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arxiv 2210.05764 v3 pith:ZCBE34BV submitted 2022-10-11 physics.ins-det hep-ex

A Sub-Picosecond Digital Clock Monitoring System

classification physics.ins-det hep-ex
keywords clocksystemchangesphasedigitalsmallsub-picosecondadding
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We describe a low-cost system designed to monitor wander in digital clocks with a precision of $\le$ 1 ps. With this system we have shown that it is possible to track phase variations at the sub-picosecond level by adding noise to a reference clock. As in many cases where a clock is part of a complex distribution network small changes in temperature and other effects can lead to small changes in the a clock's phase. As a further demonstration of the system, we have used it to measure the phase changes induced in optical signals in fibers.

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