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https://designers-guide.org/forum/YaBB.pl Design >> RF Design >> how to distinguish frac spur and ref harmonic https://designers-guide.org/forum/YaBB.pl?num=1104115595 Message started by liliwang on Dec 26th, 2004, 6:46pm |
Title: how to distinguish frac spur and ref harmonic Post by liliwang on Dec 26th, 2004, 6:46pm In a frac-N pll using 2rd orfer sigma-delta, when there is a strong spur neer carrier, how to distinguish it is a fractional spur or just reference harmonic. What's the cause of reference harmonic, and how to reduce it. |
Title: Re: how to distinguish frac spur and ref harmonic Post by DaveB on Jan 5th, 2005, 7:52pm If it's at the reference frequency that's a strong hint. If you change channels and the spur stays at the same frequency offset, then it's likely a reference spur. If you change frequencies, and the spurious offset changes, then I'd suspect some sort of fractional spur. Dave |
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