SIGNAL PROCESSING CIRCUIT, AND LIGHT DETECTING DEVICE
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United States of America
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Issued Date -
Apr 10, 2025
app pub date -
Jan 27, 2023
filing date -
Jan 27, 2023
priority date (Note) -
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status (Latency Note)
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Abstract
In a signal processing circuit, an input terminal is configured to receive an analog signal output from an avalanche photodiode operating in Geiger mode. A comparison circuit outputs a signal based on a component exceeding a threshold among components a signal input to the comparison circuit. The adjustment circuit includes an AC coupling unit, a level shifter unit, and a reference value adjustment unit. The AC coupling unit establishes AC coupling between the input terminal and the comparison circuit. The level shifter unit adjusts the voltage of the signal input to the comparison circuit to a value lower than a reverse bias voltage applied to the avalanche photodiode. The reference value adjustment unit adjusts the reference value of the signal input to the comparison circuit.
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