I saw a few posts asking about the tuning port BW of various VCOs, so I figured I'd ask what its importance was regarding loop filter design.
Your question isn't clear to me. If your inquiring about what we would refer to as modulation bandwidth where the Vtune port is modulated there are a couple of things to watch for. The magnitude of the input capacitance of the tune port of the VCO would impact the modulation bandwidth (inversely proportional) and it also serves as the last pole in your loop filter so must be included in your loop design. The modulation BW could be limited by the phase / frequency settling time of your loop so you need to be sure the loop is sufficiently wide to make sure that isn't the case.
If by chance you're referring to the tuning sensitivity (Kv) or how fast the frequency changes with respect to a change in tuning voltage, this has a significant impact on the loop filter. It impacts the values that will be ultimately be derived for a given loop bandwidth as well as the location of the 3dB corner of the loop as the frequency is varied (and Kv varies with frequency).
Thank you for responding so quickly. I was referring to the first thing you mentioned: the modulation bandwidth. I think your answer is exactly what I needed.
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