Internal voltage generators are provided, as well as methods of
overdriving an internal voltage generation circuit. Embodiments of the
internal voltage generator comprise a first driver for receiving an
external voltage to supply an internal voltage to the internal circuit in
response to an input voltage; a comparator for comparing a reference
voltage with a fed-back internal voltage to generate the input voltage of
the first driver; a variable pulse generating circuit responsive to an
input pulse; and a second driver for dropping the input voltage of the
first driver to a ground voltage in response to the variable pulse
produced by the variable pulse generating circuit. The internal voltage
generator can generate the internal voltage of a relatively constant
level without regard to increase of the external voltage or frequency of
an operating signal.