Abstract:

In order to solve measurement of transient noise and short-term stability of signals by conventional digital counting methods is not only difficult but also low in accuracy. So we introduce a novel phase coincidence detection technology which is an important detection method, and our group has worked on it for decades to measure the frequency source transient stability. According to the results of multiple phase coincidence detection circuits which are combined as a coincidence detection array, the detailed phase variation can be obtained. The measurement resolution depends on the stability of the coincidence detection circuit. In our experiment, the standard signal is a super-high stability crystal oscillator, measured signals are from the high stability crystal oscillator and OCXO whose parameters are significantly worse. Using the phase coincidence detection technique is able to properly reflect the actual stability situation. The measurement of transient stability of the frequency source plays an important part in the real-time short-term stability and the characterization of distal phase noise, so its accurate measurement is of great significance.

Key words: transient stability, threshold, phase coincidence detection