A similar question has already been asked before: https://e2e.ti.com/support/clock-timing-group/clock-and-timing/f/clock-timing-forum/1028354/lmx2820-mux_out_doubler-issue-in-fast-vco-mode
No useful answer was given. So I am going to ask one more time:
Using Full assist VCO calibration, we are able to switch between frequencies in a few tens of microseconds for fundamental frequencies and below (f ≤ 11300 MHz). However, it seems that we cannot use the full assist mode in the doubler path i.e., f > 11300 MHz. The tracking filter needs to be calibrated as well, but not much information is given about the tracking filter in the datasheet. It is mentioned that "The calibration for this tunable filter is automatically triggered whenever the VCO calibration is done."
Is it possible to use the full assist VCO cal in the doubler path? If yes how?
Thanks.