Internal voltage generator

Abstract

An internal voltage generator is highly tolerant of electrical parameter changes of transistors occurring due to process deviation. The generator can produce an internal voltage within a short setup time when there is a significant difference between a voltage level of an internal voltage when power is initially supplied to the internal voltage generator and a voltage level of an internal voltage to be produced. In one embodiment, the internal voltage generator of the present invention includes a comparator block and an output driving block to produce an internal voltage. The internal voltage generator further includes a reference voltage generation block, which generates at least two reference voltages to be supplied to the comparator block, and an offset section control block, which supplies a control signal for optimizing an offset section, that is, a voltage difference between the reference voltages, to the reference voltage generation block. The internal voltage generator can further optionally include an auxiliary output driving block in addition to a main output driving block to reduce the setup time for which the internal voltage is produced when voltage is initially supplied and to reduce power consumption. The internal voltage generator further includes a first control signal generation block and a control block to control operations of the main and auxiliary output driving blocks.