A micropower neural recording amplifier with improved noise efficiency factor

Autor: Yusuf Leblebici, Alexandre Schmid, Vahid Majidzadeh
Rok vydání: 2009
Předmět:
Zdroj: ECCTD
DOI: 10.1109/ecctd.2009.5274982
Popis: This article presents a neural recording amplifier suitable for large-scale integration with multi-electrode arrays (MEAs) in very low-power microelectronic cortical implants. The proposed amplifier is the most energy-efficient structure reported to date, which achieves an effective noise efficiency factor (NEF) smaller than the theoretical limit that was claimed in literature for any existing amplifier (NEF=3D2.02). The proposed technique, which is referred to as partially OTA sharing technique, achieves a significant reduction of power dissipation as well as silicon area, in addition to the very low NEF. The effect of systematic mismatch on crosstalk between adjacent channels and the trade-off between noise and crosstalk are theoretically analyzed. For an array of four neural amplifiers, simulation results show a midband gain of 39.2 dB and a -3 dB bandwidth from 10 Hz to 10.6 kHz. The input referred noise is simulated to be 2.21 μV rms and the power consumption is 7.92 μW from 1.8 V supply, which refers to NEF=3D1.8. The worst-case crosstalk within the desired bandwidth is -46.1 dB.
Databáze: OpenAIRE
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