| 摘要 |
<p>The digital signal is sampled (110) at sampling time derived from an offset reference clock signal (101, 102, 103) so that, in the absence of jitter and said offset by a predetermined frequency, there are a predetermined number of sampling times in each bit of said digital signal. Once the samples of the digital signal have been obtained, a count (119) is made of the occasions when there are more or less than the predetermined number of sampling times within any bit of the digital signal over a predetermined period, counting up when the occasion is greater than the predetermined number and down when the occasion is less than the predetermined number. A coarse jitter measurement is then obtained by determining the differences between the maximum count value and the minimum count value minus and divided by an integer value. In addition, a fine jitter measurement is obtained.</p> |
