High-speed add-compare-select units using locally self-resetting CMOS

This paper presents a new self-resetting CMOS design for an add-compare-select (ACS) unit, which is a key building block in a Viterbi decoder. Static CMOS and two-phase domino CMOS designs have also been implemented for comparison purposes. The simulation results show that, with the SRCMOS technique, the ACS units operate at a data rate of 568 Mbps in a 0.25 micron CMOS technology, as compared to 357 Mbps and 485 Mbps for static and domino CMOS implementations, respectively.