A fully reconfigurable low-noise biopotential sensing amplifier

Author

Tzu-Yun Wang ; Min-Rui Lai ; Twigg, Christopher M. ; Sheng-Yu Peng

Author_Institution

Nat. Taiwan Univ. of Sci. & Technol., Taipei, Taiwan

fYear

2013

fDate

Oct. 31 2013-Nov. 2 2013

Firstpage

234

Lastpage

237

Abstract

In this paper, we present a fully reconfigurable biopotential sensing amplifier, which employs floating-gate transistors for the programming of the low-frequency cutoff corner and for and for common-mode feedback implementation without consuming any extra power. With a supply voltage of 2.5V, the measured midband gain is 40.7dB and the measured input-referred noise is 2.8 μV_rms. The chip was tested under several configurations with the amplifier bandwidth being programmed to 100Hz, 1kHz, and 10 kHz. The measured noise efficiency factors in these bandwidth settings are 1.96, 2.01 and 2.25. The measured common-mode rejection and the supply rejection are above 70 dB. The measured dynamic range is 60 dB with total harmonic distortion less than 0.1%.

Keywords

biomedical electronics; biomedical equipment; biosensors; low noise amplifiers; transistors; amplifier bandwidth; common-mode feedback implementation; common-mode rejection; floating-gate transistors; frequency 1 kHz; frequency 10 kHz; frequency 100 Hz; gain 40.7 dB; input-referred noise; low-frequency cutoff corner programming; low-noise biopotential sensing amplifier; noise efficiency factors; total harmonic distortion; voltage 2.5 V; Bandwidth; Biomedical measurement; MOSFET; Noise; Noise measurement; Sensors;

fLanguage

English

Publisher

ieee

Conference_Titel

Biomedical Circuits and Systems Conference (BioCAS), 2013 IEEE

Conference_Location

Rotterdam

Type

conf

DOI

10.1109/BioCAS.2013.6679682

Filename

6679682