Abstract: A circuit is disclosed for a complimentary metal oxide semiconductor (CMOS) operational amplifier output stage which can be connected easily to almost any input stage design and which can be coupled directly to that input stage. The circuit uses nine small transistors and two output transistors. The output transistors are connected in series between the power supply rails and the size of the two output transistors determines the current available to the load. The circuit of the invention can provide rail-to-rail output voltage swings and can drive a low ohm resistive load.