2.1 The Search for a Better Switch
A basic element in digital logic is a switch or an inverter comprising a pair of complementary metal oxide semiconductor (CMOS) nanotransistors (Figure 2.1a) whose resistances and change in a complementary manner in response to the input voltage Vin. As Vin changes from 0 to VDD, the resistance of the “NMOS” transistor gets smaller while the resistance of the “PMOS” transistor gets larger making the output voltage
change from VDD to 0 as shown in Figure 2.1b so that the output represents an inverted version of the input.
For some time now it has been recognized ...