E.V. Egorov1, S.B. Makarov2, V.M. Malyshev3

1 STC, Ltd. Special Technology Center (St. Petersburg, Russia)

2,3 Peter The Great St. Petersburg Polytechnic University (Saint-Petersburg, Russia)

This paper presents the model and the experimental sample of 10 GHz low-phase noise reference oscillator with electrical and mechanical tuning. The article is divided into five sections. I the first section, introduction, the relevance of the work is described and the parameters of mass-produced dielectric resonator oscillators are given. The development of reference oscillators with a low PN level is relevant for radio engineering systems, especially in measuring instruments.  In the second part, the basic design principles of lownoise microwave oscillators are described. Among the main ones, one can single out the development of a high-quality resonant system, a low-noise amplifier and the selection of the optimal operating mode of the oscillator to obtain a minimum PN level. In the third part, a method for modeling a resonant system with mechanical and electrical frequency tuning based on a dielectric resonator is considered. An experimental sample of a DR with a Q-factor of more than 20,000 was used in the work. The loaded Q-factor of the resulting resonant system layout is more than 7000 with losses of less than 8dB in the entire electrical adjustment range. The fourth part describes the development of LNA on SiGe-transistors. A two-stage LNA was built with gain more than 18 dB at an operating frequency of 10 GHz. The PN level, Gain, P1db of the design almost completely coincide with the developed model. The last part describes the model and experimental design of the resulting reference generator. The generator operates near the frequency of 10 GHz. The obtained PN level is not less than -122 dBc/Hz at 10 kHz frequency offset in the entire range of electrical tuning. At the same time, the output power is more than +2.5 dBm. The described technique makes it possible to design low-noise reference oscillators for different frequency ranges.

Egorov E.V., Makarov S.B., Malyshev V.M. Ultra-low-noise X-band reference oscillator based dielectric resonator. Radiotekhnika. 2021. V. 85. № 12. P. 103−115. DOI: https://doi.org/10.18127/j00338486-202112-09 (In Russian)

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