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csa ring oscillator design for help

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jodenma

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csa ring

now i need design one CMOS CSA ring oscillator,using 0.25um technology,VDD=2.5V, Vctr increase lined from 0.5v to 2v ,the output signal frequency should be 500Khz to 80Mhz,i should how to design this circuit.
now i design one initial circuit but when Vctrl from 0.5v to 2v the output frequency form 10mhz to 80mhz ,maybe i need to correct some circuit or parameter.
please give me some advice for this circuit ,thanks!
 

The Range is too large . 500K ~ 80Mhz , If you have do it for VCO , You can change the divider to fix this problem.
 

ye, i also think its a problom for design ,but now i must design this VCO ,and the output divider must set 1 at 500kHz input,so maybe i must change my structure of vco .
by the ways, for ring oscillator i dont know the functional inout voltage(vctrl) with output frequency, please help me,thanks!
 

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