Key result
Fully-differential CMOS preamplifier achieves ultra-low power dissipation of ~3 μW with high gain.
The designed CMOS preamplifier achieves low noise and power dissipation, making it suitable for non-invasive wearable ECG sensor applications.
May enable compact wearable ECG sensors; leaves open clinical validation.
In this paper, a noise and power-optimized fully-differential capacitive feedback CMOS preamplifier circuit is designed using a commercial 0.35 μ m CMOS technology node. The designed preamplifier circuit is part of an analog front-end SoC, which monitors the human electrocardiogram (ECG) using dry electrodes. The transistors in the interface circuit are biased in weak inversion region for lower total input referred noise and power dissipation respectively. With an input referred noise of 14.5 μ V RMS and 2.55 μ W power dissipation, the resultant preamplifier achieves a gain of 52dB over a bandwidth range of 0.003 Hz to 880 Hz with Noise Efficiency Factor (NEF) of 2.52.
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Gupta et al. (2023) studied Electrocardiogram (ECG) monitoring. CMOS preamplifier circuit was evaluated on Input referred noise and power dissipation. A fully-differential capacitive feedback CMOS preamplifier circuit achieved an input referred noise of 14.5 μV RMS and 2.55 μW power dissipation with a gain of 52dB.
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