A 50nV/√Hz 2-channel time multiplexed bio-chopper amplifier with current-attenuated feedback resistor

초록

This paper presents 2-channel time-multiplexed chopper instrument amplifier for better gain accuracy and mismatch. Mostly, the current-attenuated feedback resistor with a duty-cycled resistor is adopted for boosting the RC time constant. It can achieve the high pass corner frequencies between 10 Hz and 320 Hz by a 3-bit digitally controlled resistor bank of the attenuator. As a result, the instrument amplifier achieves 0.6% gain accuracy between two time-multiplexed channels, 100 dB CMRR, -40 dB crosstalk, and noise densities of 50nV/root Hz. It is implemented in a 180-nm CMOS technology. It occupies a 0.6 mm*0.6 mm chip area and consumes 1.5 mu A current consumption from a 1.8 V supply for each channel.

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