hi wave3x,
what i meant to suggest is that the periodical refresh rate (and what happens within this cycle) isn't of a high spectral purity, so the spur @9kHz offset will look more like a wider hump.
yes "close-in" wasn't clear... given the loop bandwidth is likely to be quite narrow (7kHz ?) this 9kHz hump isn't quite in band, although remnants maybe.
sorry, force of habit of working with wider bandwidth plls means anything in kHz is close-in for me
my experience with boosted power supply chargepumps, is that the refresh rate was variable as it depended on the exact discharge characteristic, whcih was although dominately in terms of time constant by a decoupling capaictor (the 9kHz in this case). what happens in the boosted supply cycle is important on discharge and recharge (pump back-up up phase) and can cause poor phase noise, in this case as you rightly suggest, alot of this is out of the loop bandwidth.