A CMOS current-mode full-adder cell for multi-valued logic VLSI
Barton, Robert James
Fouts, Douglas J.
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This thesis describes the design and implementation of a carry save adder cell for multivalued logic VLSI. A four valued system was chosen and the logic was analyzed and minimized using the HAMLET CAD tool. SPICE was used to design and simulate the required behavior of the current mode CMOS circuits. A VLSI test and evaluation integrated circuit was implemented with MAGIC and fabricated through the MOSIS service. The completed IC was tested and evaluated using a specially designed binary to multivalued logic converter and decoder. Engineering modifcations to the original current mode inverter cells used by HAMLET were made leading to significant power savings in a complete design. The fabricated device performed as predicted by SPICE simulation. Exhaustive functional testing produced correct steady-state output signals for all cases of input loadings. Finally, we show HAMLET minimization heuristics are not efficient in the design of adder cells by comparison with an alternative modulo 4 carry save adder cell in current mode CMOS.
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