Clock signal skew calibration apparatus and control method
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United States of America
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Feb 18, 2025
Grant Date -
Jan 30, 2025
app pub date -
Jul 27, 2023
filing date -
Jul 27, 2023
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Abstract
An apparatus includes a clock skew calibration circuit configured to be coupled to a multi-phase clock generator through a plurality of delay lines, wherein a first clock skew calibration unit comprises a frequency doubler configured to receive a plurality of multi-phase clock signals and generate a clock signal based on the plurality of multi-phase clock signals, a frequency divider configured to receive the clock signal and generate a reduced frequency signal based on the clock signal, and a delay line control circuit configured to compare the duty cycle of the reduced frequency signal with a predetermined duty cycle, and generate a first control signal to adjust the skew of the first multi-phase clock signal through adjusting a first delay applied to the first multi-phase clock signal until a calibrated signal of the first multi-phase clock signal is achieved.
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