The various design limitations imposed on RSFQ circuits through synchronous clocking schemes, make the use of asynchronous clocking attractive. This paper critically reviews and compares a wide range of asynchronous methodologies that have thus far been proposed in the published literature. Circuits are optimized using a Genetic Algorithm optimizer and are then compared in terms of yield, critical margins and latency. A full-adder is also designed and simulated for each methodology to obtain information regarding implementation above the primitive cell level.
展开▼
