{"title":"A 4.6-nW, 100-Hz, 63.88-dB DR, Second-Order Subthreshold Gm-C Filter for Portable Biomedical Applications","authors":"Cheng Huang, Yan Han, Qiang Cui","doi":"10.1049/ell2.70190","DOIUrl":null,"url":null,"abstract":"<p>This letter presents a subthreshold second-order transconductor–capacitor (<i>G<sub>m</sub></i>-<i>C</i>) low-pass filter (LPF) for portable biomedical applications. To broaden the range of linear signal processed by the filter, we modified the source–follower biquad and proposed an advanced <i>g<sub>m</sub></i> cell based on source-coupled pair (SCP). The implementation of self-cascode composite transistors (SC) in the <i>g<sub>m</sub></i> cell resulted in a notable enhancement of the filter's linearity and dynamic range (DR) while maintaining a low power consumption level. The circuit simulations using a 55-nm CMOS process verified that the proposed filter consumes 4.6 nW and contributes input-referred noise (IRN) of 104 µV<sub>rms</sub> at a cut-off frequency of 100 Hz. Furthermore, the LPF attains DR and figure of merit (FoM) values of 63.88 dB and 14.71 fJ, respectively, which is a potential candidate for biomedical applications.</p>","PeriodicalId":11556,"journal":{"name":"Electronics Letters","volume":"61 1","pages":""},"PeriodicalIF":0.7000,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/ell2.70190","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Electronics Letters","FirstCategoryId":"5","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1049/ell2.70190","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
This letter presents a subthreshold second-order transconductor–capacitor (Gm-C) low-pass filter (LPF) for portable biomedical applications. To broaden the range of linear signal processed by the filter, we modified the source–follower biquad and proposed an advanced gm cell based on source-coupled pair (SCP). The implementation of self-cascode composite transistors (SC) in the gm cell resulted in a notable enhancement of the filter's linearity and dynamic range (DR) while maintaining a low power consumption level. The circuit simulations using a 55-nm CMOS process verified that the proposed filter consumes 4.6 nW and contributes input-referred noise (IRN) of 104 µVrms at a cut-off frequency of 100 Hz. Furthermore, the LPF attains DR and figure of merit (FoM) values of 63.88 dB and 14.71 fJ, respectively, which is a potential candidate for biomedical applications.
期刊介绍：
Electronics Letters is an internationally renowned peer-reviewed rapid-communication journal that publishes short original research papers every two weeks. Its broad and interdisciplinary scope covers the latest developments in all electronic engineering related fields including communication, biomedical, optical and device technologies. Electronics Letters also provides further insight into some of the latest developments through special features and interviews.
Scope
As a journal at the forefront of its field, Electronics Letters publishes papers covering all themes of electronic and electrical engineering. The major themes of the journal are listed below.
Antennas and Propagation
Biomedical and Bioinspired Technologies, Signal Processing and Applications
Control Engineering
Electromagnetism: Theory, Materials and Devices
Electronic Circuits and Systems
Image, Video and Vision Processing and Applications
Information, Computing and Communications
Instrumentation and Measurement
Microwave Technology
Optical Communications
Photonics and Opto-Electronics
Power Electronics, Energy and Sustainability
Radar, Sonar and Navigation
Semiconductor Technology
Signal Processing
MIMO
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