A.N. Zikiy¹, A.S. Kochubey², A.V. Pomazanov³

¹‧²JSC "Taganrog Scientific Research Institute of Communications" (Taganrog, Rostov Region, Russia)

³Southern Federal University (Branch) (Taganrog, Rostov Region, Russia)

¹zikiy50@mail.ru, ²l.co4ubey@ya.ru, ³pav_tsure@mail.ru

An experimental study of a frequency synthesizer stabilized by a PLL ring has been conducted. The functional scheme of the frequency synthesizer, the methodology and the experimental results are presented. Problem statement. The spectral characteristics of the output signal of the frequency synthesizer have a significant effect on the output signals of the receiving and transmitting equipment. For small-sized mobile transmitting equipment, the parameters of the master generator are crucial in ensuring the main parameters: frequency, power, stability, and the level of parasitic components. The purpose of the work is to evaluate the parasitic parameters of the output signal of a frequency synthesizer experimentally. Results. The experimental results include the frequency run-out curve, the frequency dependence on the supply voltage, and the spectrum of the output signal in the near and far zones.

The following results are shown to be achieved: carrier frequency 2300 MHz; output power of at least minus 20 dBm; second harmonic suppression of at least 5 dB; load resistance of 50 ohms; frequency run-out within half an hour of no more than 14 kHz; frequency change when the supply voltage is changed from 8.5 to 9.5 V, no more than 52 Hz. Practical significance. The parasitic parameters of the frequency synthesizer investigated in the work made it possible to identify the influence of various factors on frequency stability, and make it possible to take measures to improve the parameters. For example, power supply voltage stabilization can significantly reduce frequency loss, as well as eliminate parasitic amplitude modulation from power supply ripples. In modern power supplies, ripples can be at a frequency of 100…200 kHz.

Zikiy A.N., Kochubey A.S., Pomazanov A.V. Decimeter wave frequency synthesizer. Radioengineering. 2025. V. 89. № 11. P. 193−197. DOI: https://doi.org/10.18127/j00338486-202511-24 (in Russian)

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