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  5. COMBINED SYNTHESIZERS OF SIGNALS ON BASIS TWOCIRCULAR PLL AND DDS

COMBINED SYNTHESIZERS OF SIGNALS ON BASIS TWOCIRCULAR PLL AND DDS

N.P. Kandyrin
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The article describes the operation of a combined synthesizer, on the basis of a direct digital synthesizer (DDS) and a tworing phase locked loop system (PLL). Expression is got for the model of spectral density of power of a phase noise of a combined synthesizer is gained. Results of modeling of noise performances of a combined synthesizer for various target frequencies (3 - 11 GHz) are resulted.
Keywords: combined synthesizer, PLL, DDS, noise characteristics, the phase noise