CMOS charge pump circuits are used to provide different voltage level on single chip to operate different circuits on the chip itself. Four stage charge pump circuit is presented in this paper. Also output of all the stages can be taken simultaneously to drive any other circuit on same chip. In our research by optimizing W/L ratio of all the transistors, silicon area utilized by the circuit is reduced to a great extent while maintaining satisfactory speed of operation of the circuit as well as comparatively low ripples at output.