Problem in a ring VCO with cascode biasing

[liushangpiao]

Hi.all.
I am designing a ring VCO ( 3 invertors ) with cascode biasing.
I get the work frequency Fo=Ibias/(k*Vpp),k is a constant,Vpp is the output swing.Obviously ,the Fo relates to the Vpp,then I think in this case the amplitude modulation (also say AM-FM) is introduced,which will influence the performance of VCO(such as jitter, noise and so on)/.

So what should be considered when it is realized.

I am confused with it ,

Any reply is highly appreciated.

 

[kspalla]

VCO problem!!

AS mentioned "Fo=Ibias/(k*Vpp)". I has the dependency on Ibias, VPP, K factor etc.
SO identify the techniques to stabilize these parameters like current mirror etc.