DEVICE AND CIRCUIT LEVEL SIMULATION STUDY OF NOR GATE LOGIC FAMILIES DESIGNED USING NANO-MOSFETs

Abstract

The investigation of silicon-based nano-MOSFETs logic circuits is helpful to gain more comprehensive knowledge about nanoscale transistors. Therefore, a simulation study has been performed on four logic families of two inputs NOR gate logic circuits, namely (i) nano-CMOS NOR gate, (ii) nano-MOSFET loaded n-type nano-MOSFET NOR gate, (iii) 733.8 Ω resistive loaded nano-MOSFET NOR gate, and finally (iv) pseudo-n-type nano-MOSFET NOR gate. The nano-MOSFET technology node studied in this paper is 10 nm. Device simulation is done using an online NanoMOS simulator, whereas circuit simulation is carried out using freeware WinSpice. The main obstacle encountered during downscaling of nano-MOSFETs is low power dissipation and high-speed nano-MOSFET logic circuits. Correct logical NOR operation has been proven by observing simulated timing waveforms. Transient timing analysis on nano-MOSFET loaded n-type nano-MOSFET NOR gate has shown that propagation delays calculated from theory and simulation are 66% matched. From the analysis, this 10 nm nano-MOSFET NOR logic circuit design exhibit a dynamic power reduction of 148 times and a propagation delay improvement of 33 times when benchmarked against a typical 120 nm MOSFET logic circuit.
 Keywords: nano transistor, electrical characteristics, channel length, channel width, benchmarking, power, speed