Using Elmore delay approximation, Calculate worst case t_pdr and t_pdf for funct

Question

Using Elmore delay approximation, Calculate worst case t_pdr and t_pdf for function F = NOT(AB+CD) when it is driving 3 idential gates. Assume Mu_n =2Mu_p with nmos transistors being unit size and pmos transistors being twice as large as the nmos transistors. Assume each transistor diffusion region has its own separate capacitance. Assume equal capacitance for diffusion regions with and without contact. Assume diffusion capacitance eis equal gat ecapacitance. Assume in this process Tau = RC = 6ps. Compute numerical values for t_pdr and t_pdf

Explanation / Answer

Calculating the Elmore Delay:

The Elmore delay is a fitting metric for RC trees.

                                    N

Delay at node k= 0.69    Cj × Rjk

                                    j=1

where N = number of capacitive nodes in the network. where Rjk is the resistance of the portion of the (unique) path between the input and node j, that is common with the (unique) path between the input and node k, and Cj is the capacitance at node k

Calculating the Elmore Delay:

The Elmore delay is a fitting metric for RC trees.

                                    N

Delay at node k= 0.69    Cj × Rjk

                                    j=1

where N = number of capacitive nodes in the network. where Rjk is the resistance of the portion of the (unique) path between the input and node j, that is common with the (unique) path between the input and node k, and Cj is the capacitance at node k

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