Ambient light filter and associated photo sensor having a first detection mode in at least one optical pulse gap
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United States of America Patent
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Feb 23, 2021
Grant Date -
Oct 26, 2017
app pub date -
Apr 1, 2017
filing date -
Apr 21, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
An ambient light filter configured to filter ambient light noises from an optical current that is at least partially caused by an optical pulse sequence emitted by a light emitting device, can include: a sample and detection circuit configured to sample the optical current and to obtain a current component in a first mode, and to remove the current component from the optical current and to generate a detection signal in a second mode; a current amplifier configured to receive the detection signal, and to generate an amplified current signal; and a control circuit configured to switch the sample and detection circuit between the first and second modes, where the control circuit switches the sample and detection circuit to the first mode in at least one optical pulse gap, and switches the sample and detection circuit to the second mode when a next optical pulse arrives.
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