Abstract:
In the field of precise time-frequency measurement and control, high resolution, time-dead zone and frequency measurement without dead zone are very important. In this paper, a frequency measurement method without dead zone is proposed, which locks the phase of the frequency signal output by the frequency synthesizer on the measured signal. By detecting the change of phase difference between the measured signal and the DDS output frequency signal, the DDS frequency control register and the phase shift control register are changed to realize the phase tracking. The frequency of the measured signals is calculated according to the phase change rule of the two signals. The experimental results in this paper show that the method achieves a measuring stability of 10
-13
.
Keywords:
Without dead zone, Frequency measurement, Phase tracking, DDS.
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