Abstract: This paper discusses a comparative study of combinational circuits with different logic style of designing. Logic style affects the switching capacitance, transition activity, power, delay. Various logic styles have been compared and taking AND, OR, XOR and FA as reference circuit. Different logic styles are compared with respect to transistor count, power dissipation and delay in 250nm technology. It is observed that less power is consumed in the m-GDI than the other logic styles.

Keywords: Complementary CMOS, GDI, M-GDI technique, low power, high speed, transistor count.