ANALOG-TO-DIGITAL CONVERTER WITH AN OVER-RANGE STAGE
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United States of America
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Jan 16, 2025
app pub date -
Nov 30, 2023
filing date -
Nov 30, 2023
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Abstract
An analog-to-digital converter (ADC) includes: a time-domain ADC core; and a calibration circuit. The time-domain ADC core includes: a first delay-to-digital stage having a terminal; a second delay-to-digital stage having a terminal; a third delay-to-digital stage having a terminal. The calibration circuitry is coupled to the terminal of the first delay-to-digital stage, the terminal of the second delay-to-digital stage, and the terminal of the third delay-to-digital stage of stages. The calibration circuitry is configured to calibrate the first delay-to-digital stage, the second delay-to-digital stage, and the third delay-to-digital stage based on a zero-crossing calibration and an over-range calibration. The over-range calibration sets a maximum threshold and a minimum threshold for the time-domain ADC relative to a reference voltage.
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