{"title":"具有动态LSB自适应和纯采集系统低位深度5 μ w峰值功率比例读出的成像仪","authors":"K. Ahmed, Longyang Lin, P. Salamani, M. Alioto","doi":"10.1109/vlsitechnologyandcir46769.2022.9830147","DOIUrl":null,"url":null,"abstract":"An imager with μW peak power is introduced for purely-harvested operation. The LSB is dynamically adapted to the light intensity of the scene for aggressive bit depth downscaling, avoiding traditional dynamic range over-margining across practical light intensities under fixed LSB. Ratiometric readout of pixel current cancels threshold voltage mismatch. A 256×256-pixel 180-nm imager shows 5-μW power at 1 fps and 4 bits, while keeping ImageNet classification accuracy drop to percentage points under 75-dB ambient light range, across original and brightness-adjusted images.","PeriodicalId":332454,"journal":{"name":"2022 IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits)","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2022-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":"{\"title\":\"Imager with Dynamic LSB Adaptation and Ratiometric Readout for Low-Bit Depth 5-μW Peak Power in Purely-Harvested Systems\",\"authors\":\"K. Ahmed, Longyang Lin, P. Salamani, M. Alioto\",\"doi\":\"10.1109/vlsitechnologyandcir46769.2022.9830147\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"An imager with μW peak power is introduced for purely-harvested operation. The LSB is dynamically adapted to the light intensity of the scene for aggressive bit depth downscaling, avoiding traditional dynamic range over-margining across practical light intensities under fixed LSB. Ratiometric readout of pixel current cancels threshold voltage mismatch. A 256×256-pixel 180-nm imager shows 5-μW power at 1 fps and 4 bits, while keeping ImageNet classification accuracy drop to percentage points under 75-dB ambient light range, across original and brightness-adjusted images.\",\"PeriodicalId\":332454,\"journal\":{\"name\":\"2022 IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits)\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2022-06-12\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"2022 IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/vlsitechnologyandcir46769.2022.9830147\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"2022 IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/vlsitechnologyandcir46769.2022.9830147","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Imager with Dynamic LSB Adaptation and Ratiometric Readout for Low-Bit Depth 5-μW Peak Power in Purely-Harvested Systems
An imager with μW peak power is introduced for purely-harvested operation. The LSB is dynamically adapted to the light intensity of the scene for aggressive bit depth downscaling, avoiding traditional dynamic range over-margining across practical light intensities under fixed LSB. Ratiometric readout of pixel current cancels threshold voltage mismatch. A 256×256-pixel 180-nm imager shows 5-μW power at 1 fps and 4 bits, while keeping ImageNet classification accuracy drop to percentage points under 75-dB ambient light range, across original and brightness-adjusted images.