Key result
A simulated 0.5 V fifth-order Butterworth low-pass filter for ECG applications achieved a bandwidth of 250 Hz, power consumption of 34.65 nW, and a dynamic range of 63.24 dB.
The proposed multiple-input OTA-based low-pass filter demonstrates ultra-low power consumption suitable for ECG acquisition systems.
This paper presents a 0.5 V fifth-order Butterworth low-pass filter based on multiple-input operational transconductance amplifiers (OTA). The filter is designed for electrocardiogram (ECG) acquisition systems and operates in the subthreshold region with nano-watt power consumption. The used multiple-input technique simplifies the overall structure of the OTA and reduces the number of active elements needed to realize the filter. The filter was designed and simulated in the Cadence environment using a 0.18 µm Complementary Metal Oxide Semiconductor (CMOS) process from Taiwan Semiconductor Manufacturing Company (TSMC). Simulation results show that the filter has a bandwidth of 250 Hz, a power consumption of 34.65 nW, a dynamic range of 63.24 dB, attaining a figure-of-merit of 0.0191 pJ. The corner (process, voltage, temperature: PVT) and Monte Carlo (MC) analyses are included to prove the robustness of the filter.
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Kumngern et al. (2020) studied Electrocardiogram (ECG) acquisition systems. 0.5 V fifth-order Butterworth low-pass filter based on multiple-input OTA was evaluated on Filter performance (bandwidth, power consumption, dynamic range). A simulated 0.5 V fifth-order Butterworth low-pass filter for ECG applications achieved a bandwidth of 250 Hz, power consumption of 34.65 nW, and a dynamic range of 63.24 dB.
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