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14.85 µW Analog Front-End for Photoplethysmography Acquisition with 142-dBΩ Gain and 64.2-pArms Noise

1
Department of Microelectronics, Shanghai Jiao Tong University, Shanghai 200240, China
2
MoE Key Lab of Artificial Intelligence, AI Institute, Shanghai Jiao Tong University, Shanghai 200240, China
3
Electrical Engineering Department, Assiut University, Assiut 71516, Egypt
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(3), 512; https://doi.org/10.3390/s19030512
Received: 7 October 2018 / Revised: 19 January 2019 / Accepted: 21 January 2019 / Published: 26 January 2019
(This article belongs to the Section Physical Sensors)
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Abstract

A low-power, high-gain, and low-noise analog front-end (AFE) for wearable photoplethysmography (PPG) acquisition systems is designed and fabricated in a 0.35 μm CMOS process. A high transimpedance gain of 142 dBΩ and a low input-referred noise of only 64.2 pArms was achieved. A Sub-Hz filter was integrated using a pseudo resistor, resulting in a small silicon area. To mitigate the saturation problem caused by background light (BGL), a BGL cancellation loop and a new simple automatic gain control block are used to enhance the dynamic range and improve the linearity of the AFE. The measurement results show that a DC photocurrent component up-to-10 μA can be rejected and the PPG output swing can reach 1.42 Vpp at THD < 1%. The chip consumes a total power of 14.85 μW using a single 3.3-V power supply. In this work, the small area and efficiently integrated blocks were used to implement the PPG AFE and the silicon area is minimized to 0.8 mm × 0.8 mm. View Full-Text
Keywords: analog front-end; low power; photoplethysmography; transimpedance amplifier analog front-end; low power; photoplethysmography; transimpedance amplifier
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Lin, B.; Atef, M.; Wang, G. 14.85 µW Analog Front-End for Photoplethysmography Acquisition with 142-dBΩ Gain and 64.2-pArms Noise. Sensors 2019, 19, 512.

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