Patent ID: 8358556
Filing Date: 2013-01-22
Classification: G05F,G11C,H02J

Abstract:
1. A semiconductor device comprising: an internal circuit supplied with a power supply voltage; an internal power supply wiring connected to the internal circuit; a plurality of power supply units connected in common to the internal power supply wiring to supply the internal circuit with the power supply voltage via the internal power supply wiring; a control circuit that activates or deactivates each of the power supply units, wherein each of the power supply units includes a driver transistor connected between an external power supply wiring to which an external voltage is supplied and the internal power supply wiring, and the control circuit activates or deactivates each of the power supply unit by turning on or off the driver transistors included therein, and wherein sizes of the driver transistors included in the power supply units are different from each other; and an operational amplifier including two input terminals that receives the power supply voltage from the internal power supply wiring and a reference potential of the power supply voltage, respectively, wherein each of the power supply units further includes a first switch element provided between a control electrode of the driver transistor included therein and an output terminal of the operational amplifier, and the control circuit activates or deactivates each of the power supply units by turning on or off the first switch element thereof.