An ultra-low-power ambient light sensor for portable devices

Soon-Ik Cho; Yun-Jeong Kim; Jong-Ho Lee; Kwang-Hyun Baek; Suki Kim

doi:10.1117/12.807927

10 February 2009 An ultra-low-power ambient light sensor for portable devices

Soon-Ik Cho, Yun-Jeong Kim, Jong-Ho Lee, Kwang-Hyun Baek, Suki Kim

Author Affiliations +

Proceedings Volume 7219, Optoelectronic Integrated Circuits XI; 72190U (2009) https://doi.org/10.1117/12.807927
Event: SPIE OPTO: Integrated Optoelectronic Devices, 2009, San Jose, California, United States

Abstract

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.

Citation Download Citation

Soon-Ik Cho, Soon-Ik Cho, Yun-Jeong Kim, Yun-Jeong Kim, Jong-Ho Lee, Jong-Ho Lee, Kwang-Hyun Baek, Kwang-Hyun Baek, Suki Kim, Suki Kim, "An ultra-low-power ambient light sensor for portable devices", Proc. SPIE 7219, Optoelectronic Integrated Circuits XI, 72190U (10 February 2009); doi: 10.1117/12.807927; https://doi.org/10.1117/12.807927

ACCESS THE FULL ARTICLE

PERSONAL SIGN IN
Full access may be available with your subscription

Email or Username Forgot your username?

Password Forgot your password?

Show

Remember Email/Username on this computer

Remember Password

No SPIE account? Create an account
or Institutional Sign In via Shibboleth

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $14.40

Non-members: $18.00 ADD TO CART

Show All Keywords

Keywords/Phrases

Search In:

Publication Years