Keyword: «frequency synthesizer»

The architecture of a frequency synthesizer with a parasitic frequency modulation auto compensation channel and a broadband parasitic phase modulation autocompensation channel is presented. The results of modeling the frequency compensation characteristics of the presented architecture when changing node parameters are analyzed.

Analytical expressions are obtained for the transient characteristics of the parasitic angular modulation (PАM) autocompensation channels of frequency synthesizers (FS) and partial dynamic characteristics are calculated. The dynamic characteristics of the PАM compensation channels were evaluated when the parameters of the MF nodes for aviation radio communications were changed

The conditions for the stability of the auto compensation channels of the parasitic angular modulation of the frequency synthesizer are determined. The areas of stable operation of the proposed broadband auto compensator architecture using Butterworth and Chebyshev filters of the second and third orders are analyzed.

The features of the construction of structures for the stabilization of a discrete set of frequencies based on the schemes of the phase-locked frequency ring (PLL) are considered. The requirements for frequency synthesizers based on PLL with a frequency-phase detector (FD) with charge pumping are analyzed. Analytical expressions for transfer functions and for static errors are obtained.

Functional models of frequency synthesizers with phase distortion auto compensation channels of a pulse-phase modulator (PPM) have been developed, the stability conditions of PPM phase distortion auto compensation channels included in the control circuit and in the feedback circuit of the pulse-phase fre-quency auto-tuning system (PPFAS), as well as in the feedback circuit of the PPFAS ring, have been analytically determined.