PAM Jitter

PAM-4 J3u, J4u, J5u, J6u, J8u, Jrms, and even-odd jitter (EOJ) measurements can be made on PRBS13Q, PRBS9Q, PCIe JnU, PCIe Dual-Dirac, and other data patterns. These measurements are based on the IEEE 802.3 bs and other standards for Output Jitter measurements.

The PAM-4 Jitter measurement algorithm calculates thresholds for each of the 12 edges used. (The defined PAM measurement thresholds are not used for these measurements, and would not be useful, because eyes are frequently closed.)

During these measurements, a jitter histogram is measured for each of 12 specific waveform transitions that are called out in the standard as well as for the combined effect of all edge transitions.

On PAM-4 signals that are derived from two NRZ signals, these measurements let you observe the effect of different uncorrelated jitter on each stream based on the transitioning bits.