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Infrared photocurrent front-end ADC for rain-sensing system with ambient light compensation
Infrared photocurrent front-end ADC for rain-sensing system with ambient light compensation
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机译:红外光电流前端ADC,用于具有环境光补偿的雨感系统
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摘要
Systems and methods for a front-end circuit receiving a current from a photodiode receiving a signal light and ambient light have been disclosed. In a preferred embodiment the front-end circuit accommodates a photo diode current, generated by a signal light from an infrared LED diode in presence of a current generated by ambient light for a rain-sensing system. The circuit invented has a high dynamic range comprising a programmable transresistance amplifier, a switched capacitor programmable gain amplifier and a switched capacitor fourth- order oversampled sigma-delta A/D converter including an optimized digital filter. Furthermore coarse and fine IDACs are used to successively subtract a current generated by ambient light.
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