DOI 10.17586/0021-3454-2016-59-2-150-158
UDC 621.391
MODELLING THE DIGITAL-TO-ANALOG FREQUENCY CONVERTER IN THE VERNIER FEEDBACK PATH OF SELF-OFFSET PHASE-LOCKED LOOP WITH MULTIPLICATION
Radio Research Institute, St. Petersburg Branch — LONIIR; Senior Scientist
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Abstract. One of solutions to the problem of improvement of spectral composition of output oscillation of selfoffset phase-locked loop with multiplication implies a variation in feedback path structure. The Vernier feedback path makes it possible to diminish significantly the phase noise level in the self-offset phaselocked loop pass band (in the vicinity of carrying oscillation) while maintaining the specified loop multiplication factor. Analysis of noise filtering is carried out, and modelling in Fastmean 6 environment is performed for digital-to-analog frequency converter in the Vernier feedback path. The resulting oscillations spectra are presented. Recommendations on the method applications are formulated.
Keywords: pulse counter, feedback path, Vernier, self-offset phase-locked loop
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