With a zener diode, we can build simple voltage regulators. Now, we
want to discuss the use of negative feedback to improve voltage
regulation. The discussion begins with linear regulators, the kind in
which the regulating device is operating in the linear region. We will
discuss two types of linear regulators: the shunt type and the series
type. This chapter concludes with switching regulators, the type in
which the regulating device switches on and off to improve the power
efficiency.
