DELAY CALIBRATION CIRCUIT AND DELAY CALIBRATION METHOD THEREOF
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United States of America
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Feb 6, 2025
app pub date -
Dec 30, 2023
filing date -
Dec 30, 2023
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Abstract
A delay calibration circuit includes a first delay chain, a second delay chain, and a calibration circuit. The first delay chain includes a plurality of first delay units and delays a clock signal with a first delay to generate a first delay signal. The supply current for each of the first delay units is a first current. The second delay chain includes a plurality of second delay units and a third delay unit. The second delay units delay a first signal with a second delay to generate a second delay signal. The third delay unit delays the second delay signal to generate the third delay signal. The supply current for each unit in the second delay chain is a second current. The calibration circuit adjusts a current ratio of the second current to the first current based on the second delay signal and the third delay signal.
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