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I’m developing a resonant circuit with its resonance frequency around 3 GHz. I am able to modify this resonance frequency. Is it possible to track the frequency of resonance with a PLL like the MAX2871 or ADF4355? The MAX2871 datasheet provides a block diagram and a schematic that connects CP_OUT with TUNE through the loop filter. How would I connect the output of the resonator back into the PLL to let it lock on that resonance frequency?