Title :
Low-power temperature-independent ambient light sensor
Author :
Cho, Soon-Ik ; Park, Je-Ho ; Lim, S.-I. ; Kim, Sungho ; Baek, Kang-Hyun
Author_Institution :
Dept. of Electron. Eng., Korea Univ., Seoul, South Korea
Abstract :
Presented is an ambient light sensor (ALS) for portable electronic devices. The proposed ALS employs illuminance-dependent resolution adjustment and dark current compensation auxiliary circuits to consume low power, occupy small area, as well as achieve temperature-independent linearity. The ALS can convert illuminance of up to 16Klx to digital data without temperature-dependent dark current disturbance, while consuming a maximum 75 μA current and occupying only 640 × 420 m area, including a 120 × 120 m photodiode.
Keywords :
lighting; optical sensors; photodiodes; power consumption; ALS; ambient light sensor; current 75 muA; dark current compensation auxiliary circuits; illuminance-dependent resolution adjustment; photodiodes; portable electronic devices; power consumption; temperature-dependent dark current disturbance;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2011.1506