A low power high-speed 8-bit pipelining CLA design using dual-threshold voltage domino logic

Authors:
Chua-Chin Wang;Chi-Chun Huang;Ching-Li Lee;Tsai-Wen Cheng
Affiliations:
Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan, R.O.C.;Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan, R.O.C.;Department of Electronic Engineering, Kao Yuan University, Kaohsiung, Taiwan, R.O.C.;Asuka Semiconductor Inc., Hsin-Chu, Taiwan, R.O.C.
Venue:
IEEE Transactions on Very Large Scale Integration (VLSI) Systems
Year:
2008

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Abstract

A high speed and low power 8-bit carry-lookahead adder using two-phase modified dual-threshold voltage (dual-Vt) domino logic blocks which are arranged in a programmable logical array-like design style with pipelining is presented. The modified domino logic circuits employ dual-Vt transistors and reversed bulk-source biases for reducing subthreshold leakage current when advanced deep submicrometer process is used. Moreover, an nMOS transistor is inserted in the discharging path of the output inverter such that the modified domino logic can be properly applied in a pipeline structure to reduce the power consumption. The addition of two 8-bit binary operands is executed in two cycles. Not only is it proven to be also suitable for long adders, the dynamic power consumption is also drastically reduced by more than 10% by the measurement results on silicon.