Constraint Condition of the Loop Filter for the Convergence of Random Jitter Accumulation in Digital Repeater Chain

디지털 중계단에서 랜덤 지터 누적의 수렴을 위한 루우프 여파기의 제한조건

The constraint condition of the loop filter is persented for the convergence of the random jitter accumulation fo the 2-nd order PLL (phase-locked loop) circuit used in digital regenerative repeater. This condition is confirmed under the assumption that the number of repeater chain is 5, bandwidth is 100. 0KHz, the power spectral density of white Gaussian noise is 1.0x10**-6 [W/Hz]. Also, it is shown that if the condition is satisfied, the accumulated random jitter and the alignment jitter will have the saturation characteristics.