Phase-noise measurement with compensation for phase noise...

Pulse or digital communications – Testing

Reexamination Certificate

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C375S226000, C375S227000, C324S613000, C324S614000, C324S622000, C324S076190, C324S076220

Reexamination Certificate

active

07035324

ABSTRACT:
A method and apparatus compensates for phase noise added by a spectrum analyzer from phase noise measurements of a signal under test (SUT) taken by the spectrum analyzer. The method comprises the steps of measuring the phase noise of the SUT, determining the added phase noise of the spectrum analyzer, and applying a mathematical correction to the measured phase noise. A spectrum analyzer apparatus that compensates for added phase noise comprises a controller portion, a memory portion, a signal conversion and detection portion, and a compensation algorithm stored in the memory portion. A system that compensates for added phase noise comprises a controller having a control algorithm and a spectrum analyzer. The compensation and control algorithms are computer programs that implement the method of the present invention.

REFERENCES:
patent: 5337014 (1994-08-01), Najle et al.
patent: 6114858 (2000-09-01), Kasten
patent: 6246717 (2001-06-01), Chen et al.
patent: 6313619 (2001-11-01), Roth
patent: 6393372 (2002-05-01), Rzyski
Application Note 1EPAN 16E, Phase Noise measurements with Spectrum Analyzers of the FSE family, Oct. 2, 1995, Josef Wolf.
Phase Noise Measurements with Spectrum Analyzers of the FSE family, Application Note 1EPAN 16E, Oct. 2, 1995, Josef Wolf.
Mouthrup, Andrew A. and Muha, Michael S., Accurate Measurement of Signals Close to the Noise Floor of a Spectrum Analyzer, IEEE Transactions on Microwave Theory and Techniques, vol. 39, No. 11, Nov. 1991, p. 1882-1885.
Rhode & Schwarz Data Sheet for “Phase Noise Measurement Software FS-K4” for use with Spectrum Analyzer Models FSE/FSIQ/FSP/FSU.
Rhode & Schwarz help menus for using phase noise measurement software, Figs. 1-3, including “Making a Phase Noise Measurement”.

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