Agilent 5991-2567EN English 2014-08-03 PDF 2.37 MB c20140729 [13] free download

File name 5991-2567EN English _ 2014-08-03 _ PDF 2.37 MB c20140729 [13].pdf

Keysight Technologies An Innovative Simulation Workflow for Debugging High-Speed Digital Designs Using Jitter Separation White Paper Abstract This paper presents a new simulation workflow for jitter separation analysis. Jitter separation is a very promising tool that quickly identifies the sources of signal integrity degradation and thus enables easy optimization of a design to meet the low jitter requirements of multi-gigabit high speed digital SERDES devices. 1.0 Introduction As data rates in high-speed products increase, identifying and solving signal integrity problems becomes critical. Timing margins are becoming increasingly tight. Several distinct effects influence the integrity of signals. The deviation of a signal transition from its ideal time is defined as jitter. Jitter becomes a problem when out-of-place edges start to corrupt the zero/ one decision that should occur in the slicer circuit in the receiver. Breaking jitter into its various components is required to diagnose the most severe jitter problems. Several factors affect jitter. Power supply noise is a big contributor to the total jitter in the system. A power delivery network has a substantial impedance which causes a voltage ripple on the IC`s supply lines. This supply noise translates into jitter on the clock and data edges. The amount of jitter is modulated by channel dispersion as signals propagate in the system. Channel loss, reflections and distortions from impedance discontinuities in the signal or return path, lead to attenuated and smeared data edges which can then cause inter-symbol interference (ISI). It is observed in both measurements and simula- tions that jitter can be amplified by a lossy channel even when the channel is linear, passive and noiseless [1]. 1 C. Chastang, 2 A. Amedeo 1 V. Poisson, 1 P. Grison, 2 F. Demuynck C. Gautier, F. Costa Thales Communications & Security Keysight