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Automating FM Noise Measurements

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1 Author(s)

With the proliferation of spectrally pure RF sources the developers of RF test systems have been faced with the problem of verifying this spectral purity, particularly the FM-noise sideband power levels associated with these sources. The PLL discriminator is one possible solution; however, its major drawback is that is requires a frequency source with spectral purity characteristics which are better than the source to be measured. The delay-line discriminator technique is an alternate solution to the problem. The latter technique has been successfully implemented and integrated into an automatic test system; its success is measured not only by its demonstrated performance characteristics but also by its simplicity which ensures its reliability and ease of maintenance.

Published in:

IEEE Transactions on Instrumentation and Measurement  (Volume:26 ,  Issue: 3 )