Ⅰ. Peaking value jitter, root mean square jitter
The most commonly used methods for quantifying Jitter over the years are peaking to Peak Jitter and root-mean-square Jitter.However, due to the existence of random jitter and non-fixed jitter, the peak and peak values of jitter increase as the number of observed samples increases. Therefore, it is very effective to use the peak and peak jitter parameters to measure the natural jitter, but there will be a large error in measuring the random jitter.In the same way, due to the existence of intrinsic dithering and non-gaussian dithering and noise, the histogram or distribution diagram of dithering does not show a complete gaussian distribution. Therefore, the statistical value of 1 sigma or RMS of dithering is not equal to the value of the real gaussian distribution.
Peaking jitter and root-mean-square jitter are statistical analysis indexes for a certain kind of jitter.
Ⅱ. Phase jitter, periodic jitter, jitter during adjacent cycles
As the clock system is a very critical part of the digital circuit system, which directly determines the success or failure of data signal transmission and reception, and is the aorta of the whole system, the jitter of the clock has always attracted much attention.Jitter parameters describing clock systems are generally divided into three categories, namely Phase jitter, Period jitter and Cycle to Cycle jitter.
In digital systems, switching between the two logic level is usually accompanied by a quick along the emergence of the instability of the edge on the time sequence is called phase jitter (phase jitter, sometimes also called accumulated jitter, accumulated jitter, refers to the actual edge position with the ideal edge position deviation, in time, can also be converted to radians, Angle, etc.);Phase jitter is the equivalent representation of phase noise in digital domain. It is a discrete quantity, so it is only defined when edge exists.
The ideal edge position is generally defined at an integer multiple of the bit-time interval of the digital signal.