High speed interconnect data dependent jitter analysis

Closed-Form Equation of Data Dependent Jitter in First Order Low Pass System

“…So far, some papers have been published to predict the DDJ in the general transmission lines [ 7 – 9 ] and in the first order low pass systems [ 10 – 14 ]. The DDJ in the transmission line may apply to the interconnect channels such as off-chip PCB traces, off-chip cables, and on-chip interconnect lines while the DDJ in the first order low pass system may apply to the transceiver circuit building blocks such as drivers, buffers, amplifiers, and limiters.…”

“…On the other hand, for the first order low pass systems, the DDJ has been predicted based on the infinite number of calculated pulse or step responses of all the previous bits while the rise/fall time of the input signal was assumed to be zero ideally. However, because it is not possible to calculate the infinite number of pulse or step responses of all the previous bits, only two or four preceding bits have been considered instead for the actual DDJ prediction [ 10 – 14 ]. So, the calculated DDJ always underestimates the real DDJ and the prediction accuracy may degrade as the bit rate increases relatively to the system bandwidth.…”