What is the recommended capacitor value for AC coupling between the LTC6954-3 buffer and the ADF4377 PLL, and is there a difference in performance between 1uF and 0.1uF capacitors?

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Either a 1uF or 0.1uF capacitor will work for AC coupling between the LTC6954-3 buffer and the ADF4377 PLL. The 1uF capacitor provides marginally better 1/f noise, but the difference in phase noise performance below 1kHz is minimal and may not be noticeable in most cases. For the input interface of the LTC6954-3, a 1uF capacitor is also recommended to potentially achieve the best 1/f noise performance.

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LTC6954 : FAQ