Patent ID: 7576574

Claim:
A constant current generator, comprising: a first transistor that is a MOS transistor configured to supply current in accordance with a control signal input to an input terminal of the transistor; a second transistor that is a MOS transistor having an equal impurity type to the first transistor and configured to supply current to the load in accordance with the control signal, and a gate and a source of the second transistor are connected to a gate and a source of the first transistor, respectively; a voltage adjustor configured to adjust a drain voltage of the first transistor in accordance with a drain voltage of the second transistor; a constant current generation circuit including a first current source to supply a first current to the first transistor through the voltage adjustor; and a level shifter configured to shift a voltage at a connection node of the voltage adjustor and the constant current generation circuit and to output a shifted voltage to each gate of the first and second transistors.