Compact models and computation of crosstalk for sub-threshold interconnect circuits

In this paper, an analytical framework to model crosstalk in sub-threshold regime of buffer driven coupled interconnects has been presented. Sub-threshold current model is used to represent the transistor. Propagation delay and timing are determined for the conditions when inputs to the coupled interconnect are switching in-phase and out-of-phase. Analytical expressions governing peak noise have also been presented. A comparative analysis of the analytical results with SPICE simulations shows that the proposed models capture waveform shape, propagation delay, timing and noise peaks with good accuracy. It is also analyzed that crosstalk is influenced by variation in the interconnect parameters namely length, width, adjacent spacing and buffer size.