Amplifier circuit and display device

Amplifiers – With periodic switching input-output

Reexamination Certificate

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C330S253000

Reexamination Certificate

active

07339422

ABSTRACT:
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 (M5,M6) connected between a first current source (M9) and a common load circuit (M1,M2) and a second differential pair (M3,M4) connected between a second current source (M8) between the common load circuit (M1,M2) are provided. A switch (SW1) connected between one input of the first differential pair (M5,M6) and an input terminal (1), a switch (SW2) connected between the one input of the differential pair (M5,M6) and an output terminal (2), a switch (SW3) connected between one input of the second differential pair (M3,M4) and the output terminal (2), and a capacitance element (C1) connected to the one input of the second differential pair (M3,M4) are provided. The other input of the first differential pair (M5,M6) is connected to the input terminal (1), and the other input of the second differential pair (M3,M4) is connected to a reference voltage input terminal (3). An amplifying operation by an amplifying element (M7) is performed responsive to a common output signal of the two differential pairs, and circuits (SW11,SW12) for controlling activation or deactivation of at least one of the first and second current sources are provided.

REFERENCES:
patent: 4001603 (1977-01-01), Wilcox
patent: 4820998 (1989-04-01), Roessler et al.
patent: 5854574 (1998-12-01), Singer et al.
patent: 6411240 (2002-06-01), Greitschus
patent: 6426674 (2002-07-01), Davidescu
patent: 6515518 (2003-02-01), Minegishi
patent: A-2001-292041 (2001-10-01), None
patent: A-2003-168936 (2003-06-01), None

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