Time Constant Enhancement Technique for Low-Frequency Filters

Rao, G. Hanumantha; Rekha, S.

doi:10.1007/s00034-019-01221-y

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2020

2022

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Cited by 3 publications

References 13 publications

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A 0.3‐V, 2.4‐nW, and 100‐Hz fourth‐order LPF for ECG signal processing

Rao

Sreenivasulu

Rekha

et al. 2020

Circuit Theory & Apps

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Summary An ultra‐low voltage, low power bulk‐driven voltage follower (VF) is proposed in this paper. Further, it is exploited to design a fourth‐order low‐pass filter (LPF) for electrocardiogram (ECG) signal processing. The filter is designed in UMC 180‐nm CMOS technology and operates with an ultra‐low supply voltage of 0.3 V. It consumes an extremely low power of 2.4 nW for a cutoff frequency of 100 Hz. Results of post‐layout simulation show that the proposed filter provides a dynamic range (DR) of 51.6 dB even from a 0.3‐V supply voltage. The filter achieves a Figure‐of‐merit (FoM) of 4.7 × 10−15, which is better than many designs listed in the literature.

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