Key result
The proposed multi-channel ECG analog front-end achieved a variable gain of 40.5-56dB and an average power consumption of 2.6µW per channel, with a power efficiency factor of 3.93.
The proposed low-noise and low-power multi-channel ECG AFE achieves significant reductions in power consumption and chip area, demonstrating potential for efficient ECG signal acquisition hardware.
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May enable lower-power multi-channel ECG systems; leaves open clinical validation before practice adoption.
This paper proposes a low-noise and low-power current-reuse analog front-end (AFE) for multi-channel electrocardiography (ECG) acquisition. A new low-power orthogonal recombination method is proposed in the four-channel current-reuse amplifier, which reduces the recombination current by half and cuts down the power supply voltage while ensuring the crosstalk suppression capability, resulting in a lower average channel power consumption. A four-order current-cancellation subthreshold-source-follower low-pass filter (CS-LPF) is proposed in this paper, which realizes the reduction of the chip area and power consumption by cross-coupling current cancellation technology. In addition, the input impedance boosting circuit, DC servo loop (DSL), and successive approximation register analog-to-digital converter (SAR-ADC) are designed in the proposed AFE, and it can record and quantify ECG signals. The presented AFE was implemented in a 65nm CMOS process, and the core area is 1.42mm× 0.85mm. The measured results show that the proposed AFE has a variable gain of 40.5-56dB. The fully differential low-pass filter with a power consumption of only 4.8nW achieves 50% capacitance reduction. The average power consumption per channel of the proposed AFE is only2.6μ W, and the power efficiency factor (PEF) and noise efficiency factor (NEF) are 3.93 and 1.81 respectively.
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Tian et al. (2023) studied this question. Low-noise and low-power current-reuse analog front-end (AFE) was evaluated on Power consumption and efficiency. The proposed multi-channel ECG analog front-end achieved a variable gain of 40.5-56dB and an average power consumption of 2.6µW per channel, with a power efficiency factor of 3.93.
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