Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yuichiro Nakata0
Junji Fujino0
Shinichi Otsuka0
Date of Patent
August 23, 2011
0Patent Application Number
129068390
Date Filed
October 18, 2010
0Patent Primary Examiner
Patent 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.
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