I have done a circuit using cascaded RC networks (like a Elmore delay model) and at each point it has 1 ps delay. The circuit has, say, 100 RC networks, giving a total delay of 100 ps.
Now, due to process variations and mismatch in the RC values, the delay may change.
So what do I do? Suppose the actual overall delay is 105 ps, then should I consider that each RC network has a delay of 1.05 ps?
I was thinking like breaking the circuit into parts and measuring the delay of each part of the circuit. Like, if I break the circuit into 4 parts, and, say, the delays are 25 ps, 27 ps, 25 ps, 28 ps, Then, should I take the mean average or rms average of these values? If I take rms average, then into how many parts should the circuit broken?

Hello Raj,
I have to use the several RC networks. I want to find out how should I represent the delay of each RC network considering the overall delay of the entire network.
So, if the overall delay is 105 ps should I consider each element has a delay of 1.05 ps?
Or, should I break the complete RC network into equal/unequal parts and calculate the delay of each network using frequency distribution method?

I need to delay a waveform by certain ps. Maximum delay can be 100 ps. Minimum I am considering 1 ps as below that the RC values are becoming very low. So I need to find out the average delay generated by each RC network.