Key result
Tunable CMOS band-stop filter attenuates power-line noise by 102 dB at ultra-low power.
Why the study?
Designing portable electrocardiogram devices requires energy-saving filters capable of integrating onto chips and properly attenuating 50 Hz power-line noise.
The proposed band-stop filter design offers significant attenuation of 50 Hz power-line noise for ECG devices while maintaining extremely low power consumption suitable for portable battery-operated devices.
The electrocardiogram is affected by various noises and one of the most important of which is 50 Hz power-line noise. On the other hand, it is necessary to use a battery in the portable device and so it requires the use of low power consumption circuits. Therefore, one of the challenges ahead when designing this type of device is the use of energy-saving filters with the ability to integrate devices and attenuate unwanted signals properly. This paper presents a low-power tunable sixth-order band-stop filter that does not need the off-chip capacitors. The filter structure is based on operational transconductance amplifiers (OTA) and integrated capacitors. Also, it is possible to change the central attenuation frequency of the proposed filter using bias voltage of the transconductance amplifiers. The proposed band-stop filter is designed and simulated in 180 nm CMOS technology at the transistor level. The simulation results show that the proposed filter can attenuate unwanted signals at 50 Hz by 102 dB while the maximum capacitance used in the filter is 54 pF. The power consumption of the proposed band-stop filter is 13.1 nW at a supply voltage of 1.8 V.
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Solaymanpour et al. (2022) studied this question. Tunable low-power sixth-order band-stop filter was evaluated on Attenuation of unwanted signals at 50 Hz and power consumption. A proposed tunable sixth-order band-stop filter designed in 180 nm CMOS technology attenuated 50 Hz noise by 102 dB with a power consumption of 13.1 nW at 1.8 V.
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