High flat gain low noise neural signal recording amplifier

Abstract

The ultra low power and low noise neural amplifiers amplifies millihertz to kilohertz amplitude biosignals while rebuffing the direct current offsets has created a great demand amongst neuroscience researchers and clinicians. This paper presents a high flat gain neural amplifier design along with literature survey on the recent trends on neural amplifiers used for neuro recording applications. Various ultra low power techniques used to reject dc offsets and noise suppression are mainly focused as the part of the survey for designing nerve amplifiers. A 71dB flat gain nerve signal amplifier, almost few nV/sqrt(Hz) to 2.16μV/VHz noise and 385nW (FCM)–2.6pW (SCM) is designed and simulated using 90nm CMOS technology process. The capacitive — shorted gate-source pseudo resistive feedback technique is used in designing 1V powered neural amplifier. The CMRR is obtained as 76dB and PSRR is above 90dB.