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Ring oscillator as a test structure

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Prithvee

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Hi,

Can someone briefly explain me how the ring oscillator serves the function of a test structure in predicting the frequency of operation of a Chip?

Thanks.
 

typically a number of ring oscillator (RO) types are implemented in test chip: ROs with inverters, buffers, gates (nand, nor,...); RO with different fanouts (FO=1, FO=4,...). RO self oscillating frequency at different conditions (i.e. PVT) give a most timing information dealing with library characterization/verification.
 

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