2What Constitutes a Nanoswitch? A Perspective

Supriyo Datta1, Vinh Quang Diep1, and Behtash Behin-Aein2

1Purdue University, USA

2GLOBALFOUNDRIES Inc., USA

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 img and img change in a complementary manner in response to the input voltage Vin. As Vin changes from 0 to VDD, the resistance img of the “NMOS” transistor gets smaller while the resistance img of the “PMOS” transistor gets larger making the output voltage

equation

change from VDD to 0 as shown in Figure 2.1b so that the output represents an inverted version of the input.

img

Figure 2.1 (a) CMOS inverter comprises an NMOS transistor (R1) and a PMOS transistor (R2). (b) Input–output characteristics of the inverter

For some time now it has been recognized ...

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