A 0.5-V 3.69-nW Complementary Source-Follower-C Based Low-Pass Filter for Wearable Biomedical Applications

Liu, Zexue; Tan, Yi; Li, Heyi; Jiang, Haoyun; Liu, Junhua; Liao, Huailin

doi:10.1109/tcsi.2020.2995351

Cited by 40 publications

(29 citation statements)

References 26 publications

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“…It is evident that for 3 rd -order BPF the device number of the proposed filter is 6-MI-OTAs whereas 8-OTAs are needed for [7]. The proposed filter also offers the best DR compared with BPF and LPF in [7], [38], [39]. Another advantage is the capability of fine-tuning of the lower, higher cut-off frequencies and the bandwidth of the filter.…”

Section: Simulation Resultsmentioning

confidence: 98%

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0.5-V High Linear and Wide Tunable OTA for Biomedical Applications

et al. 2021

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This paper presents a low-voltage nano-power multiple-input operational transconductance amplifier (MI-OTA) with high linearity performance and increased input voltage swing. The enhanced performances are achieved thanks to employing several techniques as the bulk-driven, source-degeneration, self-cascode and negative conductance along with the concept of the input signal attenuation formed by multiple-input MOS transistor. The MI-OTA is widely tunable that serves for biological signals processing. A 3 rd -order Butterworth band-pass filter (BPF) for electrocardiogram (ECG) signal processing with 55.8 dB dynamic rang is presented. The MI-OTA circuit is designed for 0.5V voltage supply and offers a 0.22% total harmonic distortion (THD) for 0.2V pp input signal with total power consumption of 13.4nW. Extensive simulation results including Monte Carlo analysis and process, voltage, temperature (PVT) corners using the 0.18µm CMOS technology from TSMC confirm the characteristics of the proposed MI-OTA and the filter.INDEX TERMS Operational transconductance amplifier (OTA), bulk-driven MOS transistor, multiple-input OTA, high-order filters.

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Section: Simulation Resultsmentioning

confidence: 98%

“…In Table 4 the filter performance is compared with the 3 rd -order BPF in [7], 5 th order LPF in [38] and 4 th order LPF based on flipped source follower (FSF) in [39]. It is evident that for 3 rd -order BPF the device number of the proposed filter is 6-MI-OTAs whereas 8-OTAs are needed for [7].…”

Section: Simulation Resultsmentioning

confidence: 99%

0.5-V High Linear and Wide Tunable OTA for Biomedical Applications

et al. 2021

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“…The dynamic range (DR=20×log(Vrmsmax/Vrms-noise)) for LPF and BPF for 1 % THD while rms noise was integrated over the filter bandwidth was calculated to be equal to 57.6 dB and 60.4 dB, respectively. Table III compares the proposed work with some previous related works [20,21,22,39,40,41], where the following figure of merit (FoM) [40], has been used for better comparison: ( ) ( )…”

Section: Simulation Resultsmentioning

confidence: 99%

“…It is evident that the proposed filters offer the best FOM, less number of active devices, the lowest voltage supply and the best low voltage capability from all others OTA-C based filters [20,22,39,40]. Compared with filters based on cascade of two stages of transistor-level biquad flipped voltage follower (FVF) [21] and flipped source follower (FSF) [41] the proposed filter still offers better dynamic range. Note that, the cascade biquad filters are pseudo differential structures that requires additional signal conditioning at the input.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…This work 2018 [20] 2019 [22] 2009 [39] 2007 [40] 2018 [21] 2020 [41] VDD[V] 0.5 0.5 The frequency characteristic of the proposed MIOTAbased 5 th -order LPF was verified by using Bode100 vector network analyzer (VNA) [37]. The cutoff frequency was regulated within 25-250Hz by regulating the bias currents (IB) in the range 50-500A as shown in Fig.…”

Section: Parametermentioning

confidence: 99%

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MIOTA-Based Filters for Noise and Motion Artifact Reductions in Biosignal Acquisition

2022

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This paragraph of the first footnote will contain support information, including sponsor and financial support acknowledgment. For example, "This work was supported in part by KMITL funding."ABSTRACTThis paper presents a new low-voltage CMOS structure for operational transconductance amplifier (OTA) exploiting the bulk-driven, the self-cascode and the multiple-input transistor techniques (MI). The multiple-input OTA (MIOTA) circuit operates in subthreshold region using 0.5V supply voltage and offers enhanced linearity. The MIOTA is developed for biopotential signal as well as electrocardiogram (ECG) signal processing circuit and it is exploited to design a 5th-order Chebyshev low-pass and 3rd-order band-pass filters with a dynamic range (DR) of 57.6 dB and 60.4 dB, and nanopower consumption of 50 nW and 60 nW, respectively. Due to the electronic tuning of cut-off frequency, the low-pass and band-pass filters are suitable for random noise and motion artifact noise reductions in biopotential signals. The circuits were designed in Cadence environment using the standard N-well 0.18 µm TSMC CMOS technology. Intensive post-layout simulation results along with the process, voltage, temperature analysis (PVT) and Monte Carlo (MC) prove the robustness of the design. The chip area of the proposed MIOTA is 0.00725 mm 2 (118µm×61.5 µm). Compared with standard OTA the MIOTA offers simplification of filter topology and reduced number of active elements. In order to demonstrate these advantages, the MIOTA-based filter was also build using commercially available OTA LT1228. The experimental results of OTA LT1228 confirm both the filter functionality and the advantages of the proposed MIOTA.INDEX TERMSBulk-driven, low-pass filter, band-pass filter, low power, low voltage, multiple input operational transconductance amplifier.

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Analysis of super‐source‐follower‐based GHz‐bandwidth biquadratic low‐pass filters

Chen,

Yen,

Lin

et al. 2024

Circuit Theory & Apps

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SummaryThe design of GHz‐bandwidth super‐source‐follower‐based low‐pass filters (SSF‐LPFs) is investigated. The transfer function is derived by considering transistor parasitics. The behaviors of SSF‐LPFs can be predicted accurately with these formulas. The theoretical values of pole/zero frequencies of the circuit agree well with the corresponding simulation results. Moreover, the relationship between the Q factor and the phase margin of the biquadratic filter is revealed. Two 1.3‐GHz 4th‐order LPFs are designed using 90‐nm CMOS technology, where one contains a high‐Q biquad with a small phase margin and a low‐Q biquad, while the other is built with two biquads with moderate Q factors and sufficient phase margins. For the former, the discrepancy between the theoretical and simulated phase margin is <2°, and the discrepancy between the theoretical and simulated corner frequency is <6%. For the latter, the discrepancy between the theoretical and simulated phase margin is <4°, and the discrepancy between the theoretical and simulated corner frequency is <4%. The filter containing biquads with sufficient phase margins is fabricated and occupies an area of 0.44 mm2. Consuming 14.4 mW, the filter delivers a bandwidth of 1.3 GHz, P1dB of −11.94 dBm, and IIP3 of −4.5 dBm.

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A 0.5-V 3.69-nW Complementary Source-Follower-C Based Low-Pass Filter for Wearable Biomedical Applications

Cited by 40 publications

References 26 publications

0.5-V High Linear and Wide Tunable OTA for Biomedical Applications

0.5-V High Linear and Wide Tunable OTA for Biomedical Applications

MIOTA-Based Filters for Noise and Motion Artifact Reductions in Biosignal Acquisition

Analysis of super‐source‐follower‐based GHz‐bandwidth biquadratic low‐pass filters

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