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A silicon neuron based biopotential amplifier for biomedical applications

In recent years various types of biosignals originating from the human body are being extensively used for diagnostics as well as therapeutic interventions. An implantable biopotential recording system could capture the detail information of the vital physiologic phenomena in the biosignal. A high performance biopotential amplifier as one of the critical components in the biopotential recording system requires power efficiency, high sensitivity, and suppression of the DC signal. In an attempt to reduce the power consumption, the system noise and the chip size, this paper presents a bio-inspired silicon neuron based low-frequency suppression biopotential amplifier. The amplifier is designed in 0.13 μm standard CMOS process and the total power consumption with 500 mV supply voltage is 4.4 μW. The gain is 34 dB with a -3 dB band of 11 Hz to 7.2 KHz. The input-referred noise is 6.7 μVrms integrated over the entire band.