Time delay, crosstalk and repeater insertion models for high performance SoC´s

Using a new physical model for the transient response of a distributed RLC interconnect with a capacitive load, novel compact expressions have been derived for: (1) the time delay, (2) the peak crosstalk for coupled lines, (3) the optimum number and size of repeaters, and (4) the time delay for repeater-inserted distributed RC and RLC lines. For practical ranges of line parameters, the maximum error between the compact models for time delay and crosstalk, and HSPICE simulations are 2% and 10% respectively. These new models are used to define a design space that illustrates a novel trade-off between number of repeaters and wire cross-section to achieve specified delay and crosstalk targets. For a 3 cm long interconnect, inserting 8 repeaters decreases peak crosstalk by 51% and wire cross sectional area by 83% without increasing the time delay, compared to a design without repeaters.