Title :
A low-noise integrated bioamplifier with active DC offset suppression
Author :
Zhao, Wei ; Li, Hongge ; Zhang, Youguang
Author_Institution :
Sch. of Electron. & Inf. Eng., Beihang Univ., Beijing, China
Abstract :
This paper describes a novel low-power, low-noise amplifier for neural recording applications. The bioamplifier achieves the best power-size tradeoff compared to the previous design. By means of a new active feedback configuration, the DC offset is rejected without the large capacitors. An active differentiator with an amplifier in the feedback path places a high-pass cutting frequency in the transfer function. The midband gain consists of the passive components, and is insensitive to the mismatch of process. The bioamplifier has been implemented in the Chartered 0.35-¿m 2P4M CMOS process and occupies 0.022 mm2 of chip area. The current consumption of amplifier is 2 ¿A at ±1.5 V supply. The bioamplifier achieves a midband gain of 46 dB and a -3 dB bandwidth from 13 Hz to 8.9 kHz. The input-referred noise is 5.7 ¿Vrms corresponding to an NEF of 3.1.
Keywords :
CMOS integrated circuits; amplifiers; bioelectric phenomena; biomedical electronics; biomedical measurement; feedback; integrated circuits; neurophysiology; 2P4M CMOS process; active DC offset suppression; active differentiator; active feedback configuration; current 2 muA; frequency 13 Hz to 8.9 kHz; gain 46 dB; high pass cutting frequency; low noise integrated bioamplifier; low power low noise amplifier; midband gain; neural recording applications; power-size tradeoff; size 0.022 mm; transfer function; voltage 1.5 V; Active noise reduction; Capacitors; Electrodes; Feedback; Filters; Frequency; Low-noise amplifiers; Neurofeedback; Power engineering and energy; Signal to noise ratio;
Conference_Titel :
Biomedical Circuits and Systems Conference, 2009. BioCAS 2009. IEEE
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-4917-0
Electronic_ISBN :
978-1-4244-4918-7
DOI :
10.1109/BIOCAS.2009.5372099
