Tuesday, 20 October 2015

Jitter

Jitter

The short-term variations of a signal with respect to its ideal position in time.
Jitter is the variation of the clock period from edge to edge. It can varry +/- jitter value.
From cycle to cycle the period and duty cycle can change slightly due to the clock generation circuitry. This can be modeled by adding uncertainty regions around the rising and falling edges of the clock waveform.

Sources of Jitter Common sources of jitter include:

Internal circuitry of the phase-locked loop (PLL)
Random thermal noise from a crystal
Other resonating devices
Random mechanical noise from crystal vibration
Signal transmitters
Traces and cables
Connectors
Receivers

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