Patent ID: 6593920
Filing Date: 2003-07-15
Classification: G09G,H03K

Abstract:
A level converter circuit comprising:an input terminal adapted to be supplied with a signal swinging from a first voltage to a second voltage lower than said first voltage; a first transistor having a gate electrode connected to said input terminal, and a source electrode connected to ground potential; a second transistor having a gate electrode connected to a drain electrode of said first transistor, a source electrode connected to a supply voltage, and a drain electrode connected to an output terminal; a load circuit connected between said gate electrode of said second transistor and said supply voltage; a third transistor having a source electrode connected to said input terminal, a drain electrode connected to said output terminal, and a gate electrode supplied with a DC voltage higher than said second voltage and lower than said first voltage, wherein said level converter circuit outputs a third voltage higher than said second voltage when said input terminal is supplied with said first voltage, and said level converter circuit outputs said second voltage when said input terminal is supplied with said second voltage.