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

Abstract

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.

Design of programmable Gaussian‐derived wavelet filter for wearable biomedical sensor

“…where Vim is the maximum input signal voltage, Vfloor is the noise floor, Virms and Vnoise represent the input root-mean-square and the input-referred noise voltage, respectively [3]. Also, the figure-of-merit (FoM) is defined as (25) [17], [25] FoM=…”

Authors' response

“…The main intention of our work in [1] was to design a low voltage, low power low‐pass filter for ECG signal front‐end processing. For this purpose, we proposed a bulk‐driven voltage follower (Figure 1(a) in [1]). We considered Ref [18] (cited in our paper and given below as [3]) by Sawigun et al, as the base paper.…”