| 摘要 |
<p>A method (10) of measuring the phase of a clock signal, the method comprising: a) receiving a clock signal comprising clock cycles having a clock frequency and a clock period, TClock (12); b) providing a reference clock signal comprising reference clock cycles having a reference clock period, TRef, and a reference clock frequency different to the clock frequency (14); c) for each of a plurality, N, of reference clock cycles, comparing the clock signal to the reference clock signal and determining a phase difference between said signals (16); d) obtaining a sum of the phase differences for a said plurality of reference clock cycles (18); e) for each of the plurality of reference clock cycles, subtracting an oldest phase difference from the sum and adding the phase difference for the said reference clock cycle to the sum to provide a new sum, the new sum being indicative of the phase of the clock signal at the said reference clock cycle (20); and f) generating and transmitting a clock phase signal indicative of the new sum (22).</p> |
