need help in ring oscillator

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incol

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I am designing a ring oscillator with some inverters, but I find it has a big power supply noise, so how to reduce it, can I modify the circuit to vco? can you give me some circuits?
thanks!
 

you may seach some patents, there are many these solutions.
 

I think if you vary the power supply it will be like a VCO. For the noise, maybe you can add more capacitance to the power supply to attenuate the noise.
 

you can connect the ring oscillator through a NMOS to the power supply. By adjusting the gate volatge of the NMOS, you can control the frequency.

Surianova
 

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