| CPC H04L 7/0033 (2013.01) | 16 Claims |
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1. A calibration method configured for calibrating a delay time of a clock recovery circuit and comprising:
configuring a reference signal source to output a reference signal; wherein the reference signal comprises a first quantity of reference signal waves;
delaying the reference signal through a delay chain to output a delay signal; wherein the delay chain comprises a plurality of delay units;
synchronous sampling the reference signal and the delay signal;
adding 1 count and obtaining a count value when a sampling result is in a preset state;
determining whether a ratio between the count value and the first quantity is within a preset range;
obtaining an average delay time according to a time width of the reference signal wave and a number of the delay units opened in the delay chain when the ratio is within the preset range; and
outputting a control signal to the clock recovery circuit according to the average delay time to calibrate the delay time of the clock recovery circuit.
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