A novel low-power building block CMOS cell for adders

A new low-power, high-speed CMOS 1-bit full adder cell is presented. It is based on recent designs of XOR and XNOR gates, and pass-transistors, it has 16 transistors. This cell has been compared to two widely used efficient adder cells; the transmission function full adder cell (16 transistors), and the low power adder cell (14 transistors). The new cell has no short circuit power and lower dynamic power, because of less number and magnitude of circuit capacitances. It consumes up to 21% less power than the other two cells, while it is 12% to 20% faster. A comparative analysis (using Magic and Hspice) for 8-bit ripple-carry and carry-select adders shows that the adders based on the new cell can save up to 29% of power consumption