A new 4-2 adder and booth selector for low power MAC unit

The integration level of VLSI system increases as the technology improves. The power dissipation of the data processing unit in the digital signal processing systems must be kept as low as possible. Thus, we newly designed a 4-2 adder and a booth selector by using transmission gate circuits to accomplish low power consumption without performance sacrifice. The proposed 4-2 adder consumes lower power than the conventional 4-2 adder by 16% and the proposed booth selector consumes less power than the conventional booth selector by 60%. We designed a 32-bit MAC unit with the proposed 4-2 adder and the booth selector. The power dissipation of the 32-bit MAC unit is 124 mW at 100 MHz with 2 V power supply, with the area of 1.3 mm/spl times/2.4 mm.