Patent ID: 6937088
Filing Date: 2005-08-30
Classification: G05F

Abstract:
1. A potential generating circuit which charging and discharging of an output node are performed in order that a potential at said output node becomes a potential corresponding to a reference potential, comprising: first transistor of a first conductive type, a first electrode of which is connected to a line at a first power supply potential, and a second electrode of which is connected to said output node; a second transistor of a second conductive type, a first electrode of which is connected to a line at a second power supply potential, and a second electrode of which is connected to said output node; a control potential generating circuit including: a third transistor of the second conductive type, a first electrode of which is connected to a first node, an input electrode of which is connected to ad output node, and a second electrode of which is connected to an input electrode of said first transistor; a fourth transistor of the first conductive type, a first electrode of which is connected to the line at said second power supply potential, an input electrode of which is connected to said output node, and a second electrode of which is connected to an input electrode of said second transistor; and first and second diode elements connected in series between said second electrodes of said third and fourth transistors, wherein said fist and second transistors are controlled in order that a potential at said output node coincides with a potential at a second node between said first and second diode elements; a monitor potential generating circuit including: a fifth transistor of the second conductive type, a first electrode of which is connected to said first node and an input electrode of which is connected to a third node; a sixth transistor of the first conductive type; a first electrode of which is connected to the line at said second power supply potential, and an input electrode of which is connected to said third node; a third diode element connected between a second electrode of said fifth transistor and said third node; and a fourth diode element connected between said third node and a second electrode of said sixth transistor, wherein a monitor potential is outputted from said third node; and a current supply circuit supplying a current to said first node in order that said monitor potential coincides with said reference potential.