Patent ID: 7208999
Filing Date: 2007-04-24
Classification: G05F,G11C,H03F

Abstract:
1. A semiconductor integrated circuit device, comprising: a first power terminal which receives a first power supply voltage; a ground terminal which receives a ground potential; a voltage generating circuit which forms an internal power supply voltage which is lower than the first power supply voltage; and an internal circuit provided with the internal power supply voltage as a power supply, wherein the voltage generating circuit includes a differential amplifier circuit having a first input terminal supplied with a reference voltage, an output MOSFET which outputs the internal power supply voltage based on an output signal from the differential amplifier circuit, and a second input terminal which is supplied with the internal power supply voltage, wherein the differential amplifier circuit is provided with a first MOSFET having a gate connected to the first input terminal, a second MOSFET which has a gate connected to the second input terminal and a source commonly connected to a source of the first MOSFET, and a current source connected between common sources of the first and second MOSFETs and the ground terminal, wherein the current source includes third and fourth MOSFETs parallel-connected between the common sources and the ground terminal, wherein when the first power supply voltage remains higher than the reference voltage while a difference between the first power supply voltage and the reference voltage becomes large, a source-drain current of the third MOSFET is controlled so as to increase, and wherein when the difference between the first power supply voltage and the reference voltage becomes small, a source-drain current of the fourth MOSFET is controlled so as to increase.