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Phase noise measurements of low power signals

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4 Author(s)
E. Rubiola ; ESSTIN-LPMIA, Univ. Henri Poincare, Vandoeuvre les Nancy, France ; E. Salik ; Nan Yu ; L. Maleki

Measuring the phase fluctuation between a pair of low-power microwave signals, the signals must be amplified before detection. In such cases the phase noise of the amplifier pair is the main cause of 1/f residual noise. A new scheme is proposed that makes amplification possible while rejecting the 1/f (flicker) noise of the two amplifiers in real time. The first prototype, compared to a traditional saturated mixer system under the same conditions, shows a 24 dB noise reduction in the 1/f region.

Published in:

Electronics Letters  (Volume:39 ,  Issue: 19 )