Patent ID: 8811463

Claim:
A jitter measuring trigger generator which generates a trigger pulse for measuring a jitter included in a data signal to be measured, the jitter measuring trigger generator comprising: a phase adjuster which receives as an input a trigger clock synchronized with the data signal to be measured, and controls a phase of the trigger clock such that the trigger period of a high-speed sampling of the data signal to be measured becomes only one sample per bit of the data signal to be measured, thereby one sample is acquired for each bit of the data signal to be measured; and an adjustable frequency divider which is able to set a frequency division ratio such that the trigger pulse is generated at the fixed timing of a sample position serving as a point to be sampled in the waveform pattern of the data signal to be measured, wherein the jitter measuring trigger generator performs the high-speed sampling without being dependent on a length of the data signal to be measured.