This document provides an introduction to VLSI (Very Large Scale Integration) and key concepts in computer-aided design of integrated circuits. It discusses how the number of transistors on chips has grown exponentially from just two transistors in the first integrated circuit in 1958 to billions of transistors in modern chips. It also summarizes different levels of integration from SSI to VLSI and how CMOS transistors work and have been scaled down in size over time from 10 micrometers to 0.18 micrometers.

1. Introduction to VLSI