Semiconductor device having plural power source voltage generators, and voltage supplying method

A semiconductor device comprising:

• a reference voltage supply circuit configured to supply a first reference voltage and a second reference voltage;
• a power source voltage supply circuit including a first power source voltage generator supplied with the first reference voltage and configured to generate a first power source voltage, and a second power source voltage generator supplied with the second reference voltage and configured to generate a second power source voltage, the power source voltage supply circuit being configured to supply the first power source voltage and the second power source voltage to a power source voltage line;
• and
• a voltage control circuit connected to the power source voltage line, and configured to control a value of the first reference voltage and a value of the second reference voltage,
• wherein:
• the reference voltage supply circuit includes a first variable resistor configured to change the value of the first reference voltage, and a second variable resistor configured to change the value of the second reference voltage,
• the first variable resistor is provided between a first node and a second node,
• the second variable resistor is provided between the second node and a third node, and
• the reference voltage supply circuit supplies the first reference voltage from the first node to the first power source voltage generator, and supplies the second reference voltage from the second node to the second power source voltage generator.