Short-term Frequency Stability Domain Measurement Methods And Realization

Nowadays, for the development of the communication technology, high precision measurement of the nonstandard signal were needed in very wide frequency spectrum. But it was a contradiction between the high precision and the cost of instrument, so the instruments of high precision, low cost and simple structure were very popular. The aim of us is to work over this system accord the above, the short-term frequency stability measurement system accord with high precision, simple structure, low cost and convenient to use.Research had been done in this article:First, the output noise model of frequency source and its behave form had been instructed; the physical meaning of the short-term frequency stability and its performance in the time domain and frequency domain. Then the measurement method, main the frequency difference period measurement, the frequency difference multiply measurement had been instructed.Second, an example of given target which use the frequency difference multiply measurement had been performed. This project contains three main parts: the part of frequency produce, the part of frequency difference multiplier, the part of frequency mix and modulation. The circuits had been realized and the precision achieve 10 ?1 3/sin time domain. Then the noise performance had been discussed in this article. Third, because of the shortage of the project mentioned above, a new realization, the double mixer time difference measurement had been brought forward. The measurement theory and the noise performance had been discussed. The circuit and the software had been realized.Last, the two realization had been summarized and these application range had been discussed.