| 摘要 |
Offset canceling amplifier circuit in which a high accuracy of output with a suppressed output offset is achieved and a variation in a slew rate is also suppressed, and a display device having the amplifier circuit. A first differential pair (M 5, M 6 ) connected between a first current source (M 9 ) and a common load circuit (M 1, M 2 ) and a second differential pair (M 3, M 4 ) connected between a second current source (M 8 ) between the common load circuit (M 1, M 2 ) are provided. A switch (SW 1 ) connected between one input of the first differential pair (M 5, M 6 ) and an input terminal ( 1 ), a switch (SW 2 ) connected between the one input of the differential pair (M 5, M 6 ) and an output terminal ( 2 ), a switch (SW 3 ) connected between one input of the second differential pair (M 3, M 4 ) and the output terminal ( 2 ), and a capacitance element (C 1 ) connected to the one input of the second differential pair (M 3, M 4 ) are provided. The other input of the first differential pair (M 5, M 6 ) is connected to the input terminal ( 1 ), and the other input of the second differential pair (M 3, M 4 ) is connected to a reference voltage input terminal ( 3 ). An amplifying operation by an amplifying element (M 7 ) is performed responsive to a common output signal of the two differential pairs, and circuits (SW 11, SW 12 ) for controlling activation or deactivation of at least one of the first and second current sources are provided.
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