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Open AccessArticle

A 1-nS 1-V Sub-1-µW Linear CMOS OTA with Rail-to-Rail Input for Hz-Band Sensory Interfaces

Faculty of Electronics, Gdańsk University of Technology, 80-233 Gdańsk, Poland
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Sensors 2020, 20(11), 3303; https://doi.org/10.3390/s20113303
Received: 7 May 2020 / Revised: 4 June 2020 / Accepted: 8 June 2020 / Published: 10 June 2020
(This article belongs to the Section Biomedical Sensors)
The paper presents an operational transconductance amplifier (OTA) with low transconductance (0.62–6.28 nS) and low power consumption (28–270 nW) for the low-frequency analog front-ends in biomedical sensor interfaces. The proposed OTA implements an innovative, highly linear voltage-to-current converter based on the channel-length-modulation effect, which can be rail-to-rail driven. At 1-V supply and 1-Vpp asymmetrical input driving, the linearity error in the current-voltage characteristics is 1.5%, while the total harmonic distortion (THD) of the output current is 0.8%. For a symmetrical 2-Vpp input drive, the linearity error is 0.3%, whereas THD reaches 0.2%. The linearity is robust for the mismatch and the process-voltage-and-temperature (PVT) variations. The temperature drift of transconductance is 10 pS/°C. The prototype circuit was fabricated in 180-nanometer CMOS technology. View Full-Text
Keywords: very low frequency; operational transconductance amplifier (OTA); biomedical sensor interface; biomedical electronics; low-voltage low-power electronics; CMOS very low frequency; operational transconductance amplifier (OTA); biomedical sensor interface; biomedical electronics; low-voltage low-power electronics; CMOS
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MDPI and ACS Style

Jakusz, J.; Jendernalik, W.; Blakiewicz, G.; Kłosowski, M.; Szczepański, S. A 1-nS 1-V Sub-1-µW Linear CMOS OTA with Rail-to-Rail Input for Hz-Band Sensory Interfaces. Sensors 2020, 20, 3303. https://doi.org/10.3390/s20113303

AMA Style

Jakusz J, Jendernalik W, Blakiewicz G, Kłosowski M, Szczepański S. A 1-nS 1-V Sub-1-µW Linear CMOS OTA with Rail-to-Rail Input for Hz-Band Sensory Interfaces. Sensors. 2020; 20(11):3303. https://doi.org/10.3390/s20113303

Chicago/Turabian Style

Jakusz, Jacek; Jendernalik, Waldemar; Blakiewicz, Grzegorz; Kłosowski, Miron; Szczepański, Stanisław. 2020. "A 1-nS 1-V Sub-1-µW Linear CMOS OTA with Rail-to-Rail Input for Hz-Band Sensory Interfaces" Sensors 20, no. 11: 3303. https://doi.org/10.3390/s20113303

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