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As a system‐level photodetector, flexible light‐to‐frequency conversion circuits (LFCs) are implemented using a‐IGZO and SWNT thin‐film transistors. Combined with LFC, CMOS‐based frequency‐to‐digital converter is integrated for digitization of analog signal from LFCs. With the better noise immunity on LFCs, the proposed system by Junyoung Song, Sung Hun Jin, and co‐workers (article number 2008131)...
In this study, as system‐level photodetectors, light‐to‐frequency conversion circuits (LFCs) are realized by i) photosensitive ring oscillators (ROs) composed of amorphous indium‐gallium‐zinc‐oxide/single‐walled carbon nanotube (a‐IGZO/SWNT) thin film transistors (TFTs) and ii) phase‐locked‐loop Si circuits built with frequency‐to‐digital converters (PFDC). The 3‐stage ROs and logic gates based on...
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