[time-nuts] DMTD mixer question

[Grant Hodgson]

Jim

Figures such as -200dBc/Hz probably relate to the phase noise figure of 
merit which some PLL suppliers like Nat. Semi, Hittite and AD use to 
compare various PLL offerings.  These figures are normalised to a 1Hz 
comparison frequency and unity division ratio; to get a prediction of 
PLL phase noise within the loop bandwidth you need to scale for both 
comparison frequency and division ratio.  This FOM is somewhat crude, as 
it doesn't take into account flicker noise, amongst other things, and 
loses accuracy with very high comparison frequencies.  Banerjee goes 
into more detail about this subject.

regards

Grant

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I seem to recall seeing a number like -190dBc/Hz or -200dBc/Hz for these 
hot stuff PFDs, but I can't recall where, maybe Banerjee's PLL book?

--snip--