Analog-digital systems of phase-locked loop

Considered the system digital phase-locked loop with a frequency synthesizer (the reference signal generator), implemented by analog circuits phase-locked. In forming a reference signal in the frequency synthesizer is used vernier method, which reduces the discrete phase adjustment without increasing the frequency of the master oscillator and voltage controlled oscillator and substantially extend the frequency range of the system. The results of the analysis of quasicontinuous model of the main indicators of quality and results of mathematical modeling. Defined requirements for the parameters of system in order to ensure the specified quality.