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How to measure the frequency differential ring oscillator

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peter200583

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Hi, everyone. I have used cadence spectre to measure the frequency of differential ring oscillator, but there is a problem, I set vc to control the output frequency, but the simulation result of both vo is constant(see blow). I hope that someone could solve this problem
difrroscfullst outcome.PNGdifrroscfullst schematic.PNGdifrroscfullst WL.PNG
 

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