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Very high frequency and microwave interferometric phase and amplitude noise measurements

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3 Author(s)
Rubiola, E. ; Politecnico di Torino, Dipartimento di Elettronica, c.so Duca degli Abruzzi No. 24, I-10129, and INFM, Unit\á del Politecnico di Torino, Torino, Italy ; Giordano, V. ; Groslambert, J.

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The interferometric technique allows close-to-the-carrier measurements of both phase and amplitude noise, improving the instrument noise floor by 10–25 dB as compared to the traditional method based on a saturated mixer. Principles and basic equations describing the noise measurement system are given, together with design strategies suitable to microwave and very high frequency bands. Two prototypes, operating at 9 GHz and 100 MHz are discussed in detail. The relevant features of these prototypes are the capability to operate in a wide power range, below 0 dBm and above 20 dBm, and low noise floor. The latter is about -180 dBrad2/Hz (white) and 150 dBrad2/Hz (flicker) at 1 Hz Fourier frequency, at carrier power from 9 to 15 dBm. © 1999 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:70 ,  Issue: 1 )