The design of CMOS general-purpose analog front-end circuit with tunable gain and bandwidth for biopotential signal recording systems

Wei-Ming Chen; Wen-Chia Yang; Tzung-Yun Tsai; Herming Chiueh; Chung-Yu Wu

doi:10.1109/IEMBS.2011.6091185

The design of CMOS general-purpose analog front-end circuit with tunable gain and bandwidth for biopotential signal recording systems

Annu Int Conf IEEE Eng Med Biol Soc. 2011:2011:4784-7. doi: 10.1109/IEMBS.2011.6091185.

Authors

Wei-Ming Chen¹, Wen-Chia Yang, Tzung-Yun Tsai, Herming Chiueh, Chung-Yu Wu

Affiliation

¹ Department of Electronics Engineering and Institute of Electronics, National Chiao Tung University, Hsinchu, Taiwan.

PMID: 22255408
DOI: 10.1109/IEMBS.2011.6091185

Abstract

In this paper an 8-channel CMOS general-purpose analog front-end (AFE) circuit with tunable gain and bandwidth for biopotential signal recording systems is presented. The proposed AFE consists of eight chopper stabilized pre-amplifiers, an 8-to-1 analog multiplexer, and a programmable gain amplifier. It can be used to sense and amplify different kinds of biopotential signals, such as electrocorticogram (ECoG), electrocardiogram (ECG) and electromyogram (EMG). The AFE chip is designed and fabricated in 0.18-μm CMOS technology. The measured maximum gain of AFE is 60.8 dB. The low cutoff frequency can achieve as low as 0.8 Hz and high cutoff frequency can be adjusted from 200 Hz to 10 kHz to suit for different kinds of biopotential signals. The measured input-referred noise is 0.9 μV(rms), with the power consumption of 18μW per channel at 1.8-V power supply. And the noise efficiency factor (NEF) is only 1.3 for pre-amplifier.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Electrocardiography / methods
Electroencephalography / methods
Electromyography / methods
Signal Processing, Computer-Assisted*