Differential amplifier, method for amplifying signals of differential amplifier, and display driving device having differential amplifier

摘要

A differential amplifier includes input, output, current summing, and switch circuits. The input circuit generates first and second differential currents in response to a voltage difference between differential input signals. The output circuit includes a first and second transistors connected between a first voltage rail and output port and the output port and second voltage rail, respectively. The current summing circuit includes a first control node outputting a first control voltage to control a current in the first transistor and a second control node outputting a second control voltage to control a current in the second transistor, in response to the first and second differential currents, respectively. The switch circuit connects the first transistor gate to one of the first control node and the first voltage rail and the second transistor gate to one of the second control node and the second voltage rail, in response to a control signal.