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Updated: Jul 2, 2026

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
Published on: December 22, 2015
100-MHz noise spectrometer
R Rzemien1, C K Iddings, W F Love
1Department of Physics and Astrophysics, University of Colorado, Boulder, Colorado 80309.
Abstract:
The design, construction, and performance of a 100-MHz noise spectrometer are described. Basically a 100-MHz bridge, this system uses the properties of a double balanced mixer to enable the experimenter to determine spectral densities of fluctuations in the real or imaginary parts of a sample impedance, as well as the real part of the cross-spectral density. Calibration circuits and techniques are described. The results of measurements on commercial 50-Omega terminators demonstrate fluctuations of both the real and the imaginary parts of the impedance and partial correlation between them.
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