Patent ID: 7642843
Filing Date: 2010-01-05
Classification: G11C

Abstract:
1. A reference voltage generating circuit comprising: a monitor circuit including a series circuit of a first transistor of a first conductivity type, a second transistor of a second conductivity type and a resistor having a predetermined resistance, and including an output node extracted from one end of said series circuit; and an additional circuit including a third transistor of the first conductivity type and a fourth transistor of the second conductivity type, supplying a monitor current to said monitor circuit, and maintaining another end of said series circuit to a first substantially constant voltage which is not affected by a characteristic variation by production deviation, wherein a reference voltage outputted from said output node is corrected within a range corresponding to the production deviation of the first and second transistors from a predetermined center value, a threshold voltage of the first transistor is lower than a threshold voltage of the third transistor, and a threshold voltage of the second transistor is lower than a threshold voltage of the fourth transistor.