Estimation of Data-Dependent Jitter Using Single Pulse Analysis Method in High-Speed Differential Signaling

Timing margin in high-speed data channel becomes tighter as bit rate goes higher. Timing jitter pares down the timing margin and makes it difficult to set timing budget for the receiver to distinguish digital binaries. Especially, the timing jitter that is correlated with the bit sequence in a data stream is called data-dependent jitter (DDJ). DDJ rises up with higher bit rate in dispersive lossy channel, therefore the issues about DDJ are rising up in recent high-speed serial interface design. In this work, a simple analysis method for the estimation of DDJ in high-speed differential signaling using single bit pulse response is proposed. A frequency dependent model of a transmission line is considered to characterize lossy properties of the differential channel, and the single bit pulse response is obtained with the model. The estimated DDJ in the differential signaling is experimentally verified with jitter measurements