Power management is one of the most important issues in portable electronics like cell phone, PDA, UMPC, GPS, MP3
player and laptop computer. Ambient Light Sensors are getting popular as a most effective solution to extend battery
lifetime for these devices. This paper provides basic information about ambient light sensors on a general level and
introduces an ultra low-power ambient light sensor for portable electronics. The implemented ambient light sensor
converts light illuminance to 5-digital codes every 300ms which can measure illuminance from 10 to 1000 Lux
consuming only 5uA. An IR-reject optical filter and a built-in integrating analog-to-digital converter reduce influences of
infrared ray and 50Hz/60Hz noise from artificial light sources respectively. The ambient light sensor is fabricated in a
standard CMOS 0.5-um process technology. Test results show that the implemented ambient light sensor has
incandescent/fluorescent light sensitivity ratio around 2.3.
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