Key result
The proposed noise-reconfigurable current-reuse resistive feedback amplifier achieved a noise level of 0.34µVrms while consuming 6.3µW power, saving up to 40% of total power consumption.
The proposed current-reuse resistive feedback amplifier improves power efficiency for fetal ECG monitoring while maintaining good noise efficiency and input impedance.
May enable lower-power fetal ECG monitoring; hypothesis-generating and requires clinical validation before practice change.
This paper presents a noise-reconfigurable resistive feedback amplifier with current-reuse technique for fetal ECG monitoring. The proposed amplifier allows for both tuning of the noise level and changing the power consumption according to the signal properties, minimizing the total power consumption while satisfying all application requirements. The amplifier together with its amplitude detector and dynamical biasing circuit is implemented in a standard 0.18-μm CMOS process. Measurements demonstrate that the proposed current-reuse resistive feedback topology improves the power efficiency of the conventional resistive feedback amplifier, achieving at the same time a good noise efficiency factor (NEF = 2.8) and an input impedance of 20 MQ. The amplitude detector and the dynamical biasing circuit, which tunes the current in the amplifier according to the signal amplitude, save up to 40% of the total power consumption. The amplifier achieves a measured noise level of 0.34 μVrmsin a 0.6-175-Hz band, consuming 6.3-μW power.
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Song et al. (2016) studied Fetal ECG monitoring. Noise reconfigurable current-reuse resistive feedback amplifier vs. Conventional resistive feedback amplifier was evaluated on Power consumption and noise level. The proposed noise-reconfigurable current-reuse resistive feedback amplifier achieved a noise level of 0.34µVrms while consuming 6.3µW power, saving up to 40% of total power consumption.
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