Design of a micro power amplifier for neural signal recording

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 µm, 3-metal, 2-poly, n-well standard CMOS process. The amplifier current consumption is 4.61 µA at ±1V supply, which gives a power consumption of 9.22 µW. The CMRR is 113 dB and the power supply rejection ratio (PSRR ≫ 73dB). The input referred noise is 14.8 µVrms over 100 ∼ 10 KHz. The amplifier gives an input DC offset of 196 µV and an output swing of ±0.8 V with minimum distortion.

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