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Jitter period is the interval between two times of maximum effect (or minimum effect) of a signal characteristic that varies regularly with time. Jitter frequency, the more commonly quoted figure, is its inverse. ITU-T G.810 classifies deviation lower frequencies below 10 Hz as wander and higher frequencies at or above 10 Hz as jitter. [2]
It is then possible to measure the skew between the input trigger and the local clock and adjust the vernier delay on a shot-by-shot basis, to compensate for most of the trigger-to-clock jitter. Jitter in the tens of picoseconds RMS can be achieved with careful calibration. Stanford Research Systems use this technique.
Clock recovery addresses this problem by embedding clock information into the data stream, allowing the transmitter's clock timing to be determined. This normally takes the form of short signals inserted into the data that can be easily seen and then used in a phase-locked loop or similar adjustable oscillator to produce a local clock signal ...
This type of clock gating is race-condition-free and is preferred for FPGA designs. For FPGAs, every D-type flip-flop has an additional CE input signal. Clock gating works by taking the enable conditions attached to registers, and uses them to gate the clocks. A design must contain these enable conditions in order to use and benefit from clock ...
In addition to clock skew due to static differences in the clock latency from the clock source to each clocked register, no clock signal is perfectly periodic, so that the clock period or clock cycle time varies even at a single component, and this variation is known as clock jitter. At a particular point in a clock distribution network, jitter ...
This timing inaccuracy is referred to as jitter. A regenerator includes circuitry to recover the clock timing information, which is then used to determine when the output signal switches its state. This ensures that the recovered data from the threshold detector is adjusted to provide the correctly timed signal output.
The deserializer uses the reference clock to monitor the recovered clock from the bit stream. As the clock information is synthesized into the data bit stream, rather than explicitly embedding it, the serializer (transmitter) clock jitter tolerance is to 5–10 ps rms and the reference clock disparity at the deserializer is ±100 ppm.
PPS signals are used for precise timekeeping and time measurement. One increasingly common use is in computer timekeeping, including NTP.Because GPS is considered a stratum-0 source, a common use for the PPS signal is to connect it to a PC using a low-latency, low-jitter wire connection and allow a program to synchronize to it.