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An ULV PWM CMOS Imager With Adaptive-Multiple-Sampling Linear Response, HDR Imaging, and Energy Harvesting.
- Source :
- IEEE Journal of Solid-State Circuits; Jan2019, Vol. 54 Issue 1, p298-306, 9p
- Publication Year :
- 2019
-
Abstract
- This paper presents an ultra-low-voltage (ULV) $300\times 200$ pixel pulsewidth-modulation (PWM) CMOS imager with monitoring and capturing for Internet-of-Things (IoT) and artificial intelligent (AI) applications, fabricated in the CMOS 0.18- $\mu \text{m}$ standard process technology. In always-ON monitoring operation, the imager provides high dynamic range (HDR) and energy harvesting (EH) modes for event detection and energy collection, respectively. In low-power image capturing operation, the imager provides a linear-response (LR) mode for object identification and recording. In the LR mode, the proposed ULV PWM pixel with threshold variation cancellation (TVC) achieves a non-linearity of +0.36/ā0.29% and a fixed-pattern noise (FPN) of 0.159%. With the proposed pixel-wise adaptive-multiple-sampling (AMS) scheme and the corresponding $n$ -time multiple sampling using dual-slope ramping (DSR) reference, the 0.4-V-operated PWM pixel achieves a total noise of 9.42eā at 4-time AMS operation. The achieved peak signal-to-noise ratio (PSNR) and dynamic range (DR) are 60.1 dB in the LR mode and 141 dB in the HDR mode, respectively, and the harvested power is 15.5 $\mu \text{W}$ at 60 klx in the EH mode. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00189200
- Volume :
- 54
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- IEEE Journal of Solid-State Circuits
- Publication Type :
- Academic Journal
- Accession number :
- 134230877
- Full Text :
- https://doi.org/10.1109/JSSC.2018.2870559