The Designer's Guide Community Forum https://designers-guide.org/forum/YaBB.pl Measurements >> Phase Noise and Jitter Measurements >> Comparing phase noise at different fundamental frequencies https://designers-guide.org/forum/YaBB.pl?num=1499669373 Message started by deba on Jul 9th, 2017, 11:49pm

Title: Comparing phase noise at different fundamental frequencies Post by deba on Jul 9th, 2017, 11:49pm Hi, Lets say if there is a dBc/Hz(phase noise) profile available for an oscillator at 1 GHz. How does this translate to a phase noise profile at 100 MHz? Can one simply take the phase noise profile at 1 GHz and scale it up by 20*log10(100 MHz/1 GHz)? This will be true if 1 GHz is divided to 100 MHz. But lets say one achieves this by changing the components like tuning caps inside the oscillator to get the centre frequency from 1 GHz to 100 MHz. Will it still hold true? How does one compare the phase noise profile of two oscillator or signal generator at different fundamental frequencies?

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