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Details of measuring τphlD. W. ParentIn Fig 6.6 the definition of τphl is somewhat misleadingτphlVdd/2In this figure it looks like τphl is measured from The point where Y starts to fall. It onlylooks this way because the rise time on A is so small that you can not see that you aresupposed to measure from 50% A to 50% Y.In this figure we can see the proper definition of propagation delay.50%VDD on input50% Vdd on outputτphlMeasuring delay between stages of an RO in a simulation (Where you have access to each node.)This is not realistic!VDD/2τphl τplhMeasuring average propagation delay realistically requires us to just measure the period of a signal.In this case if the ROhad three
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