When a jitter number is specified without an associated bandwidth, what bandwidth should be assumed?
Jitter is a time domain phenomenon which is the result of all the noise which affects the node of interest. This noise is usually assumed to be random noise, which is broadband in nature, although narrowband spurs and noise can certainly contribute to jitter. The most natural bandwidth is the actual bandwidth of sensitivity of the node where the jitter is of concern – such as at the encode node of an ADC. This bandwidth is not always known in practice. So, when a measurement of jitter is made it is referred to as a “broadband” measurement. That is, all of the broadband noise which affects the node is accounted for in the measured jitter it has not been limited by an intentional filter.
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