FET Technology and Application: An Introduction

In 1975 there was little excitement in discrete silicon field-effect transistors (FETs). At best the market was considered to be "mature." The few manufacturers who maintained
a presence in the field found their market share growing only as competitors dropped out. On the surface, the discrete FET appeared to be sliding into obscurity simply because few graduating engineers who were entering industry had studied the technology; hence, because of their lack of familiarity, they were unaware of its potential.
If we had reviewed the commercially available discrete FET technology of that day (remembering that we are focusing on discrete silicon FETs, not gallium arsenide FETs),
we would have fourtd the junction FET (JFET) and two types of MOSFET-the classic planar type and a newer type of metal-oxide semi-conductor called double-diffused, or
DMOS.