Low-power temperature-independent ambient light sensor

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 mu A current and occupying only 640 x 420 mu m area, including a 120 x 120 mm photodiode.