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This paper presents a comparative study of clock distribution methods for serial links, including inverter chain, CML chain, transmission line, inductive load and capacitively driven wires in regards to delay, jitter and power consumption. Analysis, simulation and design insights are given for each method for 2.5 GHz clock propagation by on-die 5 mm wire in a 90 nm CMOS process. Simulations show the transmission line achieves least jitter and delay, while capacitively driven wire illustrates the best power-jitter and power-delay product.
Date of Conference: 24-27 May 2009