In this work the study, design, development and experimental results of a new microwave\nexcitation signal generating circuit are presented. New design of this circuit is based\non the method of direct digital synthesis. The results of theoretical calculations and\nexperimental researches show that the new design not only has a high precision, but\nalso has an improvement in the spectral characteristics of the output signal. Range\nof generated output frequencies is expanded, that leads to the possibility of detuning\nthe frequency of the neighboring resonance of spectral line and adjust the C-field in\nquantum frequency standard. Experimental research of the metrological characteristics\nof the quantum frequency standard on the atoms of caesium with a new functional unit\nshowed an improvement in the daily frequency stability.
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