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

This paper reports the realization of a 5 MHz frequency difference x10 pre-multiplier, developed in the laboratory to replace an obsolete one. The principle we chose is to synthesize a 45 MHz and a 50 MHz from a reference signal and from the signal to be measured, and to subtract one to the other to generate a 5 MHz, whose precision on the measurement is increased by a factor 10. Obtained Allan variance y() at 1 s is 5.10-14 and output spectral 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

Abstract-This paper reports the realization of a 5 MHz frequency difference x10 pre-multiplier, developed in the laboratory to replace an obsolete one. The principle we chose is to synthesize a 45 MHz and a 50 MHz from a reference signal and from the signal to be measured, and to subtract one to the other to generate a 5 MHz, whose precision on the measurement is increased by a factor 10. Obtained Allan variance σy(τ) at 1 s is 5.10 -14 and output spectral density of phase noise floor is about -160 dBc/Hz at 5 MHz

Realization of a phase noise measurement bench using cross correlation and double optical delay line

International audienceIn this paper are presented first results obtained with a phase noise measurement bench system operating in X-band, realized in our laboratory, using double optical delay line and cross correlation. Phase noise floor using a microwave sapphire oscillator is better than -160 dB.rad²/Hz at 10 kHz from the 10 GHz carrier, using a 2 km optical delay line