A sub-picosecond digital clock monitoring system

Rohith Saradhy, Erich Frahm, Eduardo B.S. Mendes, Roger Rusack

Research output: Contribution to journalArticlepeer-review


We describe a low-cost system designed to monitor wander in digital clocks with a precision of ≤ 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 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.

Original languageEnglish (US)
Article numberT01003
JournalJournal of Instrumentation
Issue number1
StatePublished - Jan 1 2023

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  • Digital electronic circuits
  • Timing detectors


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