CMOS Skin Sensor for Mobile Skin Diagnosis Using an Electronic Cotton Pad
| Autor: | Hyunsub Norbert Rie, Junhyung Cho, Jungjoon Lee, Srinivas Gandla, Seong-Jin Kim, Jaehyuk Choi |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | IEEE Access, Vol 8, Pp 178816-178824 (2020) |
| Druh dokumentu: | article |
| ISSN: | 2169-3536 81963742 |
| DOI: | 10.1109/ACCESS.2020.3026382 |
| Popis: | This paper presents a complementary metal-oxide semiconductor (CMOS) skin sensor for detecting hydration, sebum, and ultraviolet (UV) protection. This sensor employs pixels comprising interdigitated capacitors (IDCs) for detecting hydration and a 30 × 24 photodiode (PD) array for detecting UV protection and sebum. The 4 × 8 pixels with IDCs over the PDs are used for area efficiency; they afford reliable detection regardless of the skin contact area and a high sensitivity, which is achieved via pixel merging. For the readout of both IDCs and PDs, a column-parallel multiple-sampling analog front-end and a 9b successive approximation register analog-to-digital converter are integrated. To detect UV protection under different wavelengths of UVA and UVB, we implement the spatiotemporal delta readout of the PDs. Furthermore, a fully characterized, proof-of-concept prototype chip is fabricated using a 110-nm CMOS process. Compared with conventional skin sensors, the proposed sensor exhibits higher sensitivities of 0.25%/min and 2.32%/mL in detecting dehydration rate and sebum levels, respectively. Moreover, the sensor can detect UV protection under UVA and UVB wavelengths. Owing to its core size of 2.32 × 4.65 mm2, the proposed sensor can potentially be integrated into cotton pads for mobile skin diagnosis. |
| Databáze: | Directory of Open Access Journals |
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