Ambient light sensor

Details Ambient light sensor Ambient light sensor

2008-11-25

2010-11-23

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140LS, C250S2140AG, C327S514000

Reexamination Certificate

active

07838811

ABSTRACT:
In an ambient light sensor according to the present invention, a current amplification portion which amplifies a light current obtained by a light receiving portion to generate an output signal includes: a current amplification stage that has: a first current mirror amplifier which is composed of a bipolar transistor, and a second current mirror amplifier which is composed of a field effect transistor connected in parallel with the first current mirror amplifier; and a changeover control circuit which monitors an amplified current input into the current amplification stage, and performs changeover control of the first and second current mirror amplifiers according to a value of the amplified current.

REFERENCES:
patent: 3943380 (1976-03-01), Morgan et al.
patent: 2002-176192 (2002-06-01), None

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