An asynchronous add-compare-select design in CMOS VLSI

A novel asynchronous ACS (Add-Compare-Select) is described. The circuit of a novel asynchronous comparator unit is proposed. The performance of ACS is analyzed with the novel method based on multi-delay model. The results of performance analysis of asynchronous ACS show that the average case response time 3.66ns is only 45% the worst-case response time 8.1ns. It reveals that the asynchronous ACS has some performance advantages than the synchronous one.