Patent ID: 8884680

Claim:
A signal electric potential conversion circuit, comprising: a capacitor having one end receiving an input signal, and having the other end connected to a termination node; and a termination circuit configured to receive a potential of the termination node, wherein the termination circuit includes: a first connection element provided between a first power supply and the termination node, and a second connection element provided between the termination node and a second power supply having a power supply voltage lower than that of the first power supply, an impedance of the first connection element is reduced when the potential of the termination node is lower than a first potential higher than the power supply voltage of the second power supply, and an impedance of the second connection element is reduced when the potential of the termination node is higher than a second potential which is lower than the power supply voltage of the first power supply and which is higher than the first potential, wherein the termination circuit includes: a first NMOS transistor serving as the first connection element, and having a drain connected to the first power supply, and a source connected to the termination node; and a control potential generating circuit configured to generate a control potential which is to be given to a gate of the first NMOS transistor, wherein the control potential generating circuit includes: a bias circuit configured to generate and output the first potential; a second NMOS transistor having a drain connected to the first power supply; and a first load circuit having one end connected to a source of the second NMOS transistor, and the other end connected to the second power supply, and wherein the control potential generating circuit controls a gate potential of the second NMOS transistor such that a source potential of the second NMOS transistor is equal to the first potential output from the bias circuit, and outputs the gate potential of the second NMOS transistor as the control potential.