{"title":"A high background light subtraction circuit for long range time-of-flight cameras","authors":"C. Anand, K. Jainwal, M. Sarkar","doi":"10.1109/APCCAS.2016.7804010","DOIUrl":null,"url":null,"abstract":"In this paper, a background light subtraction circuit is presented for a long range time-of-flight camera in outdoor applications. A low (de)modulation frequency is used for long range estimation, which saturates the photodiode due to integration of high-intensity background light. Therefore, long range cameras are generally limited to indoor applications. In this work, a circuit is proposed to subtract up to 120 klx BGL for 1.07–9.65 m distance. A (de)modulation frequency of 2.33 MHz with 33 % duty-cycle is used. The measurement results show a range resolution of 1.49 cm and 65 cm for 1.07 m and 9.65 m distance, respectively at 120 klx background light. The circuit is fabricated and characterized in UMC 180 nm technology.","PeriodicalId":6495,"journal":{"name":"2016 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS)","volume":"125 1","pages":"487-490"},"PeriodicalIF":0.0000,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2016 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/APCCAS.2016.7804010","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 3
Abstract
In this paper, a background light subtraction circuit is presented for a long range time-of-flight camera in outdoor applications. A low (de)modulation frequency is used for long range estimation, which saturates the photodiode due to integration of high-intensity background light. Therefore, long range cameras are generally limited to indoor applications. In this work, a circuit is proposed to subtract up to 120 klx BGL for 1.07–9.65 m distance. A (de)modulation frequency of 2.33 MHz with 33 % duty-cycle is used. The measurement results show a range resolution of 1.49 cm and 65 cm for 1.07 m and 9.65 m distance, respectively at 120 klx background light. The circuit is fabricated and characterized in UMC 180 nm technology.
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