Patent ID: 6426671
Filing Date: 2002-07-30
Classification: G05F,G11C,H01L

Abstract:
An internal voltage generating circuit comprising:a reference voltage generating circuit for generating a reference voltage; a comparator for comparing said reference voltage with a voltage on a first node to generate a signal indicating a result of comparison; a current drive transistor coupled to a first power source node, for flowing a current between said second node and said first power source node in accordance with the signal outputted from said comparator; an output circuit coupled between said current drive transistor and a second power source node, for converting the current flown by said current drive transistor into a voltage to generate a resultant voltage on said second node, said output circuit including a voltage drop element causing voltage drop between said second node and said first node; and a voltage compensation circuit according to a difference between a voltage on an internal voltage line and the voltage on said second node for causing a current flow between said internal voltage line and a third power source node, wherein said voltage drop element is a first diode-connected insulated gate field effect transistor; said voltage compensation circuit comprises a voltage difference detection element varying in conductance according to a difference between the voltage on said second node and the voltage on said internal voltage line, to detect said difference, a circuit for generating a voltage on an internal node according to the voltage difference detected by said voltage difference detection element, and a drive element according to the voltage on said internal node for causing a current flow between said internal voltage line and said third power supply node; and said voltage difference detection element is a second insulated gate field effect transistor being the same in conductivity type as said first insulated gate field effect transistor, and said second insulated gate field effect transistor operates in a source follower mode.