Patent ID: 6806743
Filing Date: 2004-10-19
Classification: H03F

Abstract:
A semiconductor integrated circuit device, comprising:a first amplifying unit including a first differential MOSFET pair of first conductivity type whose gates are respectively connected to a pair of first input terminals, and a first current source MOSFET of first conductivity type which is provided at common sources of the first differential MOSFET pair and forms an operating current for the first differential MOSFET pair; a second amplifying unit including a second differential MOSFET pair of second conductivity type whose gates are respectively connected to the pair of first input terminals, and a second current source MOSFET of second conductivity type which is provided at common sources of the second differential MOSFET pair and forms an operating current for the second differential MOSFET pair; a first circuit including a circuit having a first MOSFET pair of second conductivity type connected to a source-drain path of the first differential MOSFET pair, and a second MOSFET pair of first conductivity type connected to a source-drain path of the second differential MOSFET pair; a third amplifying unit including a third differential MOSFET pair of first conductivity type whose gates are respectively connected to a pair of second input terminals, and a third current source MOSFET of first conductivity type which is provided at common sources of the third differential MOSFET pair and forms an operating current for the third differential MOSFET pair; a fourth amplifying unit including a fourth differential MOSFET pair of second conductivity type whose gates are respectively connected to the pair of second input terminals, and a fourth current source MOSFET of second conductivity type which is provided at common sources of the fourth differential MOSFET pair and forms an operating current for the fourth differential MOSFET pair; and a second circuit including a circuit having a third MOSFET pair of second conductivity type connected to a source-drain path of the third differential MOSFET pair, and a circuit having a fourth MOSFET pair of first conductivity type connected to a source-drain path of the fourth differential MOSFET pair, wherein an output produced from the second circuit is supplied to the gates of the first through fourth current source MOSFETs and the gates of the first through fourth MOSFET pairs.