Abstract
This paper describes a micro power amplifier for neural signal recording. We describe an amplifier using a differential pair as input stage. Given that neural amplifiers must include differential input pair to achieve a high commonmode rejection ratio (CMRR). The amplifier has been designed in the AMS 0.35 mum, 3-metal, 2-poly, n-well standard CMOS process. Its current consumption is 4.61 muA at plusmn1V supply, which gives a power consumption of 9.22 muW. The CMRR is 113 dB and the power supply rejection ratio (PSRR > 73 dB). The input referred noise is 14.8 muVrms over 100 ~ 10 KHz. The amplifier gives an input DC offset of 196 muV and an output swing of plusmn0.8 V with minimum distortion.
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