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The Designer's Guide Community Forum › Simulators › RF Simulators › ring VCO phase noise is positive
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ring VCO phase noise is positive (Read 1899 times)
880321
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ring VCO phase noise is positive
Dec 12th, 2012, 7:57pm  
I run the PSS+Pnoise sim using spectreRF for a ring vco, I found that the phase is positive @ low offset,eg 100Hz
phase noise:
20dBc/Hz@10Hz
-70dBc/Hz@100KHz
but L(f)=10log(Pn/Ps), how could this be positive?

Best regards
haitao
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Ken Kundert
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Re: ring VCO phase noise is positive
Reply #1 - Dec 12th, 2012, 8:48pm  
Check out page 31 in An Introduction to Cyclostationary Noise.

-Ken
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