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dc.contributor.authorCheng, Shih-Songen_US
dc.contributor.authorHuang, Sheng-Chiehen_US
dc.contributor.authorTran, Trong-Hieuen_US
dc.contributor.authorShao, Kai-Yuen_US
dc.contributor.authorChao, Paul C. -P.en_US
dc.contributor.authorChiang, Pei-Yuen_US
dc.date.accessioned2018-08-21T05:54:00Z-
dc.date.available2018-08-21T05:54:00Z-
dc.date.issued2016-06-01en_US
dc.identifier.issn0946-7076en_US
dc.identifier.urihttp://dx.doi.org/10.1007/s00542-016-2896-1en_US
dc.identifier.urihttp://hdl.handle.net/11536/145450-
dc.description.abstractThis study presents a novel readout circuit that serves to evaluate quantity of skin melanin in a noninvasive way via utilizing a photoplethysmography (PPG) optical sensor. PPG sensors are widely used nowadays for noninvasive diagnosis due to their salient features such as low cost and easy-to-useness. PPG signal is known highly correlated with human skin condition and cardiovascular system health. A new readout circuit featuring high-bandwidth, low-noise and low-power is designed in this study to evaluate quantitatively the melanin content of human skin based on PPG signals with high accuracy. This new readout circuit is intended to convert and amplify the electric current of the photo diode in the PPG sensor to voltage signals, and then being further properly amplified to the full dynamic range of the chip circuit fabricated by the TSMC 0.18 mu m process for maximum S/N ratios. The designed circuit has a front-end transimpedance amplifier (TIA), 60 dB in gain, with a degenerate resistor to perform a low noise less than 3 A mu V/aeHz while operating by a 3.3 V supply. In related circuit designs, the mismatch in current sources caused by CMOS process variation is mitigated by a current steering digital-analog-converter (DAC) with least significant bit (LSB) corresponding to 1.25 A mu A. Both TIA and DAC are designed with effort to render high accuracy in the digital outputs for the levels of sensed melanin. The power consumption of chip design is as low as 1.5 mW, while the error rate between measurement and simulation result is less than 3 %.en_US
dc.language.isoen_USen_US
dc.titleA 1.5 mW front-end readout circuit for a small-sized melanin sensoren_US
dc.typeArticleen_US
dc.identifier.doi10.1007/s00542-016-2896-1en_US
dc.identifier.journalMICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMSen_US
dc.citation.volume22en_US
dc.citation.spage1449en_US
dc.citation.epage1465en_US
dc.contributor.department電機工程學系zh_TW
dc.contributor.departmentDepartment of Electrical and Computer Engineeringen_US
dc.identifier.wosnumberWOS:000376295400034en_US
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