CMOS Analog Integrated Circuits

2

MOS Transistors

CONTENTS

2.1    Transistor structure

2.1.1    I/V characteristics of MOS transistors

2.1.2    Drain current in the strong inversion approximation

2.1.3    Drain current in the subthreshold region

2.1.4    MOS transistor capacitances

2.1.5    Scaling effects on MOS transistors

2.2    Transistor SPICE models

2.2.1    Electrical characteristics

2.2.2    Temperature effects

2.2.3    Noise models

2.3    Summary

2.4    Circuit design assessment

In almost all modern electronic circuits, transistors are the key active element. By reducing the dimensions of MOS transistors and the wires connecting them in integrated circuits (ICs), it has been possible to increase the density and complexity of integrated systems. Figure 2.1 illustrates ...