在数字通信网中,由噪声、数字再生中继器、数字复接器及数字分接器等引起的抖动,其最终的表现皆为相位抖动,各种抖动迭加、积累有时会产生大于几个UI的瞬时相位抖动幅度。相位抖动是一个抖动的时钟的零交点间隔与无抖动的同一时钟零交点间隔的差别。在这里,我们认为抖动主要是由角度调制产生的。 In the digital communications network, the jitter caused by noise, digital regenerative repeaters, digital multiplexers and digital dividers, etc., are the final performance of the phase jitter, jitter superimposed, the accumulation will sometimes produce more than a few UI instantaneous phase jitter amplitude. Phase jitter is the difference between the zero-crossing interval of a jittered clock and the zero-crossing interval of the same clock without jitter. Here, we think jitter is mainly caused by angle modulation.