Comprehensive Comparison of NULL Convention Logic Threshold Gate Implementations

摘要

Asynchronous circuits offer many advantages including no clock, reliable operation, flexible timing requirement, and low electro-magnetic interference. NULL Convention Logic (NCL), as a popular quasi-delay-insensitive asynchronous design paradigm, incorporates threshold gates as its logic family. The implementations of these gates directly impact the performance of NCL circuits. This paper features eight NCL implementations published in literature and compares them across various metrics. The results and analysis can be used by designers for selecting the most appropriate design for their specific applications.