Design and simulation a comparator with high speed and low power

This paper presented a comparator with high speed and rail-to-rail input for low voltage and low power applications such as ADCs.in this circuit used PMOS transistors for input comparator Simulations are done in the 0.18%m CMOS technology with a supply voltage fo 0.5V in clock freuency of 2.5MHZ .the power dissipation is 8nw and propagation delay time is 24.8ns.