A 38.4 nW, 1.2 V, 250-Hz, 2<sup>nd</sup>-Order g<inf>m</inf> - C LPF With Degenerative SCP Transconductors Achieving 800-mV<inf>PP</inf> Input Range and 82.1- μV<inf>rms</inf> IRN for ECG Acquisition
5
Issued Date
2025-01-01
Resource Type
ISSN
15497747
eISSN
15583791
Scopus ID
2-s2.0-86000383074
Journal Title
IEEE Transactions on Circuits and Systems II: Express Briefs
Volume
72
Issue
1
Start Page
3
End Page
7
Rights Holder(s)
SCOPUS
Bibliographic Citation
IEEE Transactions on Circuits and Systems II: Express Briefs Vol.72 No.1 (2025) , 3-7
Suggested Citation
Thanapitak S., Pawarangkoon P., Surakampontorn W., Ahmad R., Abdullah Zawawi R., Manaf A.A., Adirek S., Chanapromma C. A 38.4 nW, 1.2 V, 250-Hz, 2<sup>nd</sup>-Order g<inf>m</inf> - C LPF With Degenerative SCP Transconductors Achieving 800-mV<inf>PP</inf> Input Range and 82.1- μV<inf>rms</inf> IRN for ECG Acquisition. IEEE Transactions on Circuits and Systems II: Express Briefs Vol.72 No.1 (2025) , 3-7. 7. doi:10.1109/TCSII.2024.3451494 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/106737
Title
A 38.4 nW, 1.2 V, 250-Hz, 2<sup>nd</sup>-Order g<inf>m</inf> - C LPF With Degenerative SCP Transconductors Achieving 800-mV<inf>PP</inf> Input Range and 82.1- μV<inf>rms</inf> IRN for ECG Acquisition
Corresponding Author(s)
Other Contributor(s)
Abstract
In this brief, a 2{^{\text {nd} -order gm - C lowpass filter with a practical input linear range of 400mV P dedicated to ECG signal acquisition is proposed. This filter employs a degenerative source-coupled-pair circuit as a gm cell. It enhances the linear input range by a factor of × 4 compared with the source follower filter. Additionally, to mitigate the effect of current source mismatch, a dynamic element matching technique is applied. By doing so, HD2 is suppressed more than 1.5 dB over the entire passband frequency. This proposed filter is implemented in a 0.18 μ m CMOS process. It offers a 250-Hz bandwidth with input-referred noise and a dynamic range of 82.1 μ Vrms and 67.34 dB, respectively. The power consumption of 38.4 nW is achieved with a 1.2 V supply. Compared with other recent nano-power filters, the proposed filter provides the highest linear input range with competitive Figure-of-Merit to the top-tier designs. It is therefore beneficial to the practical implementation of a low-power ECG acquisition system.