Invention Grant
- Patent Title: Device for ambient light compensation for optical sensors exposed to both useful light and ambient light
- Patent Title (中): 暴露在有光和环境光下的光学传感器的环境光补偿装置
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Application No.: US13537531Application Date: 2012-06-29
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Publication No.: US08822901B2Publication Date: 2014-09-02
- Inventor: Wolfram Budde , Wolfgang Büsser
- Applicant: Wolfram Budde , Wolfgang Büsser
- Applicant Address: DE Dortmund
- Assignee: ELMOS Semiconductor AG
- Current Assignee: ELMOS Semiconductor AG
- Current Assignee Address: DE Dortmund
- Agency: Shumaker & Sieffert, P.A.
- Priority: EP11173802 20110713
- Main IPC: G01J1/44
- IPC: G01J1/44 ; G01J1/32
Abstract:
The device for ambient light compensation for use in optical sensors exposed to both useful light and ambient light comprises at least one first photodiode and at least one second photodiode, the at least one first photodiode being adapted to be exposed to substantially the same useful light and ambient light as the at least one second photodiode. The device further comprises a current mirror circuit having an input and an output, the at least one first photodiode being connected to the input of the current mirror circuit, and the at least one second photodiode being connected to the output of the current mirror circuit. The current mirror circuit comprises a lowpass filter connected between the input and the output of the current mirror circuit. The output of the current mirror circuit provides an output signal representing the useful signal compensated for ambient light.
Public/Granted literature
- US20130015330A1 DEVICE FOR AMBIENT LIGHT COMPENSATION FOR OPTICAL SENSORS EXPOSED TO BOTH USEFUL LIGHT AND AMBIENT LIGHT Public/Granted day:2013-01-17
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