Publication: A Nanopower Biopotential Lowpass Filter Using Subthreshold Current-Reuse Biquads with Bulk Effect Self-Neutralization
Issued Date
2019-05-01
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ISSN
15498328
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2-s2.0-85059021423
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Mahidol University
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SCOPUS
Bibliographic Citation
IEEE Transactions on Circuits and Systems I: Regular Papers. Vol.66, No.5 (2019), 1746-1757
Suggested Citation
Chutham Sawigun, Surachoke Thanapitak A Nanopower Biopotential Lowpass Filter Using Subthreshold Current-Reuse Biquads with Bulk Effect Self-Neutralization. IEEE Transactions on Circuits and Systems I: Regular Papers. Vol.66, No.5 (2019), 1746-1757. doi:10.1109/TCSI.2018.2885954 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/50847
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Title
A Nanopower Biopotential Lowpass Filter Using Subthreshold Current-Reuse Biquads with Bulk Effect Self-Neutralization
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Abstract
© 2018 IEEE. A nanopower CMOS 4th-order lowpass filter suitable for biomedical applications is presented. The filter is formed by cascading two types of subthreshold current-reuse biquadratic cell. Each proposed cell is capable of neutralizing the bulk effect that induces the passband attenuation. The nearly 0-dB passband gain can thus be maintained, while the entire filter circuit remains compact and power-efficient. Designed for electrocardiogram detection as an example of application, the filter prototype has been fabricated in a 0.35 μm CMOS process occupying 269 μm × 383 μm chip area. Measurements verify that the filter can operate from a 1.5-V single supply and consumes 5.25 nW, while providing a cutoff frequency of 100 Hz and input-referred noise of 39.38 μ V rms . The intermodulation-free dynamic range of 51.48 dB is obtained from a two-tone test of 50 and 60 Hz input frequencies. Compared with state-of-the-art nanopower lowpass filters using the most relevant and reasonable figure of merit, the proposed filter ranks the best.