E-mail: winncy.du@sjsu.edu

Received: 5 August 2010   /Accepted: 14 September 2010   /Published: 27 September 2010

Abstract: Biosignal conditioning (BC) is critical in biomedical instruments because it directly affects measurement accuracy, reliability, and repeatability. BC also presents a great challenge due to the small amplitude of biosignals and their ease of corruption with noise and other disturbances. This paper describes a modular BC system developed for biopotential sensors that can preserve useful information while removing unwanted noise and interference components. This BC circuit includes an instrumentation amplifier, an active 1st-order high-pass filter with Sallen-Key configuration, a 5^th-order low-pass Bessel filter, and a 2^nd-order Twin-T notch filter. The order of these filters and the associated components in each filter can be easily changed to adapt to different biosignals (modular feature). Data acquisition and sampling were performed using a USB6009 module with a built-in A/D converter. Testing of a real electrocardiogram on the designed signal conditioning circuit demonstrated comparable outputs to commercial devices.

Keywords: Biosignal conditioning, Modular circuit, ECG signal.

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