Question

D2 C2 A2 Segment 1 Segment 2 D1 A1 Segment1 Segment 2 C1 An 10X inverter at A drives an 10X inverter through wire "Segment" of length 1mm and width le- 3mm·The 8X inverter then drives an identical 10X inverter that then drives another 10X inverter through wire "Segment2" that has the same dimensions as "Segment The signal is part of a 2-bit bus. Both bus bits are identical in terms of their wire segments and the sizes of the inverters. The second bit flows from node A2 to node D2 and all the coupling capacitance is modeled as a coupling capacitance from node C2 to node C1. The value of the coupling capacitance is same as the input capacitance of a 2X inverter. Unit inverter has a drive resistance of 10kΩ Unit inverter has a gate load capacitance of 10fF Sheet resistance of the wire Ω Capacitance of the wire 100fF/mm. (a) Draw a single segment PI model of the wire segments. (2 point) (b) Estimate the driver resistance and loading for the 8X inverter. (2 point) (c) Replace the coupling capacitance by a capacitance to ground by estimating the value of this grounded capacitance. Provide justification for your calculations. Just writing out a formula/value for this capacitance will not fetch any points. (3 points) (d) Draw the RC network to estimate the delay for the first bus from the output of the first inverter to the input of the last inverter. (4 points) (e) Estimate the delay using Elmore delay model. (4 points)

Answer 1