IEEE 2414-2020 pdf download
IEEE 2414-2020 pdf download.IEEE Standard Jitter and Phase Noise.
DDJ usually originates from the following sources (see Moreira and Werkrnann [B21]) and Renesas Electronics Corporation [B24]):
— Intcr symbol interference (ISI).
When IS! is present, amplitude variations in the waveform for a given UI may be introduced by waveform features (such as a slow settling after a waveform transition) and aberrations that have occurred in previous Uls. This will advance or delay the signal transition instants throught a reference level with respect to an ISI-free scenario, thus introducing jitter that depends on the transmitted data pattern (Renesas Electronics Corporation [B24]). For example, transmitting the sequence 00100111 may generate DDJ that is different from that when the sequence 1001001 is transmitted (JESD2O4B.01 [815]). ISI has four main causes:
Limited analog bandwidth of the communication channel, which changes the profile of the transmitted or received signal depending on the signal’s analog bandwidth, with the result that the state levels associated with a given bit are influenced by the preceding bits.
— Nonlinear phase response of the communication channel causes frequency-dependent group delays, which alters the relative phase of the communication signal’s spectrum. This will cause changes in the transistion durations and reference instants for the pulses in the communication signal and is dependent on the transition density of the communication signal. Reflections due to possible impedance mismatch along transmission lines, at transmission line junctions. or at transmission line terminations.
Frequency-dependent skin effect and dielectric losses of the transmission lines that extend the
transition duration and decrease the amplitude of the propagating pulses in the data signal.
— Duty cycle distortion (DCD). DCD is caused by a time difference between the positive-going and the negative-going transitions of the signal of interest. As a consequence, the time interval between positive-going transitions and subsequent negative-going transitions is different than the time interval between negative-going transitions and subsequent positive-going ones. The difference between these two intervals and the nominal UI gives rise to a two-valued jitter sequence. Additional DCD sources are an inaccurate setting of the threshold level, or an offset affecting the signal amplitude.
While TIE is defined according to a single type of event (e.g., positive-going or negative-going transitions of a signal), DCD explicitly depends on the relationship between two different specific events: the positive- going and negative-going transitions of a two-level signal. Therefore, DCD will be related to TIE if the two transitions are given their own T1E values, respectively. As such, the DCD is given in Equation (9):
This dominance of two reference instant deviations occurs, for example, if DCD prevails over IS! contributions and/or if the signal exhibits a clock-like periodic or quasi-periodic pattern. Model (11) is also commonly used for high probability jitter (HPJ) (IA OIF-CEI-03.O-201 1 [B6fl, which is loosely defined in telecommunications as the “jitter that reaches its peak value when several thousand bits are transferred across the link” (Wood, Ferguson, and Evangelista [832]). Moreover, Equation (11) is commonly used for jitter estimation (see Renesas Electronics Corporation [B24j and Kim, Kim, and Lombardi [B 16]).
3.6.2 Periodic jitter (PJ)
Periodic jitter (PJ) will be either correlated or uncorrelated to the signal of interest, depending on whether the PJ source is caused by the signal itself or not. A distinctive feature of the PJ is the presence of one or multiple identifiable peaks in the spectral density. If the PJ exhibits a periodic pattern at a rate which is an integer or rational submultiple of the signal rate, then it will be referred to as sub-rate jitter (SRJ).
PJ is not to be confused with period jitter, which is defined in 3.3.
