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mtech vlsi phase noise project

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ppat2006

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hii,

i was trying to build 5 stage ring oscillator and then tried to do sst osc analysis but it gives error that circuit stable no oscillation frequency detected.

i m attaching screenshots of ckt diagram and error .Also it gives tht no waveform database file exists cannot evoke ezwave.
plz try to correct error in my design and tell me what values to be filled in sst osc and noise analysis dialog box
 

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