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Article: An Area-Efficient and Highly Linear Reconfigurable Continuous-Time Filter for Biomedical Sensor Applications
Title | An Area-Efficient and Highly Linear Reconfigurable Continuous-Time Filter for Biomedical Sensor Applications |
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Authors | |
Keywords | reconfigurable filter continuous-time low frequency low-pass filter (LPF) notch filter (NF) |
Issue Date | 2020 |
Publisher | Molecular Diversity Preservation International. The Journal's web site is located at http://www.mdpi.net/sensors |
Citation | Sensors, 2020, v. 20 n. 7, p. article no. 2065 How to Cite? |
Abstract | This paper proposes a compact, high-linearity, and reconfigurable continuous-time filter with a wide frequency-tuning capability for biopotential conditioning. It uses an active filter topology and a new operational-transconductance-amplifier (OTA)-based current-steering (CS) integrator. Consequently, a large time constant τ , good linearity, and linear bandwidth tuning could be achieved in the presented filter with a small silicon area. The proposed filter has a reconfigurable structure that can be operated as a low-pass filter (LPF) or a notch filter (NF) for different purposes. Based on the novel topology, the filter can be readily implemented monolithically and a prototype circuit was fabricated in the 0.18 μm standard complementary-metal–oxide–semiconductor (CMOS) process. It occupied a small area of 0.068 mm2 and consumed 25 μW from a 1.8 V supply. Measurement results show that the cutoff frequency of the LPF could be linearly tuned from 0.05 Hz to 300 Hz and the total-harmonic-distortion (THD) was less than −76 dB for a 2 Hz, 200 mVpp sine input. The input-referred noises were 5.5 μVrms and 6.4 μVrms for the LPF and NF, respectively. A comparison with conventional designs reveals that the proposed design achieved the lowest harmonic distortion and smallest on-chip capacitor. Moreover, its ultra-low cutoff frequency and relatively linear frequency tuning capability make it an attractive solution as an analog front-end for biopotential acquisitions. |
Persistent Identifier | http://hdl.handle.net/10722/294068 |
ISSN | 2023 Impact Factor: 3.4 2023 SCImago Journal Rankings: 0.786 |
PubMed Central ID | |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Zhang, J | - |
dc.contributor.author | Chan, SC | - |
dc.contributor.author | Li, H | - |
dc.contributor.author | Zhang, N | - |
dc.contributor.author | Wang, L | - |
dc.date.accessioned | 2020-11-23T08:25:52Z | - |
dc.date.available | 2020-11-23T08:25:52Z | - |
dc.date.issued | 2020 | - |
dc.identifier.citation | Sensors, 2020, v. 20 n. 7, p. article no. 2065 | - |
dc.identifier.issn | 1424-8220 | - |
dc.identifier.uri | http://hdl.handle.net/10722/294068 | - |
dc.description.abstract | This paper proposes a compact, high-linearity, and reconfigurable continuous-time filter with a wide frequency-tuning capability for biopotential conditioning. It uses an active filter topology and a new operational-transconductance-amplifier (OTA)-based current-steering (CS) integrator. Consequently, a large time constant τ , good linearity, and linear bandwidth tuning could be achieved in the presented filter with a small silicon area. The proposed filter has a reconfigurable structure that can be operated as a low-pass filter (LPF) or a notch filter (NF) for different purposes. Based on the novel topology, the filter can be readily implemented monolithically and a prototype circuit was fabricated in the 0.18 μm standard complementary-metal–oxide–semiconductor (CMOS) process. It occupied a small area of 0.068 mm2 and consumed 25 μW from a 1.8 V supply. Measurement results show that the cutoff frequency of the LPF could be linearly tuned from 0.05 Hz to 300 Hz and the total-harmonic-distortion (THD) was less than −76 dB for a 2 Hz, 200 mVpp sine input. The input-referred noises were 5.5 μVrms and 6.4 μVrms for the LPF and NF, respectively. A comparison with conventional designs reveals that the proposed design achieved the lowest harmonic distortion and smallest on-chip capacitor. Moreover, its ultra-low cutoff frequency and relatively linear frequency tuning capability make it an attractive solution as an analog front-end for biopotential acquisitions. | - |
dc.language | eng | - |
dc.publisher | Molecular Diversity Preservation International. The Journal's web site is located at http://www.mdpi.net/sensors | - |
dc.relation.ispartof | Sensors | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.subject | reconfigurable filter | - |
dc.subject | continuous-time | - |
dc.subject | low frequency | - |
dc.subject | low-pass filter (LPF) | - |
dc.subject | notch filter (NF) | - |
dc.title | An Area-Efficient and Highly Linear Reconfigurable Continuous-Time Filter for Biomedical Sensor Applications | - |
dc.type | Article | - |
dc.identifier.email | Chan, SC: scchan@eee.hku.hk | - |
dc.identifier.authority | Chan, SC=rp00094 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.3390/s20072065 | - |
dc.identifier.pmid | 32272594 | - |
dc.identifier.pmcid | PMC7180815 | - |
dc.identifier.scopus | eid_2-s2.0-85083260802 | - |
dc.identifier.hkuros | 319274 | - |
dc.identifier.volume | 20 | - |
dc.identifier.issue | 7 | - |
dc.identifier.spage | article no. 2065 | - |
dc.identifier.epage | article no. 2065 | - |
dc.identifier.isi | WOS:000537110500261 | - |
dc.publisher.place | Switzerland | - |