There is a common core to the behaviour and technology of semi-conductor materials. Silicon and gallium arsenide are two materials particularly suited to Very Large Scale Integrated schemes (VLSI). Produced from a decade's worth of feedback from students and industry colleagues, this new edition integrates discussion of elemental (silicon) and compound (gallium arsenide) technologies. The book emphasizes fabrication principles for such circuits as CMOS, BiPolar, MOS and PET. These different technologies are introduced separately and then integrated into complete circuits.