Известия Томского политехнического университета: Инжиниринг георесурсов (May 2019)
Phase noise model considering spectral mask of frequency synthesizers and signal generators
Abstract
Relevance and the aim of the study. When developing the electronic devices it is important to calculate noise characteristics. While designing the communication systems the computation of receiving and transmitting tract is of particular importance to achieve a high signal/noise ratio at the output of the receiver/transmitter, which imposes restrictions on application of certain equipment. Phase noise is perhaps the most important criterion for generator and synthesizer stability. However, with a small difference in characteristics of phase noise power level, the price of the product may differ in several times. In this connection the compromise between the price and the quality of the specific equipment for the system being developed is important. To simplify the equipment selection it is necessary to develop an adequate mathematical model of phase noise considering spectral mask of frequency synthesizers and signal generators. Method of study. The progress in development of new electronic circuits conditions the necessity to use mathematics and software tools to assess properly the noise characteristics of the circuit. A common method of estimating the parameters of such a communication system is a simulation modeling, for example, in the platform «Matlab». For reliable assessment of phase noise impact on the system, it is sufficient to use the model, which allows taking into account the spectral power density mask in datasheet supplied by the manufacturer. Based on this model the feasibility of using device in the design can be concluded. In the paper the authors propose a method of phase noise mathematical modeling in the «Matlab» by the devicespecific characteristics provided by the manufacturers. Results and conclusions. The authors developed a mathematical model of phase noise with spectral mask of frequency synthesizers and signal generators, which adequacy was proved by the experiment.
