800 nW 43 nV/[radical]Hz neural recording amplifier with enhanced noise efficiency factor
Goh, Wang Ling
Date of Issue2012
School of Electrical and Electronic Engineering
Advances in neuroscience research and clinical applications have increasingly called for the low-power low-noise simultaneous recording of neural signals from a large number of electrodes. The neural interface IC is one of the essential blocks to capture the weak neural signals. Presented is an energy-efficient low-noise neural recording amplifier with enhanced noise efficiency factor (NEF) for neural recording systems. Based on the conventional capacitive feedback and pseudo-resistor structure, the fully differential neural amplifier employs the current-reuse technique to achieve low noise and high current efficiency, consuming 800 nA at 1 V power supply. The measured thermal noise floor is 43nV/ p Hz and the input-referred noise is 5.71 mVrms when integrated from 1 Hz to 50 kHz, leading to an NEF of 2.59. The entire neural amplifier has been fabricated using a 0.18 mm CMOS technology, occupying an area of 0.05 mm2.
DRNTU::Engineering::Electrical and electronic engineering