Summary

• CMOS logic gates use P-type and N-type MOSFET.
• The logic gates in CMOS technology are very energy efficient since no currents flow in the switched states.
• Design of logic circuits can be done with the standard gates introduced here.
• That means, circuits do not need to be designed at the transistor level.
• It is possible to design circuits with very large numbers of logic gates and realize them on a single chip.
• With modern tools, it is not very difficult to design custom chips based on libraries of standard cells.
• Such custom circuits are called ASICs (application specific integrated circuits).