ring oscillator output parasitic capacitance approximation

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engrMunna

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Hi.
I am simulating a cmos ring oscillator at the schematic level. I want to simulate it with some "interconnect parasitic capacitance" at the output of each inverter. What do you think can be an approximate value of this capacitance that I need to put at the output of each inverter so that when I do the layout, there is not very much difference in the between the schematic and layout simulation results. I am working in UMC 180nm Tehcnology. Is 10femtoF a reasonable choice? Since this will be my first layout ever I don't know much about it. PLease help
 

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