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This paper reports the realization of a 5 MHz frequency difference x10pre-multiplier, developed in the laboratory to replace an obsolete one. Theprinciple we chose is to synthesize a 45 MHz and a 50 MHz from a referencesignal and from the signal to be measured, and to subtract one to the other togenerate a 5 MHz, whose precision on the measurement is increased by a factor10. Obtained Allan variance &#61555;y(&#61556;) at 1 s is 5.10-14 and outputspectral density of phase noise floor is about -160 dBc/Hz at 5 MHz.

Development of a 5 MHz frequency difference pre-multiplier for a short term frequency stability bench of the oscillators