what do you mean by vco has a linear tuning curve
Hi,Salem:
First of all,I think there is no problem of your simulated result.
But, in practice,Kvcomax:Kvcomin=10:1 is definitly not a good choice.It will cause the PLL bandwith to vary 10x.What is more,If you run full process corner simulation,the Kvcomax:Kvcomin will be even worse.
I think you should make your VCO run at the middle part of your F-V curve,this will reduce Kvcomax:Kvcomin to less than 2:1,which is a better choice.If the frequency range is not covered, you can use more VCO bands.
Remember:The linearer of KVCO,the easier the system design.
Best wishes!