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Design >> RF Design >> noise of VCO
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Message started by pppp on May 6^th, 2005, 11:20am

Title: noise of VCO
Post by pppp on May 6^th, 2005, 11:20am

I am running pnoise on a VCO. Could some one tell me the result is in single-side or double-side means?

Thanks a lot.

Title: Re: noise of VCO
Post by pancho_hideboo on May 8^th, 2005, 8:28am

It is SSB-Phase Noise.

Although you can extend a sweep frequency from negative to positive like following, the result is SSB-phase noise

pnoise ( Vout 0 ) pnoise sweeptype=relative relharmnum=1
+ start=-100 stop=100 step=5 maxsideband=15 iprobe=V0
+ refsideband=1 noisetype=sources annotate=status save=allpub
+ saveallsidebands=yes

Title: Re: noise of VCO
Post by pppp on May 9^th, 2005, 12:09pm

Thank you very very much. It seems I gained 3dB here since negtive sideband noise is already folded.