ANALOG-TO-DIGITAL CONVERSION CIRCUIT, SOLID-STATE IMAGE SENSOR, AND METHOD FOR CONTROLLING ANALOG-TO-DIGITAL CONVERSION CIRCUIT
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United States of America Patent
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Nov 16, 2023
app pub date -
Aug 11, 2021
filing date -
Aug 11, 2021
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Abstract
Power consumption is reduced in an analog-to-digital conversion circuit using a TDC. The analog-to-digital conversion circuit includes a comparator, a counter, a time-to-digital converter, and a holding unit. The comparator compares an analog signal with a predetermined reference signal and outputs a comparison result. The counter counts a predetermined count value and outputs a bit string indicating the count value. The time-to-digital converter converts, into a digital signal, a time from when the comparison result is inverted until a least significant bit of the bit string reaches a predetermined value. The holding unit holds the bit string of when the comparison result is inverted.
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