Inter-tier crosstalk noise on power delivery networks for 3-D ICs with inductively-coupled interconnects

Abstract

Inductive links have been proposed as an inter-tier interconnect solution for three-dimensional (3-D) integrated systems. Combined with signal multiplexing, inductive links achieve high communication bandwidth comparable to that of through silicon vias. However, being a wireless medium, electromagnetic coupling between the inductive link and nearby on-chip interconnects can cause voltage fluctuations affecting interconnect performance. Although the interference of interconnects on the operation of inductive links has been investigated, the inverse problem has yet to be explored. Consequently, this paper performs an investigation on the effect of electromagnetic coupling on different topologies of power delivery networks (PDNs) in the vicinity of on-chip inductors. Results indicate that the interdigitated PDN topology suffers from the induced noise due to the inductive links of the neighbouring tiers exhibiting a minimum aggregate noise of 131.3 mV. Alternatively, the paired topologies exhibit a superior noise behaviour, achieving a 39.4% and 35.4% decrease in noise level for paired type I and paired type II topologies, respectively, compared to the interdigitated topology.