UM E-Theses Collection (澳門大學電子學位論文庫)

check Full Text

Instrumentation amplifier and filter design for biopotential acquisition system

English Abstract

This work describes an instrumentation amplifier and a filter designed for biopotential readout front-end. For the biopotential readout front-end design, the challenges are common-mode interference from mains, inherent flicker noise of electrical circuit, electrode offset generated at the skin-electrode interface and amplitude and bandwidth characteristics of biopotential signals. To deal with these problems, a low noise low power current balancing instrumentation amplifier (CBIA) with high common mode rejection ratio is implemented as the core amplifier in this work. To further reduce the noise, chopping modulation technique is adopted to reduce the flicker noise. Furthermore, AC coupling technique introduced to filter the offset generated by the electrode. The instrumentation amplifier using these two kinds of technique is called AC coupling chopping modulated instrumentation amplifier (ACCIA). This work focuses on the implementation of ACCIA. Moreover, due to the amplitude and bandwidth characteristics of biopotential signals, this ACCIA is designed to have a configurable gain and filter characteristics. To further enhance the signal quality, a high-dynamic-range 2.4 Hz-to-10 kHz wide-range tunable 5th-order Butterworth lowpass filter is implemented in this work too. For capacitance savings with consequent silicon area reduction, a novel capacitor multiplier is proposed for the filter design.

Issue date



Chen, Chang Hao


Faculty of Science and Technology


Department of Electrical and Electronics Engineering




Biomedical engineering

Medical electronics

Signal detection

Portable computerized instruments


Vai, Mang I

Files In This Item

TOC & Abstract

Full-text (Intranet only)

1/F Zone C
Library URL