FREQUENCY SYNTHESIZER Russian patent published in 2016 - IPC H03B21/02 

FIELD: radio engineering and communications.

SUBSTANCE: invention relates to radio engineering and can be used in synchronous systems of radio systems to form signals with low time discrete frequency tuning in wide range and minimized level side (parasitic) components in the spectrum of output oscillation. Frequency synthesizer contains calibration generator 1, frequency divider with fixed division factor 2, phase 3 and 4 synchronous detectors, 5 switch signal polarity, the first 6 and second 7 voltage comparators, pulse generator 8, line 9 timing delay, logical circuit "exclusive or" 10, dreversible counter 11, digital-to-analogue converter (DAC) 12, first adder 13, signal multiplier 14, integrator 15, tuned generator 16, frequency divider with variable division factor 17, phase changer 18 at π/2, unit 19 of installation and stabilization of loop amplification, scaling voltage divider 25, buffer register 26, unit to control synthesizer 27, and required connections between them.

EFFECT: invention is a complex (simultaneous) improvement of main parameters of frequency synthesizer, in particular, reducing of time of initial synchronization and discrete frequency adjustment during operation and minimizing the level of secondary (parasitic) components in the spectrum of output oscillation of frequency synthesizer.

1 cl, 2 dwg