https://iopscience.iop.org/article/10.1088/1361-6439/ac3465/pdf

Ultra-low power signal conditioning system for effective biopotential signal recording

A low power reconfigurable sensing amplifier for biomedical applications is proposed. Two cascode voltages in a telescopic amplifier are provided by using only one floating gate and a symmetrically cross self-biasing scheme. Complementary differential pairs and floating-gate techniques are employed to attain low electronic noise and bandwidth reconfigurability with low power consumption. To improve linearity in low frequency operation, gate-balanced pseudo resistors are adopted as feedback resistors. The power efficiency is optimised using a 1.8 V supply voltage with 30 nA current consumption in a 100 Hz bandwidth setting. The measured noise efficiency factor (NEF) is 1.88 with 2.81 μVrms integrated input-referred noise. The dynamic range is above 61.7 dB.

A power-efficient reconfigurable amplifier with crossed cascode self-biasing

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A power-efficient reconfigurable amplifier with crossed cascode self-biasing