DIFFERENTIAL AMPLIFIER, METHOD FOR AMPLIFYING SIGNALS, AND DISPLAY DRIVING DEVICE HAVING THE SAME

摘要

A differential amplifier, a method for amplifying signals, and a display driving device including the same are provided to reduce layout area and power consumption by an output circuit by manufacturing the output circuit along with a transistor instead of an operational amplifier. An input circuit(100) generates first differential currents and second differential currents according to a voltage difference between differential input signals. An output circuit(140) comprises a first transistor and a second transistor. The first transistor is connected between a first voltage rail and an output terminal. The second transistor is connected between the output terminal and a second voltage rail. A current summing circuit(120) includes a first control node and a second control node. The first control node controls a current flowing in the first transistor according to the first differential currents. The second control node controls a current flowing in the second transistor according to the second differential currents. A switching circuit(130) connects a gate of the first transistor to one among the first control node and the first voltage rail according to the control signal, and connects a gate of the second transistor to one among the second control node and the second voltage rail according to the control signal.