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please help me... ring oscillator in hspice

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eunsicksea

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hi... i have big problem...
i have to design a sci based n-stage cmos ring oscillator.
Each inverter may have the same size of W/L. target duty ratio of Vx = 50% +/- 1% ring Ring oscillator output frequency f = 1 GHz when Vctrl=0V.
Trise/Tfall of Vx, Vy, Vz, & Vzb < 100ps
so i have tried to design oscillator...
but i dont know how to do that...
please help me...
just in oscillator let me know what to do...:cry:
 

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